d/freebsd-nq
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
26066a530f
freebsd-nq/sys/amd64/vmm/intel/vmx.c
Neel Natu d087a39935 Simplify instruction restart logic in bhyve. 
Keep track of the next instruction to be executed by the vcpu as 'nextrip'.
As a result the VM_RUN ioctl no longer takes the %rip where a vcpu should
start execution.

Also, instruction restart happens implicitly via 'vm_inject_exception()' or
explicitly via 'vm_restart_instruction()'. The APIs behave identically in
both kernel and userspace contexts. The main beneficiary is the instruction
emulation code that executes in both contexts.

bhyve(8) VM exit handlers now treat 'vmexit->rip' and 'vmexit->inst_length'
as readonly:
- Restarting an instruction is now done by calling 'vm_restart_instruction()'
  as opposed to setting 'vmexit->inst_length' to 0 (e.g. emulate_inout())
- Resuming vcpu at an arbitrary %rip is now done by setting VM_REG_GUEST_RIP
  as opposed to changing 'vmexit->rip' (e.g. vmexit_task_switch())

Differential Revision:	https://reviews.freebsd.org/D1526
Reviewed by:		grehan
MFC after:		2 weeks
2015-01-18 03:08:30 +00:00

3419 lines
89 KiB
C
Raw Blame History

/*-
* Copyright (c) 2011 NetApp, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* $FreeBSD$
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/smp.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/pcpu.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/psl.h>
#include <machine/cpufunc.h>
#include <machine/md_var.h>
#include <machine/segments.h>
#include <machine/smp.h>
#include <machine/specialreg.h>
#include <machine/vmparam.h>
#include <machine/vmm.h>
#include <machine/vmm_dev.h>
#include <machine/vmm_instruction_emul.h>
#include "vmm_lapic.h"
#include "vmm_host.h"
#include "vmm_ioport.h"
#include "vmm_ipi.h"
#include "vmm_ktr.h"
#include "vmm_stat.h"
#include "vatpic.h"
#include "vlapic.h"
#include "vlapic_priv.h"
#include "ept.h"
#include "vmx_cpufunc.h"
#include "vmx.h"
#include "vmx_msr.h"
#include "x86.h"
#include "vmx_controls.h"
#define PINBASED_CTLS_ONE_SETTING \
(PINBASED_EXTINT_EXITING | \
PINBASED_NMI_EXITING | \
PINBASED_VIRTUAL_NMI)
#define PINBASED_CTLS_ZERO_SETTING 0
#define PROCBASED_CTLS_WINDOW_SETTING \
(PROCBASED_INT_WINDOW_EXITING | \
PROCBASED_NMI_WINDOW_EXITING)
#define PROCBASED_CTLS_ONE_SETTING \
(PROCBASED_SECONDARY_CONTROLS | \
PROCBASED_MWAIT_EXITING | \
PROCBASED_MONITOR_EXITING | \
PROCBASED_IO_EXITING | \
PROCBASED_MSR_BITMAPS | \
PROCBASED_CTLS_WINDOW_SETTING | \
PROCBASED_CR8_LOAD_EXITING | \
PROCBASED_CR8_STORE_EXITING)
#define PROCBASED_CTLS_ZERO_SETTING \
(PROCBASED_CR3_LOAD_EXITING | \
PROCBASED_CR3_STORE_EXITING | \
PROCBASED_IO_BITMAPS)
#define PROCBASED_CTLS2_ONE_SETTING PROCBASED2_ENABLE_EPT
#define PROCBASED_CTLS2_ZERO_SETTING 0
#define VM_EXIT_CTLS_ONE_SETTING \
(VM_EXIT_HOST_LMA | \
VM_EXIT_SAVE_EFER | \
VM_EXIT_LOAD_EFER | \
VM_EXIT_ACKNOWLEDGE_INTERRUPT | \
VM_EXIT_SAVE_PAT | \
VM_EXIT_LOAD_PAT)
#define VM_EXIT_CTLS_ZERO_SETTING VM_EXIT_SAVE_DEBUG_CONTROLS
#define VM_ENTRY_CTLS_ONE_SETTING (VM_ENTRY_LOAD_EFER | VM_ENTRY_LOAD_PAT)
#define VM_ENTRY_CTLS_ZERO_SETTING \
(VM_ENTRY_LOAD_DEBUG_CONTROLS | \
VM_ENTRY_INTO_SMM | \
VM_ENTRY_DEACTIVATE_DUAL_MONITOR)
#define HANDLED 1
#define UNHANDLED 0
static MALLOC_DEFINE(M_VMX, "vmx", "vmx");
static MALLOC_DEFINE(M_VLAPIC, "vlapic", "vlapic");
SYSCTL_DECL(_hw_vmm);
SYSCTL_NODE(_hw_vmm, OID_AUTO, vmx, CTLFLAG_RW, NULL, NULL);
int vmxon_enabled[MAXCPU];
static char vmxon_region[MAXCPU][PAGE_SIZE] __aligned(PAGE_SIZE);
static uint32_t pinbased_ctls, procbased_ctls, procbased_ctls2;
static uint32_t exit_ctls, entry_ctls;
static uint64_t cr0_ones_mask, cr0_zeros_mask;
SYSCTL_ULONG(_hw_vmm_vmx, OID_AUTO, cr0_ones_mask, CTLFLAG_RD,
&cr0_ones_mask, 0, NULL);
SYSCTL_ULONG(_hw_vmm_vmx, OID_AUTO, cr0_zeros_mask, CTLFLAG_RD,
&cr0_zeros_mask, 0, NULL);
static uint64_t cr4_ones_mask, cr4_zeros_mask;
SYSCTL_ULONG(_hw_vmm_vmx, OID_AUTO, cr4_ones_mask, CTLFLAG_RD,
&cr4_ones_mask, 0, NULL);
SYSCTL_ULONG(_hw_vmm_vmx, OID_AUTO, cr4_zeros_mask, CTLFLAG_RD,
&cr4_zeros_mask, 0, NULL);
static int vmx_initialized;
SYSCTL_INT(_hw_vmm_vmx, OID_AUTO, initialized, CTLFLAG_RD,
&vmx_initialized, 0, "Intel VMX initialized");
/*
* Optional capabilities
*/
static SYSCTL_NODE(_hw_vmm_vmx, OID_AUTO, cap, CTLFLAG_RW, NULL, NULL);
static int cap_halt_exit;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, halt_exit, CTLFLAG_RD, &cap_halt_exit, 0,
"HLT triggers a VM-exit");
static int cap_pause_exit;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, pause_exit, CTLFLAG_RD, &cap_pause_exit,
0, "PAUSE triggers a VM-exit");
static int cap_unrestricted_guest;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, unrestricted_guest, CTLFLAG_RD,
&cap_unrestricted_guest, 0, "Unrestricted guests");
static int cap_monitor_trap;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, monitor_trap, CTLFLAG_RD,
&cap_monitor_trap, 0, "Monitor trap flag");
static int cap_invpcid;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, invpcid, CTLFLAG_RD, &cap_invpcid,
0, "Guests are allowed to use INVPCID");
static int virtual_interrupt_delivery;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, virtual_interrupt_delivery, CTLFLAG_RD,
&virtual_interrupt_delivery, 0, "APICv virtual interrupt delivery support");
static int posted_interrupts;
SYSCTL_INT(_hw_vmm_vmx_cap, OID_AUTO, posted_interrupts, CTLFLAG_RD,
&posted_interrupts, 0, "APICv posted interrupt support");
static int pirvec;
SYSCTL_INT(_hw_vmm_vmx, OID_AUTO, posted_interrupt_vector, CTLFLAG_RD,
&pirvec, 0, "APICv posted interrupt vector");
static struct unrhdr *vpid_unr;
static u_int vpid_alloc_failed;
SYSCTL_UINT(_hw_vmm_vmx, OID_AUTO, vpid_alloc_failed, CTLFLAG_RD,
&vpid_alloc_failed, 0, NULL);
/*
* Use the last page below 4GB as the APIC access address. This address is
* occupied by the boot firmware so it is guaranteed that it will not conflict
* with a page in system memory.
*/
#define APIC_ACCESS_ADDRESS 0xFFFFF000
static int vmx_getdesc(void *arg, int vcpu, int reg, struct seg_desc *desc);
static int vmx_getreg(void *arg, int vcpu, int reg, uint64_t *retval);
static int vmxctx_setreg(struct vmxctx *vmxctx, int reg, uint64_t val);
static void vmx_inject_pir(struct vlapic *vlapic);
#ifdef KTR
static const char *
exit_reason_to_str(int reason)
{
static char reasonbuf[32];
switch (reason) {
case EXIT_REASON_EXCEPTION:
return "exception";
case EXIT_REASON_EXT_INTR:
return "extint";
case EXIT_REASON_TRIPLE_FAULT:
return "triplefault";
case EXIT_REASON_INIT:
return "init";
case EXIT_REASON_SIPI:
return "sipi";
case EXIT_REASON_IO_SMI:
return "iosmi";
case EXIT_REASON_SMI:
return "smi";
case EXIT_REASON_INTR_WINDOW:
return "intrwindow";
case EXIT_REASON_NMI_WINDOW:
return "nmiwindow";
case EXIT_REASON_TASK_SWITCH:
return "taskswitch";
case EXIT_REASON_CPUID:
return "cpuid";
case EXIT_REASON_GETSEC:
return "getsec";
case EXIT_REASON_HLT:
return "hlt";
case EXIT_REASON_INVD:
return "invd";
case EXIT_REASON_INVLPG:
return "invlpg";
case EXIT_REASON_RDPMC:
return "rdpmc";
case EXIT_REASON_RDTSC:
return "rdtsc";
case EXIT_REASON_RSM:
return "rsm";
case EXIT_REASON_VMCALL:
return "vmcall";
case EXIT_REASON_VMCLEAR:
return "vmclear";
case EXIT_REASON_VMLAUNCH:
return "vmlaunch";
case EXIT_REASON_VMPTRLD:
return "vmptrld";
case EXIT_REASON_VMPTRST:
return "vmptrst";
case EXIT_REASON_VMREAD:
return "vmread";
case EXIT_REASON_VMRESUME:
return "vmresume";
case EXIT_REASON_VMWRITE:
return "vmwrite";
case EXIT_REASON_VMXOFF:
return "vmxoff";
case EXIT_REASON_VMXON:
return "vmxon";
case EXIT_REASON_CR_ACCESS:
return "craccess";
case EXIT_REASON_DR_ACCESS:
return "draccess";
case EXIT_REASON_INOUT:
return "inout";
case EXIT_REASON_RDMSR:
return "rdmsr";
case EXIT_REASON_WRMSR:
return "wrmsr";
case EXIT_REASON_INVAL_VMCS:
return "invalvmcs";
case EXIT_REASON_INVAL_MSR:
return "invalmsr";
case EXIT_REASON_MWAIT:
return "mwait";
case EXIT_REASON_MTF:
return "mtf";
case EXIT_REASON_MONITOR:
return "monitor";
case EXIT_REASON_PAUSE:
return "pause";
case EXIT_REASON_MCE_DURING_ENTRY:
return "mce-during-entry";
case EXIT_REASON_TPR:
return "tpr";
case EXIT_REASON_APIC_ACCESS:
return "apic-access";
case EXIT_REASON_GDTR_IDTR:
return "gdtridtr";
case EXIT_REASON_LDTR_TR:
return "ldtrtr";
case EXIT_REASON_EPT_FAULT:
return "eptfault";
case EXIT_REASON_EPT_MISCONFIG:
return "eptmisconfig";
case EXIT_REASON_INVEPT:
return "invept";
case EXIT_REASON_RDTSCP:
return "rdtscp";
case EXIT_REASON_VMX_PREEMPT:
return "vmxpreempt";
case EXIT_REASON_INVVPID:
return "invvpid";
case EXIT_REASON_WBINVD:
return "wbinvd";
case EXIT_REASON_XSETBV:
return "xsetbv";
case EXIT_REASON_APIC_WRITE:
return "apic-write";
default:
snprintf(reasonbuf, sizeof(reasonbuf), "%d", reason);
return (reasonbuf);
}
}
#endif /* KTR */
static int
vmx_allow_x2apic_msrs(struct vmx *vmx)
{
int i, error;
error = 0;
/*
* Allow readonly access to the following x2APIC MSRs from the guest.
*/
error += guest_msr_ro(vmx, MSR_APIC_ID);
error += guest_msr_ro(vmx, MSR_APIC_VERSION);
error += guest_msr_ro(vmx, MSR_APIC_LDR);
error += guest_msr_ro(vmx, MSR_APIC_SVR);
for (i = 0; i < 8; i++)
error += guest_msr_ro(vmx, MSR_APIC_ISR0 + i);
for (i = 0; i < 8; i++)
error += guest_msr_ro(vmx, MSR_APIC_TMR0 + i);
for (i = 0; i < 8; i++)
error += guest_msr_ro(vmx, MSR_APIC_IRR0 + i);
error += guest_msr_ro(vmx, MSR_APIC_ESR);
error += guest_msr_ro(vmx, MSR_APIC_LVT_TIMER);
error += guest_msr_ro(vmx, MSR_APIC_LVT_THERMAL);
error += guest_msr_ro(vmx, MSR_APIC_LVT_PCINT);
error += guest_msr_ro(vmx, MSR_APIC_LVT_LINT0);
error += guest_msr_ro(vmx, MSR_APIC_LVT_LINT1);
error += guest_msr_ro(vmx, MSR_APIC_LVT_ERROR);
error += guest_msr_ro(vmx, MSR_APIC_ICR_TIMER);
error += guest_msr_ro(vmx, MSR_APIC_DCR_TIMER);
error += guest_msr_ro(vmx, MSR_APIC_ICR);
/*
* Allow TPR, EOI and SELF_IPI MSRs to be read and written by the guest.
*
* These registers get special treatment described in the section
* "Virtualizing MSR-Based APIC Accesses".
*/
error += guest_msr_rw(vmx, MSR_APIC_TPR);
error += guest_msr_rw(vmx, MSR_APIC_EOI);
error += guest_msr_rw(vmx, MSR_APIC_SELF_IPI);
return (error);
}
u_long
vmx_fix_cr0(u_long cr0)
{
return ((cr0 | cr0_ones_mask) & ~cr0_zeros_mask);
}
u_long
vmx_fix_cr4(u_long cr4)
{
return ((cr4 | cr4_ones_mask) & ~cr4_zeros_mask);
}
static void
vpid_free(int vpid)
{
if (vpid < 0 || vpid > 0xffff)
panic("vpid_free: invalid vpid %d", vpid);
/*
* VPIDs [0,VM_MAXCPU] are special and are not allocated from
* the unit number allocator.
*/
if (vpid > VM_MAXCPU)
free_unr(vpid_unr, vpid);
}
static void
vpid_alloc(uint16_t *vpid, int num)
{
int i, x;
if (num <= 0 || num > VM_MAXCPU)
panic("invalid number of vpids requested: %d", num);
/*
* If the "enable vpid" execution control is not enabled then the
* VPID is required to be 0 for all vcpus.
*/
if ((procbased_ctls2 & PROCBASED2_ENABLE_VPID) == 0) {
for (i = 0; i < num; i++)
vpid[i] = 0;
return;
}
/*
* Allocate a unique VPID for each vcpu from the unit number allocator.
*/
for (i = 0; i < num; i++) {
x = alloc_unr(vpid_unr);
if (x == -1)
break;
else
vpid[i] = x;
}
if (i < num) {
atomic_add_int(&vpid_alloc_failed, 1);
/*
* If the unit number allocator does not have enough unique
* VPIDs then we need to allocate from the [1,VM_MAXCPU] range.
*
* These VPIDs are not be unique across VMs but this does not
* affect correctness because the combined mappings are also
* tagged with the EP4TA which is unique for each VM.
*
* It is still sub-optimal because the invvpid will invalidate
* combined mappings for a particular VPID across all EP4TAs.
*/
while (i-- > 0)
vpid_free(vpid[i]);
for (i = 0; i < num; i++)
vpid[i] = i + 1;
}
}
static void
vpid_init(void)
{
/*
* VPID 0 is required when the "enable VPID" execution control is
* disabled.
*
* VPIDs [1,VM_MAXCPU] are used as the "overflow namespace" when the
* unit number allocator does not have sufficient unique VPIDs to
* satisfy the allocation.
*
* The remaining VPIDs are managed by the unit number allocator.
*/
vpid_unr = new_unrhdr(VM_MAXCPU + 1, 0xffff, NULL);
}
static void
vmx_disable(void *arg __unused)
{
struct invvpid_desc invvpid_desc = { 0 };
struct invept_desc invept_desc = { 0 };
if (vmxon_enabled[curcpu]) {
/*
* See sections 25.3.3.3 and 25.3.3.4 in Intel Vol 3b.
*
* VMXON or VMXOFF are not required to invalidate any TLB
* caching structures. This prevents potential retention of
* cached information in the TLB between distinct VMX episodes.
*/
invvpid(INVVPID_TYPE_ALL_CONTEXTS, invvpid_desc);
invept(INVEPT_TYPE_ALL_CONTEXTS, invept_desc);
vmxoff();
}
load_cr4(rcr4() & ~CR4_VMXE);
}
static int
vmx_cleanup(void)
{
if (pirvec != 0)
vmm_ipi_free(pirvec);
if (vpid_unr != NULL) {
delete_unrhdr(vpid_unr);
vpid_unr = NULL;
}
smp_rendezvous(NULL, vmx_disable, NULL, NULL);
return (0);
}
static void
vmx_enable(void *arg __unused)
{
int error;
uint64_t feature_control;
feature_control = rdmsr(MSR_IA32_FEATURE_CONTROL);
if ((feature_control & IA32_FEATURE_CONTROL_LOCK) == 0 ||
(feature_control & IA32_FEATURE_CONTROL_VMX_EN) == 0) {
wrmsr(MSR_IA32_FEATURE_CONTROL,
feature_control | IA32_FEATURE_CONTROL_VMX_EN |
IA32_FEATURE_CONTROL_LOCK);
}
load_cr4(rcr4() | CR4_VMXE);
*(uint32_t *)vmxon_region[curcpu] = vmx_revision();
error = vmxon(vmxon_region[curcpu]);
if (error == 0)
vmxon_enabled[curcpu] = 1;
}
static void
vmx_restore(void)
{
if (vmxon_enabled[curcpu])
vmxon(vmxon_region[curcpu]);
}
static int
vmx_init(int ipinum)
{
int error, use_tpr_shadow;
uint64_t basic, fixed0, fixed1, feature_control;
uint32_t tmp, procbased2_vid_bits;
/* CPUID.1:ECX[bit 5] must be 1 for processor to support VMX */
if (!(cpu_feature2 & CPUID2_VMX)) {
printf("vmx_init: processor does not support VMX operation\n");
return (ENXIO);
}
/*
* Verify that MSR_IA32_FEATURE_CONTROL lock and VMXON enable bits
* are set (bits 0 and 2 respectively).
*/
feature_control = rdmsr(MSR_IA32_FEATURE_CONTROL);
if ((feature_control & IA32_FEATURE_CONTROL_LOCK) == 1 &&
(feature_control & IA32_FEATURE_CONTROL_VMX_EN) == 0) {
printf("vmx_init: VMX operation disabled by BIOS\n");
return (ENXIO);
}
/*
* Verify capabilities MSR_VMX_BASIC:
* - bit 54 indicates support for INS/OUTS decoding
*/
basic = rdmsr(MSR_VMX_BASIC);
if ((basic & (1UL << 54)) == 0) {
printf("vmx_init: processor does not support desired basic "
"capabilities\n");
return (EINVAL);
}
/* Check support for primary processor-based VM-execution controls */
error = vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS,
MSR_VMX_TRUE_PROCBASED_CTLS,
PROCBASED_CTLS_ONE_SETTING,
PROCBASED_CTLS_ZERO_SETTING, &procbased_ctls);
if (error) {
printf("vmx_init: processor does not support desired primary "
"processor-based controls\n");
return (error);
}
/* Clear the processor-based ctl bits that are set on demand */
procbased_ctls &= ~PROCBASED_CTLS_WINDOW_SETTING;
/* Check support for secondary processor-based VM-execution controls */
error = vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS2,
MSR_VMX_PROCBASED_CTLS2,
PROCBASED_CTLS2_ONE_SETTING,
PROCBASED_CTLS2_ZERO_SETTING, &procbased_ctls2);
if (error) {
printf("vmx_init: processor does not support desired secondary "
"processor-based controls\n");
return (error);
}
/* Check support for VPID */
error = vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS2, MSR_VMX_PROCBASED_CTLS2,
PROCBASED2_ENABLE_VPID, 0, &tmp);
if (error == 0)
procbased_ctls2 |= PROCBASED2_ENABLE_VPID;
/* Check support for pin-based VM-execution controls */
error = vmx_set_ctlreg(MSR_VMX_PINBASED_CTLS,
MSR_VMX_TRUE_PINBASED_CTLS,
PINBASED_CTLS_ONE_SETTING,
PINBASED_CTLS_ZERO_SETTING, &pinbased_ctls);
if (error) {
printf("vmx_init: processor does not support desired "
"pin-based controls\n");
return (error);
}
/* Check support for VM-exit controls */
error = vmx_set_ctlreg(MSR_VMX_EXIT_CTLS, MSR_VMX_TRUE_EXIT_CTLS,
VM_EXIT_CTLS_ONE_SETTING,
VM_EXIT_CTLS_ZERO_SETTING,
&exit_ctls);
if (error) {
printf("vmx_init: processor does not support desired "
"exit controls\n");
return (error);
}
/* Check support for VM-entry controls */
error = vmx_set_ctlreg(MSR_VMX_ENTRY_CTLS, MSR_VMX_TRUE_ENTRY_CTLS,
VM_ENTRY_CTLS_ONE_SETTING, VM_ENTRY_CTLS_ZERO_SETTING,
&entry_ctls);
if (error) {
printf("vmx_init: processor does not support desired "
"entry controls\n");
return (error);
}
/*
* Check support for optional features by testing them
* as individual bits
*/
cap_halt_exit = (vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS,
MSR_VMX_TRUE_PROCBASED_CTLS,
PROCBASED_HLT_EXITING, 0,
&tmp) == 0);
cap_monitor_trap = (vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS,
MSR_VMX_PROCBASED_CTLS,
PROCBASED_MTF, 0,
&tmp) == 0);
cap_pause_exit = (vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS,
MSR_VMX_TRUE_PROCBASED_CTLS,
PROCBASED_PAUSE_EXITING, 0,
&tmp) == 0);
cap_unrestricted_guest = (vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS2,
MSR_VMX_PROCBASED_CTLS2,
PROCBASED2_UNRESTRICTED_GUEST, 0,
&tmp) == 0);
cap_invpcid = (vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS2,
MSR_VMX_PROCBASED_CTLS2, PROCBASED2_ENABLE_INVPCID, 0,
&tmp) == 0);
/*
* Check support for virtual interrupt delivery.
*/
procbased2_vid_bits = (PROCBASED2_VIRTUALIZE_APIC_ACCESSES |
PROCBASED2_VIRTUALIZE_X2APIC_MODE |
PROCBASED2_APIC_REGISTER_VIRTUALIZATION |
PROCBASED2_VIRTUAL_INTERRUPT_DELIVERY);
use_tpr_shadow = (vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS,
MSR_VMX_TRUE_PROCBASED_CTLS, PROCBASED_USE_TPR_SHADOW, 0,
&tmp) == 0);
error = vmx_set_ctlreg(MSR_VMX_PROCBASED_CTLS2, MSR_VMX_PROCBASED_CTLS2,
procbased2_vid_bits, 0, &tmp);
if (error == 0 && use_tpr_shadow) {
virtual_interrupt_delivery = 1;
TUNABLE_INT_FETCH("hw.vmm.vmx.use_apic_vid",
&virtual_interrupt_delivery);
}
if (virtual_interrupt_delivery) {
procbased_ctls |= PROCBASED_USE_TPR_SHADOW;
procbased_ctls2 |= procbased2_vid_bits;
procbased_ctls2 &= ~PROCBASED2_VIRTUALIZE_X2APIC_MODE;
/*
* No need to emulate accesses to %CR8 if virtual
* interrupt delivery is enabled.
*/
procbased_ctls &= ~PROCBASED_CR8_LOAD_EXITING;
procbased_ctls &= ~PROCBASED_CR8_STORE_EXITING;
/*
* Check for Posted Interrupts only if Virtual Interrupt
* Delivery is enabled.
*/
error = vmx_set_ctlreg(MSR_VMX_PINBASED_CTLS,
MSR_VMX_TRUE_PINBASED_CTLS, PINBASED_POSTED_INTERRUPT, 0,
&tmp);
if (error == 0) {
pirvec = vmm_ipi_alloc();
if (pirvec == 0) {
if (bootverbose) {
printf("vmx_init: unable to allocate "
"posted interrupt vector\n");
}
} else {
posted_interrupts = 1;
TUNABLE_INT_FETCH("hw.vmm.vmx.use_apic_pir",
&posted_interrupts);
}
}
}
if (posted_interrupts)
pinbased_ctls |= PINBASED_POSTED_INTERRUPT;
/* Initialize EPT */
error = ept_init(ipinum);
if (error) {
printf("vmx_init: ept initialization failed (%d)\n", error);
return (error);
}
/*
* Stash the cr0 and cr4 bits that must be fixed to 0 or 1
*/
fixed0 = rdmsr(MSR_VMX_CR0_FIXED0);
fixed1 = rdmsr(MSR_VMX_CR0_FIXED1);
cr0_ones_mask = fixed0 & fixed1;
cr0_zeros_mask = ~fixed0 & ~fixed1;
/*
* CR0_PE and CR0_PG can be set to zero in VMX non-root operation
* if unrestricted guest execution is allowed.
*/
if (cap_unrestricted_guest)
cr0_ones_mask &= ~(CR0_PG | CR0_PE);
/*
* Do not allow the guest to set CR0_NW or CR0_CD.
*/
cr0_zeros_mask |= (CR0_NW | CR0_CD);
fixed0 = rdmsr(MSR_VMX_CR4_FIXED0);
fixed1 = rdmsr(MSR_VMX_CR4_FIXED1);
cr4_ones_mask = fixed0 & fixed1;
cr4_zeros_mask = ~fixed0 & ~fixed1;
vpid_init();
vmx_msr_init();
/* enable VMX operation */
smp_rendezvous(NULL, vmx_enable, NULL, NULL);
vmx_initialized = 1;
return (0);
}
static void
vmx_trigger_hostintr(int vector)
{
uintptr_t func;
struct gate_descriptor *gd;
gd = &idt[vector];
KASSERT(vector >= 32 && vector <= 255, ("vmx_trigger_hostintr: "
"invalid vector %d", vector));
KASSERT(gd->gd_p == 1, ("gate descriptor for vector %d not present",
vector));
KASSERT(gd->gd_type == SDT_SYSIGT, ("gate descriptor for vector %d "
"has invalid type %d", vector, gd->gd_type));
KASSERT(gd->gd_dpl == SEL_KPL, ("gate descriptor for vector %d "
"has invalid dpl %d", vector, gd->gd_dpl));
KASSERT(gd->gd_selector == GSEL(GCODE_SEL, SEL_KPL), ("gate descriptor "
"for vector %d has invalid selector %d", vector, gd->gd_selector));
KASSERT(gd->gd_ist == 0, ("gate descriptor for vector %d has invalid "
"IST %d", vector, gd->gd_ist));
func = ((long)gd->gd_hioffset << 16 | gd->gd_looffset);
vmx_call_isr(func);
}
static int
vmx_setup_cr_shadow(int which, struct vmcs *vmcs, uint32_t initial)
{
int error, mask_ident, shadow_ident;
uint64_t mask_value;
if (which != 0 && which != 4)
panic("vmx_setup_cr_shadow: unknown cr%d", which);
if (which == 0) {
mask_ident = VMCS_CR0_MASK;
mask_value = cr0_ones_mask | cr0_zeros_mask;
shadow_ident = VMCS_CR0_SHADOW;
} else {
mask_ident = VMCS_CR4_MASK;
mask_value = cr4_ones_mask | cr4_zeros_mask;
shadow_ident = VMCS_CR4_SHADOW;
}
error = vmcs_setreg(vmcs, 0, VMCS_IDENT(mask_ident), mask_value);
if (error)
return (error);
error = vmcs_setreg(vmcs, 0, VMCS_IDENT(shadow_ident), initial);
if (error)
return (error);
return (0);
}
#define vmx_setup_cr0_shadow(vmcs,init) vmx_setup_cr_shadow(0, (vmcs), (init))
#define vmx_setup_cr4_shadow(vmcs,init) vmx_setup_cr_shadow(4, (vmcs), (init))
static void *
vmx_vminit(struct vm *vm, pmap_t pmap)
{
uint16_t vpid[VM_MAXCPU];
int i, error;
struct vmx *vmx;
struct vmcs *vmcs;
uint32_t exc_bitmap;
vmx = malloc(sizeof(struct vmx), M_VMX, M_WAITOK | M_ZERO);
if ((uintptr_t)vmx & PAGE_MASK) {
panic("malloc of struct vmx not aligned on %d byte boundary",
PAGE_SIZE);
}
vmx->vm = vm;
vmx->eptp = eptp(vtophys((vm_offset_t)pmap->pm_pml4));
/*
* Clean up EPTP-tagged guest physical and combined mappings
*
* VMX transitions are not required to invalidate any guest physical
* mappings. So, it may be possible for stale guest physical mappings
* to be present in the processor TLBs.
*
* Combined mappings for this EP4TA are also invalidated for all VPIDs.
*/
ept_invalidate_mappings(vmx->eptp);
msr_bitmap_initialize(vmx->msr_bitmap);
/*
* It is safe to allow direct access to MSR_GSBASE and MSR_FSBASE.
* The guest FSBASE and GSBASE are saved and restored during
* vm-exit and vm-entry respectively. The host FSBASE and GSBASE are
* always restored from the vmcs host state area on vm-exit.
*
* The SYSENTER_CS/ESP/EIP MSRs are identical to FS/GSBASE in
* how they are saved/restored so can be directly accessed by the
* guest.
*
* MSR_EFER is saved and restored in the guest VMCS area on a
* VM exit and entry respectively. It is also restored from the
* host VMCS area on a VM exit.
*
* MSR_PAT is saved and restored in the guest VMCS are on a VM exit
* and entry respectively. It is also restored from the host VMCS
* area on a VM exit.
*
* The TSC MSR is exposed read-only. Writes are disallowed as that
* will impact the host TSC.
* XXX Writes would be implemented with a wrmsr trap, and
* then modifying the TSC offset in the VMCS.
*/
if (guest_msr_rw(vmx, MSR_GSBASE) ||
guest_msr_rw(vmx, MSR_FSBASE) ||
guest_msr_rw(vmx, MSR_SYSENTER_CS_MSR) ||
guest_msr_rw(vmx, MSR_SYSENTER_ESP_MSR) ||
guest_msr_rw(vmx, MSR_SYSENTER_EIP_MSR) ||
guest_msr_rw(vmx, MSR_EFER) ||
guest_msr_rw(vmx, MSR_PAT) ||
guest_msr_ro(vmx, MSR_TSC))
panic("vmx_vminit: error setting guest msr access");
vpid_alloc(vpid, VM_MAXCPU);
if (virtual_interrupt_delivery) {
error = vm_map_mmio(vm, DEFAULT_APIC_BASE, PAGE_SIZE,
APIC_ACCESS_ADDRESS);
/* XXX this should really return an error to the caller */
KASSERT(error == 0, ("vm_map_mmio(apicbase) error %d", error));
}
for (i = 0; i < VM_MAXCPU; i++) {
vmcs = &vmx->vmcs[i];
vmcs->identifier = vmx_revision();
error = vmclear(vmcs);
if (error != 0) {
panic("vmx_vminit: vmclear error %d on vcpu %d\n",
error, i);
}
vmx_msr_guest_init(vmx, i);
error = vmcs_init(vmcs);
KASSERT(error == 0, ("vmcs_init error %d", error));
VMPTRLD(vmcs);
error = 0;
error += vmwrite(VMCS_HOST_RSP, (u_long)&vmx->ctx[i]);
error += vmwrite(VMCS_EPTP, vmx->eptp);
error += vmwrite(VMCS_PIN_BASED_CTLS, pinbased_ctls);
error += vmwrite(VMCS_PRI_PROC_BASED_CTLS, procbased_ctls);
error += vmwrite(VMCS_SEC_PROC_BASED_CTLS, procbased_ctls2);
error += vmwrite(VMCS_EXIT_CTLS, exit_ctls);
error += vmwrite(VMCS_ENTRY_CTLS, entry_ctls);
error += vmwrite(VMCS_MSR_BITMAP, vtophys(vmx->msr_bitmap));
error += vmwrite(VMCS_VPID, vpid[i]);
/* exception bitmap */
if (vcpu_trace_exceptions(vm, i))
exc_bitmap = 0xffffffff;
else
exc_bitmap = 1 << IDT_MC;
error += vmwrite(VMCS_EXCEPTION_BITMAP, exc_bitmap);
if (virtual_interrupt_delivery) {
error += vmwrite(VMCS_APIC_ACCESS, APIC_ACCESS_ADDRESS);
error += vmwrite(VMCS_VIRTUAL_APIC,
vtophys(&vmx->apic_page[i]));
error += vmwrite(VMCS_EOI_EXIT0, 0);
error += vmwrite(VMCS_EOI_EXIT1, 0);
error += vmwrite(VMCS_EOI_EXIT2, 0);
error += vmwrite(VMCS_EOI_EXIT3, 0);
}
if (posted_interrupts) {
error += vmwrite(VMCS_PIR_VECTOR, pirvec);
error += vmwrite(VMCS_PIR_DESC,
vtophys(&vmx->pir_desc[i]));
}
VMCLEAR(vmcs);
KASSERT(error == 0, ("vmx_vminit: error customizing the vmcs"));
vmx->cap[i].set = 0;
vmx->cap[i].proc_ctls = procbased_ctls;
vmx->cap[i].proc_ctls2 = procbased_ctls2;
vmx->state[i].nextrip = ~0;
vmx->state[i].lastcpu = NOCPU;
vmx->state[i].vpid = vpid[i];
/*
* Set up the CR0/4 shadows, and init the read shadow
* to the power-on register value from the Intel Sys Arch.
* CR0 - 0x60000010
* CR4 - 0
*/
error = vmx_setup_cr0_shadow(vmcs, 0x60000010);
if (error != 0)
panic("vmx_setup_cr0_shadow %d", error);
error = vmx_setup_cr4_shadow(vmcs, 0);
if (error != 0)
panic("vmx_setup_cr4_shadow %d", error);
vmx->ctx[i].pmap = pmap;
}
return (vmx);
}
static int
vmx_handle_cpuid(struct vm *vm, int vcpu, struct vmxctx *vmxctx)
{
int handled, func;
func = vmxctx->guest_rax;
handled = x86_emulate_cpuid(vm, vcpu,
(uint32_t*)(&vmxctx->guest_rax),
(uint32_t*)(&vmxctx->guest_rbx),
(uint32_t*)(&vmxctx->guest_rcx),
(uint32_t*)(&vmxctx->guest_rdx));
return (handled);
}
static __inline void
vmx_run_trace(struct vmx *vmx, int vcpu)
{
#ifdef KTR
VCPU_CTR1(vmx->vm, vcpu, "Resume execution at %#lx", vmcs_guest_rip());
#endif
}
static __inline void
vmx_exit_trace(struct vmx *vmx, int vcpu, uint64_t rip, uint32_t exit_reason,
int handled)
{
#ifdef KTR
VCPU_CTR3(vmx->vm, vcpu, "%s %s vmexit at 0x%0lx",
handled ? "handled" : "unhandled",
exit_reason_to_str(exit_reason), rip);
#endif
}
static __inline void
vmx_astpending_trace(struct vmx *vmx, int vcpu, uint64_t rip)
{
#ifdef KTR
VCPU_CTR1(vmx->vm, vcpu, "astpending vmexit at 0x%0lx", rip);
#endif
}
static VMM_STAT_INTEL(VCPU_INVVPID_SAVED, "Number of vpid invalidations saved");
static VMM_STAT_INTEL(VCPU_INVVPID_DONE, "Number of vpid invalidations done");
/*
* Invalidate guest mappings identified by its vpid from the TLB.
*/
static __inline void
vmx_invvpid(struct vmx *vmx, int vcpu, pmap_t pmap, int running)
{
struct vmxstate *vmxstate;
struct invvpid_desc invvpid_desc;
vmxstate = &vmx->state[vcpu];
if (vmxstate->vpid == 0)
return;
if (!running) {
/*
* Set the 'lastcpu' to an invalid host cpu.
*
* This will invalidate TLB entries tagged with the vcpu's
* vpid the next time it runs via vmx_set_pcpu_defaults().
*/
vmxstate->lastcpu = NOCPU;
return;
}
KASSERT(curthread->td_critnest > 0, ("%s: vcpu %d running outside "
"critical section", __func__, vcpu));
/*
* Invalidate all mappings tagged with 'vpid'
*
* We do this because this vcpu was executing on a different host
* cpu when it last ran. We do not track whether it invalidated
* mappings associated with its 'vpid' during that run. So we must
* assume that the mappings associated with 'vpid' on 'curcpu' are
* stale and invalidate them.
*
* Note that we incur this penalty only when the scheduler chooses to
* move the thread associated with this vcpu between host cpus.
*
* Note also that this will invalidate mappings tagged with 'vpid'
* for "all" EP4TAs.
*/
if (pmap->pm_eptgen == vmx->eptgen[curcpu]) {
invvpid_desc._res1 = 0;
invvpid_desc._res2 = 0;
invvpid_desc.vpid = vmxstate->vpid;
invvpid_desc.linear_addr = 0;
invvpid(INVVPID_TYPE_SINGLE_CONTEXT, invvpid_desc);
vmm_stat_incr(vmx->vm, vcpu, VCPU_INVVPID_DONE, 1);
} else {
/*
* The invvpid can be skipped if an invept is going to
* be performed before entering the guest. The invept
* will invalidate combined mappings tagged with
* 'vmx->eptp' for all vpids.
*/
vmm_stat_incr(vmx->vm, vcpu, VCPU_INVVPID_SAVED, 1);
}
}
static void
vmx_set_pcpu_defaults(struct vmx *vmx, int vcpu, pmap_t pmap)
{
struct vmxstate *vmxstate;
vmxstate = &vmx->state[vcpu];
if (vmxstate->lastcpu == curcpu)
return;
vmxstate->lastcpu = curcpu;
vmm_stat_incr(vmx->vm, vcpu, VCPU_MIGRATIONS, 1);
vmcs_write(VMCS_HOST_TR_BASE, vmm_get_host_trbase());
vmcs_write(VMCS_HOST_GDTR_BASE, vmm_get_host_gdtrbase());
vmcs_write(VMCS_HOST_GS_BASE, vmm_get_host_gsbase());
vmx_invvpid(vmx, vcpu, pmap, 1);
}
/*
* We depend on 'procbased_ctls' to have the Interrupt Window Exiting bit set.
*/
CTASSERT((PROCBASED_CTLS_ONE_SETTING & PROCBASED_INT_WINDOW_EXITING) != 0);
static void __inline
vmx_set_int_window_exiting(struct vmx *vmx, int vcpu)
{
if ((vmx->cap[vcpu].proc_ctls & PROCBASED_INT_WINDOW_EXITING) == 0) {
vmx->cap[vcpu].proc_ctls |= PROCBASED_INT_WINDOW_EXITING;
vmcs_write(VMCS_PRI_PROC_BASED_CTLS, vmx->cap[vcpu].proc_ctls);
VCPU_CTR0(vmx->vm, vcpu, "Enabling interrupt window exiting");
}
}
static void __inline
vmx_clear_int_window_exiting(struct vmx *vmx, int vcpu)
{
KASSERT((vmx->cap[vcpu].proc_ctls & PROCBASED_INT_WINDOW_EXITING) != 0,
("intr_window_exiting not set: %#x", vmx->cap[vcpu].proc_ctls));
vmx->cap[vcpu].proc_ctls &= ~PROCBASED_INT_WINDOW_EXITING;
vmcs_write(VMCS_PRI_PROC_BASED_CTLS, vmx->cap[vcpu].proc_ctls);
VCPU_CTR0(vmx->vm, vcpu, "Disabling interrupt window exiting");
}
static void __inline
vmx_set_nmi_window_exiting(struct vmx *vmx, int vcpu)
{
if ((vmx->cap[vcpu].proc_ctls & PROCBASED_NMI_WINDOW_EXITING) == 0) {
vmx->cap[vcpu].proc_ctls |= PROCBASED_NMI_WINDOW_EXITING;
vmcs_write(VMCS_PRI_PROC_BASED_CTLS, vmx->cap[vcpu].proc_ctls);
VCPU_CTR0(vmx->vm, vcpu, "Enabling NMI window exiting");
}
}
static void __inline
vmx_clear_nmi_window_exiting(struct vmx *vmx, int vcpu)
{
KASSERT((vmx->cap[vcpu].proc_ctls & PROCBASED_NMI_WINDOW_EXITING) != 0,
("nmi_window_exiting not set %#x", vmx->cap[vcpu].proc_ctls));
vmx->cap[vcpu].proc_ctls &= ~PROCBASED_NMI_WINDOW_EXITING;
vmcs_write(VMCS_PRI_PROC_BASED_CTLS, vmx->cap[vcpu].proc_ctls);
VCPU_CTR0(vmx->vm, vcpu, "Disabling NMI window exiting");
}
#define NMI_BLOCKING (VMCS_INTERRUPTIBILITY_NMI_BLOCKING | \
VMCS_INTERRUPTIBILITY_MOVSS_BLOCKING)
#define HWINTR_BLOCKING (VMCS_INTERRUPTIBILITY_STI_BLOCKING | \
VMCS_INTERRUPTIBILITY_MOVSS_BLOCKING)
static void
vmx_inject_nmi(struct vmx *vmx, int vcpu)
{
uint32_t gi, info;
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
KASSERT((gi & NMI_BLOCKING) == 0, ("vmx_inject_nmi: invalid guest "
"interruptibility-state %#x", gi));
info = vmcs_read(VMCS_ENTRY_INTR_INFO);
KASSERT((info & VMCS_INTR_VALID) == 0, ("vmx_inject_nmi: invalid "
"VM-entry interruption information %#x", info));
/*
* Inject the virtual NMI. The vector must be the NMI IDT entry
* or the VMCS entry check will fail.
*/
info = IDT_NMI | VMCS_INTR_T_NMI | VMCS_INTR_VALID;
vmcs_write(VMCS_ENTRY_INTR_INFO, info);
VCPU_CTR0(vmx->vm, vcpu, "Injecting vNMI");
/* Clear the request */
vm_nmi_clear(vmx->vm, vcpu);
}
static void
vmx_inject_interrupts(struct vmx *vmx, int vcpu, struct vlapic *vlapic,
uint64_t guestrip)
{
int vector, need_nmi_exiting, extint_pending;
uint64_t rflags, entryinfo;
uint32_t gi, info;
if (vmx->state[vcpu].nextrip != guestrip) {
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
if (gi & HWINTR_BLOCKING) {
VCPU_CTR2(vmx->vm, vcpu, "Guest interrupt blocking "
"cleared due to rip change: %#lx/%#lx",
vmx->state[vcpu].nextrip, guestrip);
gi &= ~HWINTR_BLOCKING;
vmcs_write(VMCS_GUEST_INTERRUPTIBILITY, gi);
}
}
if (vm_entry_intinfo(vmx->vm, vcpu, &entryinfo)) {
KASSERT((entryinfo & VMCS_INTR_VALID) != 0, ("%s: entry "
"intinfo is not valid: %#lx", __func__, entryinfo));
info = vmcs_read(VMCS_ENTRY_INTR_INFO);
KASSERT((info & VMCS_INTR_VALID) == 0, ("%s: cannot inject "
"pending exception: %#lx/%#x", __func__, entryinfo, info));
info = entryinfo;
vector = info & 0xff;
if (vector == IDT_BP || vector == IDT_OF) {
/*
* VT-x requires #BP and #OF to be injected as software
* exceptions.
*/
info &= ~VMCS_INTR_T_MASK;
info |= VMCS_INTR_T_SWEXCEPTION;
}
if (info & VMCS_INTR_DEL_ERRCODE)
vmcs_write(VMCS_ENTRY_EXCEPTION_ERROR, entryinfo >> 32);
vmcs_write(VMCS_ENTRY_INTR_INFO, info);
}
if (vm_nmi_pending(vmx->vm, vcpu)) {
/*
* If there are no conditions blocking NMI injection then
* inject it directly here otherwise enable "NMI window
* exiting" to inject it as soon as we can.
*
* We also check for STI_BLOCKING because some implementations
* don't allow NMI injection in this case. If we are running
* on a processor that doesn't have this restriction it will
* immediately exit and the NMI will be injected in the
* "NMI window exiting" handler.
*/
need_nmi_exiting = 1;
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
if ((gi & (HWINTR_BLOCKING | NMI_BLOCKING)) == 0) {
info = vmcs_read(VMCS_ENTRY_INTR_INFO);
if ((info & VMCS_INTR_VALID) == 0) {
vmx_inject_nmi(vmx, vcpu);
need_nmi_exiting = 0;
} else {
VCPU_CTR1(vmx->vm, vcpu, "Cannot inject NMI "
"due to VM-entry intr info %#x", info);
}
} else {
VCPU_CTR1(vmx->vm, vcpu, "Cannot inject NMI due to "
"Guest Interruptibility-state %#x", gi);
}
if (need_nmi_exiting)
vmx_set_nmi_window_exiting(vmx, vcpu);
}
extint_pending = vm_extint_pending(vmx->vm, vcpu);
if (!extint_pending && virtual_interrupt_delivery) {
vmx_inject_pir(vlapic);
return;
}
/*
* If interrupt-window exiting is already in effect then don't bother
* checking for pending interrupts. This is just an optimization and
* not needed for correctness.
*/
if ((vmx->cap[vcpu].proc_ctls & PROCBASED_INT_WINDOW_EXITING) != 0) {
VCPU_CTR0(vmx->vm, vcpu, "Skip interrupt injection due to "
"pending int_window_exiting");
return;
}
if (!extint_pending) {
/* Ask the local apic for a vector to inject */
if (!vlapic_pending_intr(vlapic, &vector))
return;
/*
* From the Intel SDM, Volume 3, Section "Maskable
* Hardware Interrupts":
* - maskable interrupt vectors [16,255] can be delivered
* through the local APIC.
*/
KASSERT(vector >= 16 && vector <= 255,
("invalid vector %d from local APIC", vector));
} else {
/* Ask the legacy pic for a vector to inject */
vatpic_pending_intr(vmx->vm, &vector);
/*
* From the Intel SDM, Volume 3, Section "Maskable
* Hardware Interrupts":
* - maskable interrupt vectors [0,255] can be delivered
* through the INTR pin.
*/
KASSERT(vector >= 0 && vector <= 255,
("invalid vector %d from INTR", vector));
}
/* Check RFLAGS.IF and the interruptibility state of the guest */
rflags = vmcs_read(VMCS_GUEST_RFLAGS);
if ((rflags & PSL_I) == 0) {
VCPU_CTR2(vmx->vm, vcpu, "Cannot inject vector %d due to "
"rflags %#lx", vector, rflags);
goto cantinject;
}
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
if (gi & HWINTR_BLOCKING) {
VCPU_CTR2(vmx->vm, vcpu, "Cannot inject vector %d due to "
"Guest Interruptibility-state %#x", vector, gi);
goto cantinject;
}
info = vmcs_read(VMCS_ENTRY_INTR_INFO);
if (info & VMCS_INTR_VALID) {
/*
* This is expected and could happen for multiple reasons:
* - A vectoring VM-entry was aborted due to astpending
* - A VM-exit happened during event injection.
* - An exception was injected above.
* - An NMI was injected above or after "NMI window exiting"
*/
VCPU_CTR2(vmx->vm, vcpu, "Cannot inject vector %d due to "
"VM-entry intr info %#x", vector, info);
goto cantinject;
}
/* Inject the interrupt */
info = VMCS_INTR_T_HWINTR | VMCS_INTR_VALID;
info |= vector;
vmcs_write(VMCS_ENTRY_INTR_INFO, info);
if (!extint_pending) {
/* Update the Local APIC ISR */
vlapic_intr_accepted(vlapic, vector);
} else {
vm_extint_clear(vmx->vm, vcpu);
vatpic_intr_accepted(vmx->vm, vector);
/*
* After we accepted the current ExtINT the PIC may
* have posted another one. If that is the case, set
* the Interrupt Window Exiting execution control so
* we can inject that one too.
*
* Also, interrupt window exiting allows us to inject any
* pending APIC vector that was preempted by the ExtINT
* as soon as possible. This applies both for the software
* emulated vlapic and the hardware assisted virtual APIC.
*/
vmx_set_int_window_exiting(vmx, vcpu);
}
VCPU_CTR1(vmx->vm, vcpu, "Injecting hwintr at vector %d", vector);
return;
cantinject:
/*
* Set the Interrupt Window Exiting execution control so we can inject
* the interrupt as soon as blocking condition goes away.
*/
vmx_set_int_window_exiting(vmx, vcpu);
}
/*
* If the Virtual NMIs execution control is '1' then the logical processor
* tracks virtual-NMI blocking in the Guest Interruptibility-state field of
* the VMCS. An IRET instruction in VMX non-root operation will remove any
* virtual-NMI blocking.
*
* This unblocking occurs even if the IRET causes a fault. In this case the
* hypervisor needs to restore virtual-NMI blocking before resuming the guest.
*/
static void
vmx_restore_nmi_blocking(struct vmx *vmx, int vcpuid)
{
uint32_t gi;
VCPU_CTR0(vmx->vm, vcpuid, "Restore Virtual-NMI blocking");
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
gi |= VMCS_INTERRUPTIBILITY_NMI_BLOCKING;
vmcs_write(VMCS_GUEST_INTERRUPTIBILITY, gi);
}
static void
vmx_clear_nmi_blocking(struct vmx *vmx, int vcpuid)
{
uint32_t gi;
VCPU_CTR0(vmx->vm, vcpuid, "Clear Virtual-NMI blocking");
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
gi &= ~VMCS_INTERRUPTIBILITY_NMI_BLOCKING;
vmcs_write(VMCS_GUEST_INTERRUPTIBILITY, gi);
}
static void
vmx_assert_nmi_blocking(struct vmx *vmx, int vcpuid)
{
uint32_t gi;
gi = vmcs_read(VMCS_GUEST_INTERRUPTIBILITY);
KASSERT(gi & VMCS_INTERRUPTIBILITY_NMI_BLOCKING,
("NMI blocking is not in effect %#x", gi));
}
static int
vmx_emulate_xsetbv(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
{
struct vmxctx *vmxctx;
uint64_t xcrval;
const struct xsave_limits *limits;
vmxctx = &vmx->ctx[vcpu];
limits = vmm_get_xsave_limits();
/*
* Note that the processor raises a GP# fault on its own if
* xsetbv is executed for CPL != 0, so we do not have to
* emulate that fault here.
*/
/* Only xcr0 is supported. */
if (vmxctx->guest_rcx != 0) {
vm_inject_gp(vmx->vm, vcpu);
return (HANDLED);
}
/* We only handle xcr0 if both the host and guest have XSAVE enabled. */
if (!limits->xsave_enabled || !(vmcs_read(VMCS_GUEST_CR4) & CR4_XSAVE)) {
vm_inject_ud(vmx->vm, vcpu);
return (HANDLED);
}
xcrval = vmxctx->guest_rdx << 32 | (vmxctx->guest_rax & 0xffffffff);
if ((xcrval & ~limits->xcr0_allowed) != 0) {
vm_inject_gp(vmx->vm, vcpu);
return (HANDLED);
}
if (!(xcrval & XFEATURE_ENABLED_X87)) {
vm_inject_gp(vmx->vm, vcpu);
return (HANDLED);
}
/* AVX (YMM_Hi128) requires SSE. */
if (xcrval & XFEATURE_ENABLED_AVX &&
(xcrval & XFEATURE_AVX) != XFEATURE_AVX) {
vm_inject_gp(vmx->vm, vcpu);
return (HANDLED);
}
/*
* AVX512 requires base AVX (YMM_Hi128) as well as OpMask,
* ZMM_Hi256, and Hi16_ZMM.
*/
if (xcrval & XFEATURE_AVX512 &&
(xcrval & (XFEATURE_AVX512 | XFEATURE_AVX)) !=
(XFEATURE_AVX512 | XFEATURE_AVX)) {
vm_inject_gp(vmx->vm, vcpu);
return (HANDLED);
}
/*
* Intel MPX requires both bound register state flags to be
* set.
*/
if (((xcrval & XFEATURE_ENABLED_BNDREGS) != 0) !=
((xcrval & XFEATURE_ENABLED_BNDCSR) != 0)) {
vm_inject_gp(vmx->vm, vcpu);
return (HANDLED);
}
/*
* This runs "inside" vmrun() with the guest's FPU state, so
* modifying xcr0 directly modifies the guest's xcr0, not the
* host's.
*/
load_xcr(0, xcrval);
return (HANDLED);
}
static uint64_t
vmx_get_guest_reg(struct vmx *vmx, int vcpu, int ident)
{
const struct vmxctx *vmxctx;
vmxctx = &vmx->ctx[vcpu];
switch (ident) {
case 0:
return (vmxctx->guest_rax);
case 1:
return (vmxctx->guest_rcx);
case 2:
return (vmxctx->guest_rdx);
case 3:
return (vmxctx->guest_rbx);
case 4:
return (vmcs_read(VMCS_GUEST_RSP));
case 5:
return (vmxctx->guest_rbp);
case 6:
return (vmxctx->guest_rsi);
case 7:
return (vmxctx->guest_rdi);
case 8:
return (vmxctx->guest_r8);
case 9:
return (vmxctx->guest_r9);
case 10:
return (vmxctx->guest_r10);
case 11:
return (vmxctx->guest_r11);
case 12:
return (vmxctx->guest_r12);
case 13:
return (vmxctx->guest_r13);
case 14:
return (vmxctx->guest_r14);
case 15:
return (vmxctx->guest_r15);
default:
panic("invalid vmx register %d", ident);
}
}
static void
vmx_set_guest_reg(struct vmx *vmx, int vcpu, int ident, uint64_t regval)
{
struct vmxctx *vmxctx;
vmxctx = &vmx->ctx[vcpu];
switch (ident) {
case 0:
vmxctx->guest_rax = regval;
break;
case 1:
vmxctx->guest_rcx = regval;
break;
case 2:
vmxctx->guest_rdx = regval;
break;
case 3:
vmxctx->guest_rbx = regval;
break;
case 4:
vmcs_write(VMCS_GUEST_RSP, regval);
break;
case 5:
vmxctx->guest_rbp = regval;
break;
case 6:
vmxctx->guest_rsi = regval;
break;
case 7:
vmxctx->guest_rdi = regval;
break;
case 8:
vmxctx->guest_r8 = regval;
break;
case 9:
vmxctx->guest_r9 = regval;
break;
case 10:
vmxctx->guest_r10 = regval;
break;
case 11:
vmxctx->guest_r11 = regval;
break;
case 12:
vmxctx->guest_r12 = regval;
break;
case 13:
vmxctx->guest_r13 = regval;
break;
case 14:
vmxctx->guest_r14 = regval;
break;
case 15:
vmxctx->guest_r15 = regval;
break;
default:
panic("invalid vmx register %d", ident);
}
}
static int
vmx_emulate_cr0_access(struct vmx *vmx, int vcpu, uint64_t exitqual)
{
uint64_t crval, regval;
/* We only handle mov to %cr0 at this time */
if ((exitqual & 0xf0) != 0x00)
return (UNHANDLED);
regval = vmx_get_guest_reg(vmx, vcpu, (exitqual >> 8) & 0xf);
vmcs_write(VMCS_CR0_SHADOW, regval);
crval = regval | cr0_ones_mask;
crval &= ~cr0_zeros_mask;
vmcs_write(VMCS_GUEST_CR0, crval);
if (regval & CR0_PG) {
uint64_t efer, entry_ctls;
/*
* If CR0.PG is 1 and EFER.LME is 1 then EFER.LMA and
* the "IA-32e mode guest" bit in VM-entry control must be
* equal.
*/
efer = vmcs_read(VMCS_GUEST_IA32_EFER);
if (efer & EFER_LME) {
efer |= EFER_LMA;
vmcs_write(VMCS_GUEST_IA32_EFER, efer);
entry_ctls = vmcs_read(VMCS_ENTRY_CTLS);
entry_ctls |= VM_ENTRY_GUEST_LMA;
vmcs_write(VMCS_ENTRY_CTLS, entry_ctls);
}
}
return (HANDLED);
}
static int
vmx_emulate_cr4_access(struct vmx *vmx, int vcpu, uint64_t exitqual)
{
uint64_t crval, regval;
/* We only handle mov to %cr4 at this time */
if ((exitqual & 0xf0) != 0x00)
return (UNHANDLED);
regval = vmx_get_guest_reg(vmx, vcpu, (exitqual >> 8) & 0xf);
vmcs_write(VMCS_CR4_SHADOW, regval);
crval = regval | cr4_ones_mask;
crval &= ~cr4_zeros_mask;
vmcs_write(VMCS_GUEST_CR4, crval);
return (HANDLED);
}
static int
vmx_emulate_cr8_access(struct vmx *vmx, int vcpu, uint64_t exitqual)
{
struct vlapic *vlapic;
uint64_t cr8;
int regnum;
/* We only handle mov %cr8 to/from a register at this time. */
if ((exitqual & 0xe0) != 0x00) {
return (UNHANDLED);
}
vlapic = vm_lapic(vmx->vm, vcpu);
regnum = (exitqual >> 8) & 0xf;
if (exitqual & 0x10) {
cr8 = vlapic_get_cr8(vlapic);
vmx_set_guest_reg(vmx, vcpu, regnum, cr8);
} else {
cr8 = vmx_get_guest_reg(vmx, vcpu, regnum);
vlapic_set_cr8(vlapic, cr8);
}
return (HANDLED);
}
/*
* From section "Guest Register State" in the Intel SDM: CPL = SS.DPL
*/
static int
vmx_cpl(void)
{
uint32_t ssar;
ssar = vmcs_read(VMCS_GUEST_SS_ACCESS_RIGHTS);
return ((ssar >> 5) & 0x3);
}
static enum vm_cpu_mode
vmx_cpu_mode(void)
{
uint32_t csar;
if (vmcs_read(VMCS_GUEST_IA32_EFER) & EFER_LMA) {
csar = vmcs_read(VMCS_GUEST_CS_ACCESS_RIGHTS);
if (csar & 0x2000)
return (CPU_MODE_64BIT); /* CS.L = 1 */
else
return (CPU_MODE_COMPATIBILITY);
} else if (vmcs_read(VMCS_GUEST_CR0) & CR0_PE) {
return (CPU_MODE_PROTECTED);
} else {
return (CPU_MODE_REAL);
}
}
static enum vm_paging_mode
vmx_paging_mode(void)
{
if (!(vmcs_read(VMCS_GUEST_CR0) & CR0_PG))
return (PAGING_MODE_FLAT);
if (!(vmcs_read(VMCS_GUEST_CR4) & CR4_PAE))
return (PAGING_MODE_32);
if (vmcs_read(VMCS_GUEST_IA32_EFER) & EFER_LME)
return (PAGING_MODE_64);
else
return (PAGING_MODE_PAE);
}
static uint64_t
inout_str_index(struct vmx *vmx, int vcpuid, int in)
{
uint64_t val;
int error;
enum vm_reg_name reg;
reg = in ? VM_REG_GUEST_RDI : VM_REG_GUEST_RSI;
error = vmx_getreg(vmx, vcpuid, reg, &val);
KASSERT(error == 0, ("%s: vmx_getreg error %d", __func__, error));
return (val);
}
static uint64_t
inout_str_count(struct vmx *vmx, int vcpuid, int rep)
{
uint64_t val;
int error;
if (rep) {
error = vmx_getreg(vmx, vcpuid, VM_REG_GUEST_RCX, &val);
KASSERT(!error, ("%s: vmx_getreg error %d", __func__, error));
} else {
val = 1;
}
return (val);
}
static int
inout_str_addrsize(uint32_t inst_info)
{
uint32_t size;
size = (inst_info >> 7) & 0x7;
switch (size) {
case 0:
return (2); /* 16 bit */
case 1:
return (4); /* 32 bit */
case 2:
return (8); /* 64 bit */
default:
panic("%s: invalid size encoding %d", __func__, size);
}
}
static void
inout_str_seginfo(struct vmx *vmx, int vcpuid, uint32_t inst_info, int in,
struct vm_inout_str *vis)
{
int error, s;
if (in) {
vis->seg_name = VM_REG_GUEST_ES;
} else {
s = (inst_info >> 15) & 0x7;
vis->seg_name = vm_segment_name(s);
}
error = vmx_getdesc(vmx, vcpuid, vis->seg_name, &vis->seg_desc);
KASSERT(error == 0, ("%s: vmx_getdesc error %d", __func__, error));
}
static void
vmx_paging_info(struct vm_guest_paging *paging)
{
paging->cr3 = vmcs_guest_cr3();
paging->cpl = vmx_cpl();
paging->cpu_mode = vmx_cpu_mode();
paging->paging_mode = vmx_paging_mode();
}
static void
vmexit_inst_emul(struct vm_exit *vmexit, uint64_t gpa, uint64_t gla)
{
struct vm_guest_paging *paging;
uint32_t csar;
paging = &vmexit->u.inst_emul.paging;
vmexit->exitcode = VM_EXITCODE_INST_EMUL;
vmexit->u.inst_emul.gpa = gpa;
vmexit->u.inst_emul.gla = gla;
vmx_paging_info(paging);
switch (paging->cpu_mode) {
case CPU_MODE_PROTECTED:
case CPU_MODE_COMPATIBILITY:
csar = vmcs_read(VMCS_GUEST_CS_ACCESS_RIGHTS);
vmexit->u.inst_emul.cs_d = SEG_DESC_DEF32(csar);
break;
default:
vmexit->u.inst_emul.cs_d = 0;
break;
}
vie_init(&vmexit->u.inst_emul.vie, NULL, 0);
}
static int
ept_fault_type(uint64_t ept_qual)
{
int fault_type;
if (ept_qual & EPT_VIOLATION_DATA_WRITE)
fault_type = VM_PROT_WRITE;
else if (ept_qual & EPT_VIOLATION_INST_FETCH)
fault_type = VM_PROT_EXECUTE;
else
fault_type= VM_PROT_READ;
return (fault_type);
}
static boolean_t
ept_emulation_fault(uint64_t ept_qual)
{
int read, write;
/* EPT fault on an instruction fetch doesn't make sense here */
if (ept_qual & EPT_VIOLATION_INST_FETCH)
return (FALSE);
/* EPT fault must be a read fault or a write fault */
read = ept_qual & EPT_VIOLATION_DATA_READ ? 1 : 0;
write = ept_qual & EPT_VIOLATION_DATA_WRITE ? 1 : 0;
if ((read | write) == 0)
return (FALSE);
/*
* The EPT violation must have been caused by accessing a
* guest-physical address that is a translation of a guest-linear
* address.
*/
if ((ept_qual & EPT_VIOLATION_GLA_VALID) == 0 ||
(ept_qual & EPT_VIOLATION_XLAT_VALID) == 0) {
return (FALSE);
}
return (TRUE);
}
static __inline int
apic_access_virtualization(struct vmx *vmx, int vcpuid)
{
uint32_t proc_ctls2;
proc_ctls2 = vmx->cap[vcpuid].proc_ctls2;
return ((proc_ctls2 & PROCBASED2_VIRTUALIZE_APIC_ACCESSES) ? 1 : 0);
}
static __inline int
x2apic_virtualization(struct vmx *vmx, int vcpuid)
{
uint32_t proc_ctls2;
proc_ctls2 = vmx->cap[vcpuid].proc_ctls2;
return ((proc_ctls2 & PROCBASED2_VIRTUALIZE_X2APIC_MODE) ? 1 : 0);
}
static int
vmx_handle_apic_write(struct vmx *vmx, int vcpuid, struct vlapic *vlapic,
uint64_t qual)
{
int error, handled, offset;
uint32_t *apic_regs, vector;
bool retu;
handled = HANDLED;
offset = APIC_WRITE_OFFSET(qual);
if (!apic_access_virtualization(vmx, vcpuid)) {
/*
* In general there should not be any APIC write VM-exits
* unless APIC-access virtualization is enabled.
*
* However self-IPI virtualization can legitimately trigger
* an APIC-write VM-exit so treat it specially.
*/
if (x2apic_virtualization(vmx, vcpuid) &&
offset == APIC_OFFSET_SELF_IPI) {
apic_regs = (uint32_t *)(vlapic->apic_page);
vector = apic_regs[APIC_OFFSET_SELF_IPI / 4];
vlapic_self_ipi_handler(vlapic, vector);
return (HANDLED);
} else
return (UNHANDLED);
}
switch (offset) {
case APIC_OFFSET_ID:
vlapic_id_write_handler(vlapic);
break;
case APIC_OFFSET_LDR:
vlapic_ldr_write_handler(vlapic);
break;
case APIC_OFFSET_DFR:
vlapic_dfr_write_handler(vlapic);
break;
case APIC_OFFSET_SVR:
vlapic_svr_write_handler(vlapic);
break;
case APIC_OFFSET_ESR:
vlapic_esr_write_handler(vlapic);
break;
case APIC_OFFSET_ICR_LOW:
retu = false;
error = vlapic_icrlo_write_handler(vlapic, &retu);
if (error != 0 || retu)
handled = UNHANDLED;
break;
case APIC_OFFSET_CMCI_LVT:
case APIC_OFFSET_TIMER_LVT ... APIC_OFFSET_ERROR_LVT:
vlapic_lvt_write_handler(vlapic, offset);
break;
case APIC_OFFSET_TIMER_ICR:
vlapic_icrtmr_write_handler(vlapic);
break;
case APIC_OFFSET_TIMER_DCR:
vlapic_dcr_write_handler(vlapic);
break;
default:
handled = UNHANDLED;
break;
}
return (handled);
}
static bool
apic_access_fault(struct vmx *vmx, int vcpuid, uint64_t gpa)
{
if (apic_access_virtualization(vmx, vcpuid) &&
(gpa >= DEFAULT_APIC_BASE && gpa < DEFAULT_APIC_BASE + PAGE_SIZE))
return (true);
else
return (false);
}
static int
vmx_handle_apic_access(struct vmx *vmx, int vcpuid, struct vm_exit *vmexit)
{
uint64_t qual;
int access_type, offset, allowed;
if (!apic_access_virtualization(vmx, vcpuid))
return (UNHANDLED);
qual = vmexit->u.vmx.exit_qualification;
access_type = APIC_ACCESS_TYPE(qual);
offset = APIC_ACCESS_OFFSET(qual);
allowed = 0;
if (access_type == 0) {
/*
* Read data access to the following registers is expected.
*/
switch (offset) {
case APIC_OFFSET_APR:
case APIC_OFFSET_PPR:
case APIC_OFFSET_RRR:
case APIC_OFFSET_CMCI_LVT:
case APIC_OFFSET_TIMER_CCR:
allowed = 1;
break;
default:
break;
}
} else if (access_type == 1) {
/*
* Write data access to the following registers is expected.
*/
switch (offset) {
case APIC_OFFSET_VER:
case APIC_OFFSET_APR:
case APIC_OFFSET_PPR:
case APIC_OFFSET_RRR:
case APIC_OFFSET_ISR0 ... APIC_OFFSET_ISR7:
case APIC_OFFSET_TMR0 ... APIC_OFFSET_TMR7:
case APIC_OFFSET_IRR0 ... APIC_OFFSET_IRR7:
case APIC_OFFSET_CMCI_LVT:
case APIC_OFFSET_TIMER_CCR:
allowed = 1;
break;
default:
break;
}
}
if (allowed) {
vmexit_inst_emul(vmexit, DEFAULT_APIC_BASE + offset,
VIE_INVALID_GLA);
}
/*
* Regardless of whether the APIC-access is allowed this handler
* always returns UNHANDLED:
* - if the access is allowed then it is handled by emulating the
* instruction that caused the VM-exit (outside the critical section)
* - if the access is not allowed then it will be converted to an
* exitcode of VM_EXITCODE_VMX and will be dealt with in userland.
*/
return (UNHANDLED);
}
static enum task_switch_reason
vmx_task_switch_reason(uint64_t qual)
{
int reason;
reason = (qual >> 30) & 0x3;
switch (reason) {
case 0:
return (TSR_CALL);
case 1:
return (TSR_IRET);
case 2:
return (TSR_JMP);
case 3:
return (TSR_IDT_GATE);
default:
panic("%s: invalid reason %d", __func__, reason);
}
}
static int
emulate_wrmsr(struct vmx *vmx, int vcpuid, u_int num, uint64_t val, bool *retu)
{
int error;
if (lapic_msr(num))
error = lapic_wrmsr(vmx->vm, vcpuid, num, val, retu);
else
error = vmx_wrmsr(vmx, vcpuid, num, val, retu);
return (error);
}
static int
emulate_rdmsr(struct vmx *vmx, int vcpuid, u_int num, bool *retu)
{
struct vmxctx *vmxctx;
uint64_t result;
uint32_t eax, edx;
int error;
if (lapic_msr(num))
error = lapic_rdmsr(vmx->vm, vcpuid, num, &result, retu);
else
error = vmx_rdmsr(vmx, vcpuid, num, &result, retu);
if (error == 0) {
eax = result;
vmxctx = &vmx->ctx[vcpuid];
error = vmxctx_setreg(vmxctx, VM_REG_GUEST_RAX, eax);
KASSERT(error == 0, ("vmxctx_setreg(rax) error %d", error));
edx = result >> 32;
error = vmxctx_setreg(vmxctx, VM_REG_GUEST_RDX, edx);
KASSERT(error == 0, ("vmxctx_setreg(rdx) error %d", error));
}
return (error);
}
static int
vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
{
int error, errcode, errcode_valid, handled, in;
struct vmxctx *vmxctx;
struct vlapic *vlapic;
struct vm_inout_str *vis;
struct vm_task_switch *ts;
uint32_t eax, ecx, edx, idtvec_info, idtvec_err, intr_info, inst_info;
uint32_t intr_type, intr_vec, reason;
uint64_t exitintinfo, qual, gpa;
bool retu;
CTASSERT((PINBASED_CTLS_ONE_SETTING & PINBASED_VIRTUAL_NMI) != 0);
CTASSERT((PINBASED_CTLS_ONE_SETTING & PINBASED_NMI_EXITING) != 0);
handled = UNHANDLED;
vmxctx = &vmx->ctx[vcpu];
qual = vmexit->u.vmx.exit_qualification;
reason = vmexit->u.vmx.exit_reason;
vmexit->exitcode = VM_EXITCODE_BOGUS;
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_COUNT, 1);
/*
* VM-entry failures during or after loading guest state.
*
* These VM-exits are uncommon but must be handled specially
* as most VM-exit fields are not populated as usual.
*/
if (__predict_false(reason == EXIT_REASON_MCE_DURING_ENTRY)) {
VCPU_CTR0(vmx->vm, vcpu, "Handling MCE during VM-entry");
__asm __volatile("int $18");
return (1);
}
/*
* VM exits that can be triggered during event delivery need to
* be handled specially by re-injecting the event if the IDT
* vectoring information field's valid bit is set.
*
* See "Information for VM Exits During Event Delivery" in Intel SDM
* for details.
*/
idtvec_info = vmcs_idt_vectoring_info();
if (idtvec_info & VMCS_IDT_VEC_VALID) {
idtvec_info &= ~(1 << 12); /* clear undefined bit */
exitintinfo = idtvec_info;
if (idtvec_info & VMCS_IDT_VEC_ERRCODE_VALID) {
idtvec_err = vmcs_idt_vectoring_err();
exitintinfo |= (uint64_t)idtvec_err << 32;
}
error = vm_exit_intinfo(vmx->vm, vcpu, exitintinfo);
KASSERT(error == 0, ("%s: vm_set_intinfo error %d",
__func__, error));
/*
* If 'virtual NMIs' are being used and the VM-exit
* happened while injecting an NMI during the previous
* VM-entry, then clear "blocking by NMI" in the
* Guest Interruptibility-State so the NMI can be
* reinjected on the subsequent VM-entry.
*
* However, if the NMI was being delivered through a task
* gate, then the new task must start execution with NMIs
* blocked so don't clear NMI blocking in this case.
*/
intr_type = idtvec_info & VMCS_INTR_T_MASK;
if (intr_type == VMCS_INTR_T_NMI) {
if (reason != EXIT_REASON_TASK_SWITCH)
vmx_clear_nmi_blocking(vmx, vcpu);
else
vmx_assert_nmi_blocking(vmx, vcpu);
}
/*
* Update VM-entry instruction length if the event being
* delivered was a software interrupt or software exception.
*/
if (intr_type == VMCS_INTR_T_SWINTR ||
intr_type == VMCS_INTR_T_PRIV_SWEXCEPTION ||
intr_type == VMCS_INTR_T_SWEXCEPTION) {
vmcs_write(VMCS_ENTRY_INST_LENGTH, vmexit->inst_length);
}
}
switch (reason) {
case EXIT_REASON_TASK_SWITCH:
ts = &vmexit->u.task_switch;
ts->tsssel = qual & 0xffff;
ts->reason = vmx_task_switch_reason(qual);
ts->ext = 0;
ts->errcode_valid = 0;
vmx_paging_info(&ts->paging);
/*
* If the task switch was due to a CALL, JMP, IRET, software
* interrupt (INT n) or software exception (INT3, INTO),
* then the saved %rip references the instruction that caused
* the task switch. The instruction length field in the VMCS
* is valid in this case.
*
* In all other cases (e.g., NMI, hardware exception) the
* saved %rip is one that would have been saved in the old TSS
* had the task switch completed normally so the instruction
* length field is not needed in this case and is explicitly
* set to 0.
*/
if (ts->reason == TSR_IDT_GATE) {
KASSERT(idtvec_info & VMCS_IDT_VEC_VALID,
("invalid idtvec_info %#x for IDT task switch",
idtvec_info));
intr_type = idtvec_info & VMCS_INTR_T_MASK;
if (intr_type != VMCS_INTR_T_SWINTR &&
intr_type != VMCS_INTR_T_SWEXCEPTION &&
intr_type != VMCS_INTR_T_PRIV_SWEXCEPTION) {
/* Task switch triggered by external event */
ts->ext = 1;
vmexit->inst_length = 0;
if (idtvec_info & VMCS_IDT_VEC_ERRCODE_VALID) {
ts->errcode_valid = 1;
ts->errcode = vmcs_idt_vectoring_err();
}
}
}
vmexit->exitcode = VM_EXITCODE_TASK_SWITCH;
VCPU_CTR4(vmx->vm, vcpu, "task switch reason %d, tss 0x%04x, "
"%s errcode 0x%016lx", ts->reason, ts->tsssel,
ts->ext ? "external" : "internal",
((uint64_t)ts->errcode << 32) | ts->errcode_valid);
break;
case EXIT_REASON_CR_ACCESS:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_CR_ACCESS, 1);
switch (qual & 0xf) {
case 0:
handled = vmx_emulate_cr0_access(vmx, vcpu, qual);
break;
case 4:
handled = vmx_emulate_cr4_access(vmx, vcpu, qual);
break;
case 8:
handled = vmx_emulate_cr8_access(vmx, vcpu, qual);
break;
}
break;
case EXIT_REASON_RDMSR:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_RDMSR, 1);
retu = false;
ecx = vmxctx->guest_rcx;
VCPU_CTR1(vmx->vm, vcpu, "rdmsr 0x%08x", ecx);
error = emulate_rdmsr(vmx, vcpu, ecx, &retu);
if (error) {
vmexit->exitcode = VM_EXITCODE_RDMSR;
vmexit->u.msr.code = ecx;
} else if (!retu) {
handled = HANDLED;
} else {
/* Return to userspace with a valid exitcode */
KASSERT(vmexit->exitcode != VM_EXITCODE_BOGUS,
("emulate_rdmsr retu with bogus exitcode"));
}
break;
case EXIT_REASON_WRMSR:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_WRMSR, 1);
retu = false;
eax = vmxctx->guest_rax;
ecx = vmxctx->guest_rcx;
edx = vmxctx->guest_rdx;
VCPU_CTR2(vmx->vm, vcpu, "wrmsr 0x%08x value 0x%016lx",
ecx, (uint64_t)edx << 32 | eax);
error = emulate_wrmsr(vmx, vcpu, ecx,
(uint64_t)edx << 32 | eax, &retu);
if (error) {
vmexit->exitcode = VM_EXITCODE_WRMSR;
vmexit->u.msr.code = ecx;
vmexit->u.msr.wval = (uint64_t)edx << 32 | eax;
} else if (!retu) {
handled = HANDLED;
} else {
/* Return to userspace with a valid exitcode */
KASSERT(vmexit->exitcode != VM_EXITCODE_BOGUS,
("emulate_wrmsr retu with bogus exitcode"));
}
break;
case EXIT_REASON_HLT:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_HLT, 1);
vmexit->exitcode = VM_EXITCODE_HLT;
vmexit->u.hlt.rflags = vmcs_read(VMCS_GUEST_RFLAGS);
break;
case EXIT_REASON_MTF:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_MTRAP, 1);
vmexit->exitcode = VM_EXITCODE_MTRAP;
vmexit->inst_length = 0;
break;
case EXIT_REASON_PAUSE:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_PAUSE, 1);
vmexit->exitcode = VM_EXITCODE_PAUSE;
break;
case EXIT_REASON_INTR_WINDOW:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_INTR_WINDOW, 1);
vmx_clear_int_window_exiting(vmx, vcpu);
return (1);
case EXIT_REASON_EXT_INTR:
/*
* External interrupts serve only to cause VM exits and allow
* the host interrupt handler to run.
*
* If this external interrupt triggers a virtual interrupt
* to a VM, then that state will be recorded by the
* host interrupt handler in the VM's softc. We will inject
* this virtual interrupt during the subsequent VM enter.
*/
intr_info = vmcs_read(VMCS_EXIT_INTR_INFO);
/*
* XXX: Ignore this exit if VMCS_INTR_VALID is not set.
* This appears to be a bug in VMware Fusion?
*/
if (!(intr_info & VMCS_INTR_VALID))
return (1);
KASSERT((intr_info & VMCS_INTR_VALID) != 0 &&
(intr_info & VMCS_INTR_T_MASK) == VMCS_INTR_T_HWINTR,
("VM exit interruption info invalid: %#x", intr_info));
vmx_trigger_hostintr(intr_info & 0xff);
/*
* This is special. We want to treat this as an 'handled'
* VM-exit but not increment the instruction pointer.
*/
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_EXTINT, 1);
return (1);
case EXIT_REASON_NMI_WINDOW:
/* Exit to allow the pending virtual NMI to be injected */
if (vm_nmi_pending(vmx->vm, vcpu))
vmx_inject_nmi(vmx, vcpu);
vmx_clear_nmi_window_exiting(vmx, vcpu);
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_NMI_WINDOW, 1);
return (1);
case EXIT_REASON_INOUT:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_INOUT, 1);
vmexit->exitcode = VM_EXITCODE_INOUT;
vmexit->u.inout.bytes = (qual & 0x7) + 1;
vmexit->u.inout.in = in = (qual & 0x8) ? 1 : 0;
vmexit->u.inout.string = (qual & 0x10) ? 1 : 0;
vmexit->u.inout.rep = (qual & 0x20) ? 1 : 0;
vmexit->u.inout.port = (uint16_t)(qual >> 16);
vmexit->u.inout.eax = (uint32_t)(vmxctx->guest_rax);
if (vmexit->u.inout.string) {
inst_info = vmcs_read(VMCS_EXIT_INSTRUCTION_INFO);
vmexit->exitcode = VM_EXITCODE_INOUT_STR;
vis = &vmexit->u.inout_str;
vmx_paging_info(&vis->paging);
vis->rflags = vmcs_read(VMCS_GUEST_RFLAGS);
vis->cr0 = vmcs_read(VMCS_GUEST_CR0);
vis->index = inout_str_index(vmx, vcpu, in);
vis->count = inout_str_count(vmx, vcpu, vis->inout.rep);
vis->addrsize = inout_str_addrsize(inst_info);
inout_str_seginfo(vmx, vcpu, inst_info, in, vis);
}
break;
case EXIT_REASON_CPUID:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_CPUID, 1);
handled = vmx_handle_cpuid(vmx->vm, vcpu, vmxctx);
break;
case EXIT_REASON_EXCEPTION:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_EXCEPTION, 1);
intr_info = vmcs_read(VMCS_EXIT_INTR_INFO);
KASSERT((intr_info & VMCS_INTR_VALID) != 0,
("VM exit interruption info invalid: %#x", intr_info));
intr_vec = intr_info & 0xff;
intr_type = intr_info & VMCS_INTR_T_MASK;
/*
* If Virtual NMIs control is 1 and the VM-exit is due to a
* fault encountered during the execution of IRET then we must
* restore the state of "virtual-NMI blocking" before resuming
* the guest.
*
* See "Resuming Guest Software after Handling an Exception".
* See "Information for VM Exits Due to Vectored Events".
*/
if ((idtvec_info & VMCS_IDT_VEC_VALID) == 0 &&
(intr_vec != IDT_DF) &&
(intr_info & EXIT_QUAL_NMIUDTI) != 0)
vmx_restore_nmi_blocking(vmx, vcpu);
/*
* The NMI has already been handled in vmx_exit_handle_nmi().
*/
if (intr_type == VMCS_INTR_T_NMI)
return (1);
/*
* Call the machine check handler by hand. Also don't reflect
* the machine check back into the guest.
*/
if (intr_vec == IDT_MC) {
VCPU_CTR0(vmx->vm, vcpu, "Vectoring to MCE handler");
__asm __volatile("int $18");
return (1);
}
if (intr_vec == IDT_PF) {
error = vmxctx_setreg(vmxctx, VM_REG_GUEST_CR2, qual);
KASSERT(error == 0, ("%s: vmxctx_setreg(cr2) error %d",
__func__, error));
}
/*
* Software exceptions exhibit trap-like behavior. This in
* turn requires populating the VM-entry instruction length
* so that the %rip in the trap frame is past the INT3/INTO
* instruction.
*/
if (intr_type == VMCS_INTR_T_SWEXCEPTION)
vmcs_write(VMCS_ENTRY_INST_LENGTH, vmexit->inst_length);
/* Reflect all other exceptions back into the guest */
errcode_valid = errcode = 0;
if (intr_info & VMCS_INTR_DEL_ERRCODE) {
errcode_valid = 1;
errcode = vmcs_read(VMCS_EXIT_INTR_ERRCODE);
}
VCPU_CTR2(vmx->vm, vcpu, "Reflecting exception %d/%#x into "
"the guest", intr_vec, errcode);
error = vm_inject_exception(vmx->vm, vcpu, intr_vec,
errcode_valid, errcode, 0);
KASSERT(error == 0, ("%s: vm_inject_exception error %d",
__func__, error));
return (1);
case EXIT_REASON_EPT_FAULT:
/*
* If 'gpa' lies within the address space allocated to
* memory then this must be a nested page fault otherwise
* this must be an instruction that accesses MMIO space.
*/
gpa = vmcs_gpa();
if (vm_mem_allocated(vmx->vm, gpa) ||
apic_access_fault(vmx, vcpu, gpa)) {
vmexit->exitcode = VM_EXITCODE_PAGING;
vmexit->inst_length = 0;
vmexit->u.paging.gpa = gpa;
vmexit->u.paging.fault_type = ept_fault_type(qual);
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_NESTED_FAULT, 1);
} else if (ept_emulation_fault(qual)) {
vmexit_inst_emul(vmexit, gpa, vmcs_gla());
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_INST_EMUL, 1);
}
/*
* If Virtual NMIs control is 1 and the VM-exit is due to an
* EPT fault during the execution of IRET then we must restore
* the state of "virtual-NMI blocking" before resuming.
*
* See description of "NMI unblocking due to IRET" in
* "Exit Qualification for EPT Violations".
*/
if ((idtvec_info & VMCS_IDT_VEC_VALID) == 0 &&
(qual & EXIT_QUAL_NMIUDTI) != 0)
vmx_restore_nmi_blocking(vmx, vcpu);
break;
case EXIT_REASON_VIRTUALIZED_EOI:
vmexit->exitcode = VM_EXITCODE_IOAPIC_EOI;
vmexit->u.ioapic_eoi.vector = qual & 0xFF;
vmexit->inst_length = 0; /* trap-like */
break;
case EXIT_REASON_APIC_ACCESS:
handled = vmx_handle_apic_access(vmx, vcpu, vmexit);
break;
case EXIT_REASON_APIC_WRITE:
/*
* APIC-write VM exit is trap-like so the %rip is already
* pointing to the next instruction.
*/
vmexit->inst_length = 0;
vlapic = vm_lapic(vmx->vm, vcpu);
handled = vmx_handle_apic_write(vmx, vcpu, vlapic, qual);
break;
case EXIT_REASON_XSETBV:
handled = vmx_emulate_xsetbv(vmx, vcpu, vmexit);
break;
case EXIT_REASON_MONITOR:
vmexit->exitcode = VM_EXITCODE_MONITOR;
break;
case EXIT_REASON_MWAIT:
vmexit->exitcode = VM_EXITCODE_MWAIT;
break;
default:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_UNKNOWN, 1);
break;
}
if (handled) {
/*
* It is possible that control is returned to userland
* even though we were able to handle the VM exit in the
* kernel.
*
* In such a case we want to make sure that the userland
* restarts guest execution at the instruction *after*
* the one we just processed. Therefore we update the
* guest rip in the VMCS and in 'vmexit'.
*/
vmexit->rip += vmexit->inst_length;
vmexit->inst_length = 0;
vmcs_write(VMCS_GUEST_RIP, vmexit->rip);
} else {
if (vmexit->exitcode == VM_EXITCODE_BOGUS) {
/*
* If this VM exit was not claimed by anybody then
* treat it as a generic VMX exit.
*/
vmexit->exitcode = VM_EXITCODE_VMX;
vmexit->u.vmx.status = VM_SUCCESS;
vmexit->u.vmx.inst_type = 0;
vmexit->u.vmx.inst_error = 0;
} else {
/*
* The exitcode and collateral have been populated.
* The VM exit will be processed further in userland.
*/
}
}
return (handled);
}
static __inline void
vmx_exit_inst_error(struct vmxctx *vmxctx, int rc, struct vm_exit *vmexit)
{
KASSERT(vmxctx->inst_fail_status != VM_SUCCESS,
("vmx_exit_inst_error: invalid inst_fail_status %d",
vmxctx->inst_fail_status));
vmexit->inst_length = 0;
vmexit->exitcode = VM_EXITCODE_VMX;
vmexit->u.vmx.status = vmxctx->inst_fail_status;
vmexit->u.vmx.inst_error = vmcs_instruction_error();
vmexit->u.vmx.exit_reason = ~0;
vmexit->u.vmx.exit_qualification = ~0;
switch (rc) {
case VMX_VMRESUME_ERROR:
case VMX_VMLAUNCH_ERROR:
case VMX_INVEPT_ERROR:
vmexit->u.vmx.inst_type = rc;
break;
default:
panic("vm_exit_inst_error: vmx_enter_guest returned %d", rc);
}
}
/*
* If the NMI-exiting VM execution control is set to '1' then an NMI in
* non-root operation causes a VM-exit. NMI blocking is in effect so it is
* sufficient to simply vector to the NMI handler via a software interrupt.
* However, this must be done before maskable interrupts are enabled
* otherwise the "iret" issued by an interrupt handler will incorrectly
* clear NMI blocking.
*/
static __inline void
vmx_exit_handle_nmi(struct vmx *vmx, int vcpuid, struct vm_exit *vmexit)
{
uint32_t intr_info;
KASSERT((read_rflags() & PSL_I) == 0, ("interrupts enabled"));
if (vmexit->u.vmx.exit_reason != EXIT_REASON_EXCEPTION)
return;
intr_info = vmcs_read(VMCS_EXIT_INTR_INFO);
KASSERT((intr_info & VMCS_INTR_VALID) != 0,
("VM exit interruption info invalid: %#x", intr_info));
if ((intr_info & VMCS_INTR_T_MASK) == VMCS_INTR_T_NMI) {
KASSERT((intr_info & 0xff) == IDT_NMI, ("VM exit due "
"to NMI has invalid vector: %#x", intr_info));
VCPU_CTR0(vmx->vm, vcpuid, "Vectoring to NMI handler");
__asm __volatile("int $2");
}
}
static int
vmx_run(void *arg, int vcpu, register_t rip, pmap_t pmap,
void *rendezvous_cookie, void *suspend_cookie)
{
int rc, handled, launched;
struct vmx *vmx;
struct vm *vm;
struct vmxctx *vmxctx;
struct vmcs *vmcs;
struct vm_exit *vmexit;
struct vlapic *vlapic;
uint32_t exit_reason;
vmx = arg;
vm = vmx->vm;
vmcs = &vmx->vmcs[vcpu];
vmxctx = &vmx->ctx[vcpu];
vlapic = vm_lapic(vm, vcpu);
vmexit = vm_exitinfo(vm, vcpu);
launched = 0;
KASSERT(vmxctx->pmap == pmap,
("pmap %p different than ctx pmap %p", pmap, vmxctx->pmap));
vmx_msr_guest_enter(vmx, vcpu);
VMPTRLD(vmcs);
/*
* XXX
* We do this every time because we may setup the virtual machine
* from a different process than the one that actually runs it.
*
* If the life of a virtual machine was spent entirely in the context
* of a single process we could do this once in vmx_vminit().
*/
vmcs_write(VMCS_HOST_CR3, rcr3());
vmcs_write(VMCS_GUEST_RIP, rip);
vmx_set_pcpu_defaults(vmx, vcpu, pmap);
do {
KASSERT(vmcs_guest_rip() == rip, ("%s: vmcs guest rip mismatch "
"%#lx/%#lx", __func__, vmcs_guest_rip(), rip));
handled = UNHANDLED;
/*
* Interrupts are disabled from this point on until the
* guest starts executing. This is done for the following
* reasons:
*
* If an AST is asserted on this thread after the check below,
* then the IPI_AST notification will not be lost, because it
* will cause a VM exit due to external interrupt as soon as
* the guest state is loaded.
*
* A posted interrupt after 'vmx_inject_interrupts()' will
* not be "lost" because it will be held pending in the host
* APIC because interrupts are disabled. The pending interrupt
* will be recognized as soon as the guest state is loaded.
*
* The same reasoning applies to the IPI generated by
* pmap_invalidate_ept().
*/
disable_intr();
vmx_inject_interrupts(vmx, vcpu, vlapic, rip);
/*
* Check for vcpu suspension after injecting events because
* vmx_inject_interrupts() can suspend the vcpu due to a
* triple fault.
*/
if (vcpu_suspended(suspend_cookie)) {
enable_intr();
vm_exit_suspended(vmx->vm, vcpu, rip);
break;
}
if (vcpu_rendezvous_pending(rendezvous_cookie)) {
enable_intr();
vm_exit_rendezvous(vmx->vm, vcpu, rip);
break;
}
if (vcpu_should_yield(vm, vcpu)) {
enable_intr();
vm_exit_astpending(vmx->vm, vcpu, rip);
vmx_astpending_trace(vmx, vcpu, rip);
handled = HANDLED;
break;
}
vmx_run_trace(vmx, vcpu);
rc = vmx_enter_guest(vmxctx, vmx, launched);
/* Collect some information for VM exit processing */
vmexit->rip = rip = vmcs_guest_rip();
vmexit->inst_length = vmexit_instruction_length();
vmexit->u.vmx.exit_reason = exit_reason = vmcs_exit_reason();
vmexit->u.vmx.exit_qualification = vmcs_exit_qualification();
/* Update 'nextrip' */
vmx->state[vcpu].nextrip = rip;
if (rc == VMX_GUEST_VMEXIT) {
vmx_exit_handle_nmi(vmx, vcpu, vmexit);
enable_intr();
handled = vmx_exit_process(vmx, vcpu, vmexit);
} else {
enable_intr();
vmx_exit_inst_error(vmxctx, rc, vmexit);
}
launched = 1;
vmx_exit_trace(vmx, vcpu, rip, exit_reason, handled);
rip = vmexit->rip;
} while (handled);
/*
* If a VM exit has been handled then the exitcode must be BOGUS
* If a VM exit is not handled then the exitcode must not be BOGUS
*/
if ((handled && vmexit->exitcode != VM_EXITCODE_BOGUS) ||
(!handled && vmexit->exitcode == VM_EXITCODE_BOGUS)) {
panic("Mismatch between handled (%d) and exitcode (%d)",
handled, vmexit->exitcode);
}
if (!handled)
vmm_stat_incr(vm, vcpu, VMEXIT_USERSPACE, 1);
VCPU_CTR1(vm, vcpu, "returning from vmx_run: exitcode %d",
vmexit->exitcode);
VMCLEAR(vmcs);
vmx_msr_guest_exit(vmx, vcpu);
return (0);
}
static void
vmx_vmcleanup(void *arg)
{
int i;
struct vmx *vmx = arg;
if (apic_access_virtualization(vmx, 0))
vm_unmap_mmio(vmx->vm, DEFAULT_APIC_BASE, PAGE_SIZE);
for (i = 0; i < VM_MAXCPU; i++)
vpid_free(vmx->state[i].vpid);
free(vmx, M_VMX);
return;
}
static register_t *
vmxctx_regptr(struct vmxctx *vmxctx, int reg)
{
switch (reg) {
case VM_REG_GUEST_RAX:
return (&vmxctx->guest_rax);
case VM_REG_GUEST_RBX:
return (&vmxctx->guest_rbx);
case VM_REG_GUEST_RCX:
return (&vmxctx->guest_rcx);
case VM_REG_GUEST_RDX:
return (&vmxctx->guest_rdx);
case VM_REG_GUEST_RSI:
return (&vmxctx->guest_rsi);
case VM_REG_GUEST_RDI:
return (&vmxctx->guest_rdi);
case VM_REG_GUEST_RBP:
return (&vmxctx->guest_rbp);
case VM_REG_GUEST_R8:
return (&vmxctx->guest_r8);
case VM_REG_GUEST_R9:
return (&vmxctx->guest_r9);
case VM_REG_GUEST_R10:
return (&vmxctx->guest_r10);
case VM_REG_GUEST_R11:
return (&vmxctx->guest_r11);
case VM_REG_GUEST_R12:
return (&vmxctx->guest_r12);
case VM_REG_GUEST_R13:
return (&vmxctx->guest_r13);
case VM_REG_GUEST_R14:
return (&vmxctx->guest_r14);
case VM_REG_GUEST_R15:
return (&vmxctx->guest_r15);
case VM_REG_GUEST_CR2:
return (&vmxctx->guest_cr2);
default:
break;
}
return (NULL);
}
static int
vmxctx_getreg(struct vmxctx *vmxctx, int reg, uint64_t *retval)
{
register_t *regp;
if ((regp = vmxctx_regptr(vmxctx, reg)) != NULL) {
*retval = *regp;
return (0);
} else
return (EINVAL);
}
static int
vmxctx_setreg(struct vmxctx *vmxctx, int reg, uint64_t val)
{
register_t *regp;
if ((regp = vmxctx_regptr(vmxctx, reg)) != NULL) {
*regp = val;
return (0);
} else
return (EINVAL);
}
static int
vmx_get_intr_shadow(struct vmx *vmx, int vcpu, int running, uint64_t *retval)
{
uint64_t gi;
int error;
error = vmcs_getreg(&vmx->vmcs[vcpu], running,
VMCS_IDENT(VMCS_GUEST_INTERRUPTIBILITY), &gi);
*retval = (gi & HWINTR_BLOCKING) ? 1 : 0;
return (error);
}
static int
vmx_modify_intr_shadow(struct vmx *vmx, int vcpu, int running, uint64_t val)
{
struct vmcs *vmcs;
uint64_t gi;
int error, ident;
/*
* Forcing the vcpu into an interrupt shadow is not supported.
*/
if (val) {
error = EINVAL;
goto done;
}
vmcs = &vmx->vmcs[vcpu];
ident = VMCS_IDENT(VMCS_GUEST_INTERRUPTIBILITY);
error = vmcs_getreg(vmcs, running, ident, &gi);
if (error == 0) {
gi &= ~HWINTR_BLOCKING;
error = vmcs_setreg(vmcs, running, ident, gi);
}
done:
VCPU_CTR2(vmx->vm, vcpu, "Setting intr_shadow to %#lx %s", val,
error ? "failed" : "succeeded");
return (error);
}
static int
vmx_shadow_reg(int reg)
{
int shreg;
shreg = -1;
switch (reg) {
case VM_REG_GUEST_CR0:
shreg = VMCS_CR0_SHADOW;
break;
case VM_REG_GUEST_CR4:
shreg = VMCS_CR4_SHADOW;
break;
default:
break;
}
return (shreg);
}
static int
vmx_getreg(void *arg, int vcpu, int reg, uint64_t *retval)
{
int running, hostcpu;
struct vmx *vmx = arg;
running = vcpu_is_running(vmx->vm, vcpu, &hostcpu);
if (running && hostcpu != curcpu)
panic("vmx_getreg: %s%d is running", vm_name(vmx->vm), vcpu);
if (reg == VM_REG_GUEST_INTR_SHADOW)
return (vmx_get_intr_shadow(vmx, vcpu, running, retval));
if (vmxctx_getreg(&vmx->ctx[vcpu], reg, retval) == 0)
return (0);
return (vmcs_getreg(&vmx->vmcs[vcpu], running, reg, retval));
}
static int
vmx_setreg(void *arg, int vcpu, int reg, uint64_t val)
{
int error, hostcpu, running, shadow;
uint64_t ctls;
pmap_t pmap;
struct vmx *vmx = arg;
running = vcpu_is_running(vmx->vm, vcpu, &hostcpu);
if (running && hostcpu != curcpu)
panic("vmx_setreg: %s%d is running", vm_name(vmx->vm), vcpu);
if (reg == VM_REG_GUEST_INTR_SHADOW)
return (vmx_modify_intr_shadow(vmx, vcpu, running, val));
if (vmxctx_setreg(&vmx->ctx[vcpu], reg, val) == 0)
return (0);
error = vmcs_setreg(&vmx->vmcs[vcpu], running, reg, val);
if (error == 0) {
/*
* If the "load EFER" VM-entry control is 1 then the
* value of EFER.LMA must be identical to "IA-32e mode guest"
* bit in the VM-entry control.
*/
if ((entry_ctls & VM_ENTRY_LOAD_EFER) != 0 &&
(reg == VM_REG_GUEST_EFER)) {
vmcs_getreg(&vmx->vmcs[vcpu], running,
VMCS_IDENT(VMCS_ENTRY_CTLS), &ctls);
if (val & EFER_LMA)
ctls |= VM_ENTRY_GUEST_LMA;
else
ctls &= ~VM_ENTRY_GUEST_LMA;
vmcs_setreg(&vmx->vmcs[vcpu], running,
VMCS_IDENT(VMCS_ENTRY_CTLS), ctls);
}
shadow = vmx_shadow_reg(reg);
if (shadow > 0) {
/*
* Store the unmodified value in the shadow
*/
error = vmcs_setreg(&vmx->vmcs[vcpu], running,
VMCS_IDENT(shadow), val);
}
if (reg == VM_REG_GUEST_CR3) {
/*
* Invalidate the guest vcpu's TLB mappings to emulate
* the behavior of updating %cr3.
*
* XXX the processor retains global mappings when %cr3
* is updated but vmx_invvpid() does not.
*/
pmap = vmx->ctx[vcpu].pmap;
vmx_invvpid(vmx, vcpu, pmap, running);
}
}
return (error);
}
static int
vmx_getdesc(void *arg, int vcpu, int reg, struct seg_desc *desc)
{
int hostcpu, running;
struct vmx *vmx = arg;
running = vcpu_is_running(vmx->vm, vcpu, &hostcpu);
if (running && hostcpu != curcpu)
panic("vmx_getdesc: %s%d is running", vm_name(vmx->vm), vcpu);
return (vmcs_getdesc(&vmx->vmcs[vcpu], running, reg, desc));
}
static int
vmx_setdesc(void *arg, int vcpu, int reg, struct seg_desc *desc)
{
int hostcpu, running;
struct vmx *vmx = arg;
running = vcpu_is_running(vmx->vm, vcpu, &hostcpu);
if (running && hostcpu != curcpu)
panic("vmx_setdesc: %s%d is running", vm_name(vmx->vm), vcpu);
return (vmcs_setdesc(&vmx->vmcs[vcpu], running, reg, desc));
}
static int
vmx_getcap(void *arg, int vcpu, int type, int *retval)
{
struct vmx *vmx = arg;
int vcap;
int ret;
ret = ENOENT;
vcap = vmx->cap[vcpu].set;
switch (type) {
case VM_CAP_HALT_EXIT:
if (cap_halt_exit)
ret = 0;
break;
case VM_CAP_PAUSE_EXIT:
if (cap_pause_exit)
ret = 0;
break;
case VM_CAP_MTRAP_EXIT:
if (cap_monitor_trap)
ret = 0;
break;
case VM_CAP_UNRESTRICTED_GUEST:
if (cap_unrestricted_guest)
ret = 0;
break;
case VM_CAP_ENABLE_INVPCID:
if (cap_invpcid)
ret = 0;
break;
default:
break;
}
if (ret == 0)
*retval = (vcap & (1 << type)) ? 1 : 0;
return (ret);
}
static int
vmx_setcap(void *arg, int vcpu, int type, int val)
{
struct vmx *vmx = arg;
struct vmcs *vmcs = &vmx->vmcs[vcpu];
uint32_t baseval;
uint32_t *pptr;
int error;
int flag;
int reg;
int retval;
retval = ENOENT;
pptr = NULL;
switch (type) {
case VM_CAP_HALT_EXIT:
if (cap_halt_exit) {
retval = 0;
pptr = &vmx->cap[vcpu].proc_ctls;
baseval = *pptr;
flag = PROCBASED_HLT_EXITING;
reg = VMCS_PRI_PROC_BASED_CTLS;
}
break;
case VM_CAP_MTRAP_EXIT:
if (cap_monitor_trap) {
retval = 0;
pptr = &vmx->cap[vcpu].proc_ctls;
baseval = *pptr;
flag = PROCBASED_MTF;
reg = VMCS_PRI_PROC_BASED_CTLS;
}
break;
case VM_CAP_PAUSE_EXIT:
if (cap_pause_exit) {
retval = 0;
pptr = &vmx->cap[vcpu].proc_ctls;
baseval = *pptr;
flag = PROCBASED_PAUSE_EXITING;
reg = VMCS_PRI_PROC_BASED_CTLS;
}
break;
case VM_CAP_UNRESTRICTED_GUEST:
if (cap_unrestricted_guest) {
retval = 0;
pptr = &vmx->cap[vcpu].proc_ctls2;
baseval = *pptr;
flag = PROCBASED2_UNRESTRICTED_GUEST;
reg = VMCS_SEC_PROC_BASED_CTLS;
}
break;
case VM_CAP_ENABLE_INVPCID:
if (cap_invpcid) {
retval = 0;
pptr = &vmx->cap[vcpu].proc_ctls2;
baseval = *pptr;
flag = PROCBASED2_ENABLE_INVPCID;
reg = VMCS_SEC_PROC_BASED_CTLS;
}
break;
default:
break;
}
if (retval == 0) {
if (val) {
baseval |= flag;
} else {
baseval &= ~flag;
}
VMPTRLD(vmcs);
error = vmwrite(reg, baseval);
VMCLEAR(vmcs);
if (error) {
retval = error;
} else {
/*
* Update optional stored flags, and record
* setting
*/
if (pptr != NULL) {
*pptr = baseval;
}
if (val) {
vmx->cap[vcpu].set |= (1 << type);
} else {
vmx->cap[vcpu].set &= ~(1 << type);
}
}
}
return (retval);
}
struct vlapic_vtx {
struct vlapic vlapic;
struct pir_desc *pir_desc;
struct vmx *vmx;
};
#define VMX_CTR_PIR(vm, vcpuid, pir_desc, notify, vector, level, msg) \
do { \
VCPU_CTR2(vm, vcpuid, msg " assert %s-triggered vector %d", \
level ? "level" : "edge", vector); \
VCPU_CTR1(vm, vcpuid, msg " pir0 0x%016lx", pir_desc->pir[0]); \
VCPU_CTR1(vm, vcpuid, msg " pir1 0x%016lx", pir_desc->pir[1]); \
VCPU_CTR1(vm, vcpuid, msg " pir2 0x%016lx", pir_desc->pir[2]); \
VCPU_CTR1(vm, vcpuid, msg " pir3 0x%016lx", pir_desc->pir[3]); \
VCPU_CTR1(vm, vcpuid, msg " notify: %s", notify ? "yes" : "no");\
} while (0)
/*
* vlapic->ops handlers that utilize the APICv hardware assist described in
* Chapter 29 of the Intel SDM.
*/
static int
vmx_set_intr_ready(struct vlapic *vlapic, int vector, bool level)
{
struct vlapic_vtx *vlapic_vtx;
struct pir_desc *pir_desc;
uint64_t mask;
int idx, notify;
vlapic_vtx = (struct vlapic_vtx *)vlapic;
pir_desc = vlapic_vtx->pir_desc;
/*
* Keep track of interrupt requests in the PIR descriptor. This is
* because the virtual APIC page pointed to by the VMCS cannot be
* modified if the vcpu is running.
*/
idx = vector / 64;
mask = 1UL << (vector % 64);
atomic_set_long(&pir_desc->pir[idx], mask);
notify = atomic_cmpset_long(&pir_desc->pending, 0, 1);
VMX_CTR_PIR(vlapic->vm, vlapic->vcpuid, pir_desc, notify, vector,
level, "vmx_set_intr_ready");
return (notify);
}
static int
vmx_pending_intr(struct vlapic *vlapic, int *vecptr)
{
struct vlapic_vtx *vlapic_vtx;
struct pir_desc *pir_desc;
struct LAPIC *lapic;
uint64_t pending, pirval;
uint32_t ppr, vpr;
int i;
/*
* This function is only expected to be called from the 'HLT' exit
* handler which does not care about the vector that is pending.
*/
KASSERT(vecptr == NULL, ("vmx_pending_intr: vecptr must be NULL"));
vlapic_vtx = (struct vlapic_vtx *)vlapic;
pir_desc = vlapic_vtx->pir_desc;
pending = atomic_load_acq_long(&pir_desc->pending);
if (!pending)
return (0); /* common case */
/*
* If there is an interrupt pending then it will be recognized only
* if its priority is greater than the processor priority.
*
* Special case: if the processor priority is zero then any pending
* interrupt will be recognized.
*/
lapic = vlapic->apic_page;
ppr = lapic->ppr & 0xf0;
if (ppr == 0)
return (1);
VCPU_CTR1(vlapic->vm, vlapic->vcpuid, "HLT with non-zero PPR %d",
lapic->ppr);
for (i = 3; i >= 0; i--) {
pirval = pir_desc->pir[i];
if (pirval != 0) {
vpr = (i * 64 + flsl(pirval) - 1) & 0xf0;
return (vpr > ppr);
}
}
return (0);
}
static void
vmx_intr_accepted(struct vlapic *vlapic, int vector)
{
panic("vmx_intr_accepted: not expected to be called");
}
static void
vmx_set_tmr(struct vlapic *vlapic, int vector, bool level)
{
struct vlapic_vtx *vlapic_vtx;
struct vmx *vmx;
struct vmcs *vmcs;
uint64_t mask, val;
KASSERT(vector >= 0 && vector <= 255, ("invalid vector %d", vector));
KASSERT(!vcpu_is_running(vlapic->vm, vlapic->vcpuid, NULL),
("vmx_set_tmr: vcpu cannot be running"));
vlapic_vtx = (struct vlapic_vtx *)vlapic;
vmx = vlapic_vtx->vmx;
vmcs = &vmx->vmcs[vlapic->vcpuid];
mask = 1UL << (vector % 64);
VMPTRLD(vmcs);
val = vmcs_read(VMCS_EOI_EXIT(vector));
if (level)
val |= mask;
else
val &= ~mask;
vmcs_write(VMCS_EOI_EXIT(vector), val);
VMCLEAR(vmcs);
}
static void
vmx_enable_x2apic_mode(struct vlapic *vlapic)
{
struct vmx *vmx;
struct vmcs *vmcs;
uint32_t proc_ctls2;
int vcpuid, error;
vcpuid = vlapic->vcpuid;
vmx = ((struct vlapic_vtx *)vlapic)->vmx;
vmcs = &vmx->vmcs[vcpuid];
proc_ctls2 = vmx->cap[vcpuid].proc_ctls2;
KASSERT((proc_ctls2 & PROCBASED2_VIRTUALIZE_APIC_ACCESSES) != 0,
("%s: invalid proc_ctls2 %#x", __func__, proc_ctls2));
proc_ctls2 &= ~PROCBASED2_VIRTUALIZE_APIC_ACCESSES;
proc_ctls2 |= PROCBASED2_VIRTUALIZE_X2APIC_MODE;
vmx->cap[vcpuid].proc_ctls2 = proc_ctls2;
VMPTRLD(vmcs);
vmcs_write(VMCS_SEC_PROC_BASED_CTLS, proc_ctls2);
VMCLEAR(vmcs);
if (vlapic->vcpuid == 0) {
/*
* The nested page table mappings are shared by all vcpus
* so unmap the APIC access page just once.
*/
error = vm_unmap_mmio(vmx->vm, DEFAULT_APIC_BASE, PAGE_SIZE);
KASSERT(error == 0, ("%s: vm_unmap_mmio error %d",
__func__, error));
/*
* The MSR bitmap is shared by all vcpus so modify it only
* once in the context of vcpu 0.
*/
error = vmx_allow_x2apic_msrs(vmx);
KASSERT(error == 0, ("%s: vmx_allow_x2apic_msrs error %d",
__func__, error));
}
}
static void
vmx_post_intr(struct vlapic *vlapic, int hostcpu)
{
ipi_cpu(hostcpu, pirvec);
}
/*
* Transfer the pending interrupts in the PIR descriptor to the IRR
* in the virtual APIC page.
*/
static void
vmx_inject_pir(struct vlapic *vlapic)
{
struct vlapic_vtx *vlapic_vtx;
struct pir_desc *pir_desc;
struct LAPIC *lapic;
uint64_t val, pirval;
int rvi, pirbase = -1;
uint16_t intr_status_old, intr_status_new;
vlapic_vtx = (struct vlapic_vtx *)vlapic;
pir_desc = vlapic_vtx->pir_desc;
if (atomic_cmpset_long(&pir_desc->pending, 1, 0) == 0) {
VCPU_CTR0(vlapic->vm, vlapic->vcpuid, "vmx_inject_pir: "
"no posted interrupt pending");
return;
}
pirval = 0;
pirbase = -1;
lapic = vlapic->apic_page;
val = atomic_readandclear_long(&pir_desc->pir[0]);
if (val != 0) {
lapic->irr0 |= val;
lapic->irr1 |= val >> 32;
pirbase = 0;
pirval = val;
}
val = atomic_readandclear_long(&pir_desc->pir[1]);
if (val != 0) {
lapic->irr2 |= val;
lapic->irr3 |= val >> 32;
pirbase = 64;
pirval = val;
}
val = atomic_readandclear_long(&pir_desc->pir[2]);
if (val != 0) {
lapic->irr4 |= val;
lapic->irr5 |= val >> 32;
pirbase = 128;
pirval = val;
}
val = atomic_readandclear_long(&pir_desc->pir[3]);
if (val != 0) {
lapic->irr6 |= val;
lapic->irr7 |= val >> 32;
pirbase = 192;
pirval = val;
}
VLAPIC_CTR_IRR(vlapic, "vmx_inject_pir");
/*
* Update RVI so the processor can evaluate pending virtual
* interrupts on VM-entry.
*
* It is possible for pirval to be 0 here, even though the
* pending bit has been set. The scenario is:
* CPU-Y is sending a posted interrupt to CPU-X, which
* is running a guest and processing posted interrupts in h/w.
* CPU-X will eventually exit and the state seen in s/w is
* the pending bit set, but no PIR bits set.
*
* CPU-X CPU-Y
* (vm running) (host running)
* rx posted interrupt
* CLEAR pending bit
* SET PIR bit
* READ/CLEAR PIR bits
* SET pending bit
* (vm exit)
* pending bit set, PIR 0
*/
if (pirval != 0) {
rvi = pirbase + flsl(pirval) - 1;
intr_status_old = vmcs_read(VMCS_GUEST_INTR_STATUS);
intr_status_new = (intr_status_old & 0xFF00) | rvi;
if (intr_status_new > intr_status_old) {
vmcs_write(VMCS_GUEST_INTR_STATUS, intr_status_new);
VCPU_CTR2(vlapic->vm, vlapic->vcpuid, "vmx_inject_pir: "
"guest_intr_status changed from 0x%04x to 0x%04x",
intr_status_old, intr_status_new);
}
}
}
static struct vlapic *
vmx_vlapic_init(void *arg, int vcpuid)
{
struct vmx *vmx;
struct vlapic *vlapic;
struct vlapic_vtx *vlapic_vtx;
vmx = arg;
vlapic = malloc(sizeof(struct vlapic_vtx), M_VLAPIC, M_WAITOK | M_ZERO);
vlapic->vm = vmx->vm;
vlapic->vcpuid = vcpuid;
vlapic->apic_page = (struct LAPIC *)&vmx->apic_page[vcpuid];
vlapic_vtx = (struct vlapic_vtx *)vlapic;
vlapic_vtx->pir_desc = &vmx->pir_desc[vcpuid];
vlapic_vtx->vmx = vmx;
if (virtual_interrupt_delivery) {
vlapic->ops.set_intr_ready = vmx_set_intr_ready;
vlapic->ops.pending_intr = vmx_pending_intr;
vlapic->ops.intr_accepted = vmx_intr_accepted;
vlapic->ops.set_tmr = vmx_set_tmr;
vlapic->ops.enable_x2apic_mode = vmx_enable_x2apic_mode;
}
if (posted_interrupts)
vlapic->ops.post_intr = vmx_post_intr;
vlapic_init(vlapic);
return (vlapic);
}
static void
vmx_vlapic_cleanup(void *arg, struct vlapic *vlapic)
{
vlapic_cleanup(vlapic);
free(vlapic, M_VLAPIC);
}
struct vmm_ops vmm_ops_intel = {
vmx_init,
vmx_cleanup,
vmx_restore,
vmx_vminit,
vmx_run,
vmx_vmcleanup,
vmx_getreg,
vmx_setreg,
vmx_getdesc,
vmx_setdesc,
vmx_getcap,
vmx_setcap,
ept_vmspace_alloc,
ept_vmspace_free,
vmx_vlapic_init,
vmx_vlapic_cleanup,
};
Reference in New Issue View Git Blame Copy Permalink