Provide functions to manipulate the guest state in the VMCB.
Submitted by: Anish Gupta (akgupt3@gmail.com)
This commit is contained in:
Neel Natu
parent
a3d60ba178
commit
934d71fcf4
383
sys/amd64/vmm/amd/vmcb.c
Normal file
383
sys/amd64/vmm/amd/vmcb.c
Normal file
@ -0,0 +1,383 @@
|
||||
/*-
|
||||
* Copyright (c) 2013 Anish Gupta (akgupt3@gmail.com)
|
||||
* 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/cpuset.h>
|
||||
|
||||
#include <machine/segments.h>
|
||||
#include <machine/specialreg.h>
|
||||
#include <machine/vmm.h>
|
||||
|
||||
#include "vmcb.h"
|
||||
|
||||
/*
|
||||
* Initialize SVM h/w context i.e. the VMCB control and saved state areas.
|
||||
*/
|
||||
int
|
||||
svm_init_vmcb(struct vmcb *vmcb, uint64_t iopm_base_pa,
|
||||
uint64_t msrpm_base_pa, uint64_t np_pml4)
|
||||
{
|
||||
struct vmcb_ctrl *ctrl;
|
||||
struct vmcb_state *state;
|
||||
|
||||
ctrl = &vmcb->ctrl;
|
||||
state = &vmcb->state;
|
||||
|
||||
ctrl->iopm_base_pa = iopm_base_pa;
|
||||
ctrl->msrpm_base_pa = msrpm_base_pa;
|
||||
|
||||
/* Enable nested paging */
|
||||
ctrl->np_enable = 1;
|
||||
ctrl->n_cr3 = np_pml4;
|
||||
|
||||
/* EFER_SVM must always be set when the guest is executing */
|
||||
state->efer = EFER_SVM;
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Set non-persistent fields of VMCB that are cleared by VMEXIT and must
|
||||
* be set before restarting the guest (e.g. ASID, intercepts etc).
|
||||
*
|
||||
* APM2, Section 15.6, VMEXIT
|
||||
*/
|
||||
int
|
||||
svm_set_vmcb(struct vmcb *vmcb, uint8_t asid)
|
||||
{
|
||||
struct vmcb_ctrl *ctrl;
|
||||
struct vmcb_state *state;
|
||||
uint16_t cr_shadow;
|
||||
|
||||
ctrl = &vmcb->ctrl;
|
||||
state = &vmcb->state;
|
||||
|
||||
/*
|
||||
* Intercept accesses to the control registers that are not shadowed
|
||||
* in the VMCB - i.e. all except cr0, cr2, cr3, cr4 and cr8.
|
||||
*/
|
||||
cr_shadow = BIT(0) | BIT(2) | BIT(3) | BIT(4) | BIT(8);
|
||||
ctrl->cr_write = ctrl->cr_read = ~cr_shadow;
|
||||
|
||||
/* Intercept Machine Check exceptions. */
|
||||
ctrl->exception = BIT(IDT_MC);
|
||||
|
||||
/* Intercept various events (for e.g. I/O, MSR and CPUID accesses) */
|
||||
ctrl->ctrl1 = VMCB_INTCPT_IO |
|
||||
VMCB_INTCPT_MSR |
|
||||
VMCB_INTCPT_HLT |
|
||||
VMCB_INTCPT_CPUID |
|
||||
VMCB_INTCPT_INTR |
|
||||
VMCB_INTCPT_VINTR |
|
||||
VMCB_INTCPT_INIT |
|
||||
VMCB_INTCPT_NMI |
|
||||
VMCB_INTCPT_SMI |
|
||||
VMCB_INTCPT_FERR_FREEZE |
|
||||
VMCB_INTCPT_SHUTDOWN;
|
||||
|
||||
/* VMRUN intercept is required, see APM2 */
|
||||
ctrl->ctrl2 = VMCB_INTCPT_VMRUN;
|
||||
|
||||
/* ASID is cleared after every #VMEXIT. */
|
||||
ctrl->asid = asid;
|
||||
|
||||
/*
|
||||
* Section 15.21.1, Interrupt Masking in EFLAGS
|
||||
* Section 15.21.2, Virtualizing APIC.TPR
|
||||
*
|
||||
* This must be set for %rflag and %cr8 isolation of guest and host.
|
||||
*/
|
||||
ctrl->v_intr_masking = 1;
|
||||
|
||||
/* Enable Last Branch Record aka LBR for debugging */
|
||||
ctrl->lbr_virt_en = 1;
|
||||
state->dbgctl = BIT(0);
|
||||
|
||||
return (0);
|
||||
}
|
||||
|
||||
/*
|
||||
* Read from segment selector, control and general purpose register of VMCB.
|
||||
*/
|
||||
int
|
||||
vmcb_read(struct vmcb *vmcb, int ident, uint64_t *retval)
|
||||
{
|
||||
struct vmcb_state *state;
|
||||
struct vmcb_segment *seg;
|
||||
int err;
|
||||
|
||||
state = &vmcb->state;
|
||||
err = 0;
|
||||
|
||||
switch (ident) {
|
||||
case VM_REG_GUEST_CR0:
|
||||
*retval = state->cr0;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_CR3:
|
||||
*retval = state->cr3;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_CR4:
|
||||
*retval = state->cr4;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_DR7:
|
||||
*retval = state->dr7;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_EFER:
|
||||
*retval = state->efer;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RAX:
|
||||
*retval = state->rax;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RFLAGS:
|
||||
*retval = state->rflags;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RIP:
|
||||
*retval = state->rip;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RSP:
|
||||
*retval = state->rsp;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_CS:
|
||||
case VM_REG_GUEST_DS:
|
||||
case VM_REG_GUEST_ES:
|
||||
case VM_REG_GUEST_FS:
|
||||
case VM_REG_GUEST_GS:
|
||||
case VM_REG_GUEST_SS:
|
||||
case VM_REG_GUEST_GDTR:
|
||||
case VM_REG_GUEST_IDTR:
|
||||
case VM_REG_GUEST_LDTR:
|
||||
case VM_REG_GUEST_TR:
|
||||
seg = vmcb_seg(vmcb, ident);
|
||||
if (seg == NULL) {
|
||||
ERR("Invalid seg type %d\n", ident);
|
||||
err = EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
*retval = seg->selector;
|
||||
break;
|
||||
|
||||
default:
|
||||
err = EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
return (err);
|
||||
}
|
||||
|
||||
/*
|
||||
* Write to segment selector, control and general purpose register of VMCB.
|
||||
*/
|
||||
int
|
||||
vmcb_write(struct vmcb *vmcb, int ident, uint64_t val)
|
||||
{
|
||||
struct vmcb_state *state;
|
||||
struct vmcb_segment *seg;
|
||||
int err;
|
||||
|
||||
state = &vmcb->state;
|
||||
err = 0;
|
||||
|
||||
switch (ident) {
|
||||
case VM_REG_GUEST_CR0:
|
||||
state->cr0 = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_CR3:
|
||||
state->cr3 = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_CR4:
|
||||
state->cr4 = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_DR7:
|
||||
state->dr7 = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_EFER:
|
||||
/* EFER_SVM must always be set when the guest is executing */
|
||||
state->efer = val | EFER_SVM;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RAX:
|
||||
state->rax = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RFLAGS:
|
||||
state->rflags = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RIP:
|
||||
state->rip = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_RSP:
|
||||
state->rsp = val;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_CS:
|
||||
case VM_REG_GUEST_DS:
|
||||
case VM_REG_GUEST_ES:
|
||||
case VM_REG_GUEST_FS:
|
||||
case VM_REG_GUEST_GS:
|
||||
case VM_REG_GUEST_SS:
|
||||
case VM_REG_GUEST_GDTR:
|
||||
case VM_REG_GUEST_IDTR:
|
||||
case VM_REG_GUEST_LDTR:
|
||||
case VM_REG_GUEST_TR:
|
||||
seg = vmcb_seg(vmcb, ident);
|
||||
if (seg == NULL) {
|
||||
ERR("Invalid segment type %d\n", ident);
|
||||
err = EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
seg->selector = val;
|
||||
break;
|
||||
|
||||
default:
|
||||
err = EINVAL;
|
||||
}
|
||||
|
||||
return (err);
|
||||
}
|
||||
|
||||
/*
|
||||
* Return VMCB segment area.
|
||||
*/
|
||||
struct vmcb_segment *
|
||||
vmcb_seg(struct vmcb *vmcb, int type)
|
||||
{
|
||||
struct vmcb_state *state;
|
||||
struct vmcb_segment *seg;
|
||||
|
||||
state = &vmcb->state;
|
||||
|
||||
switch (type) {
|
||||
case VM_REG_GUEST_CS:
|
||||
seg = &state->cs;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_DS:
|
||||
seg = &state->ds;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_ES:
|
||||
seg = &state->es;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_FS:
|
||||
seg = &state->fs;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_GS:
|
||||
seg = &state->gs;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_SS:
|
||||
seg = &state->ss;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_GDTR:
|
||||
seg = &state->gdt;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_IDTR:
|
||||
seg = &state->idt;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_LDTR:
|
||||
seg = &state->ldt;
|
||||
break;
|
||||
|
||||
case VM_REG_GUEST_TR:
|
||||
seg = &state->tr;
|
||||
break;
|
||||
|
||||
default:
|
||||
seg = NULL;
|
||||
break;
|
||||
}
|
||||
|
||||
return (seg);
|
||||
}
|
||||
|
||||
/*
|
||||
* Inject an event to vcpu as described in section 15.20, "Event injection".
|
||||
*/
|
||||
int
|
||||
vmcb_eventinject(struct vmcb_ctrl *ctrl, int type, int vector,
|
||||
uint32_t error, boolean_t ec_valid)
|
||||
{
|
||||
int intr_type;
|
||||
|
||||
static uint8_t svm_intr_type_map[VM_EVENT_MAX] = {
|
||||
-1, /* VM_EVENT_NONE */
|
||||
VMCB_EVENTINJ_TYPE_INTR, /* VM_HW_INTR */
|
||||
VMCB_EVENTINJ_TYPE_NMI, /* VM_NMI */
|
||||
VMCB_EVENTINJ_TYPE_EXCEPTION, /* VM_HW_EXCEPTION */
|
||||
VMCB_EVENTINJ_TYPE_INTn, /* VM_SW_INTR, INT */
|
||||
VMCB_EVENTINJ_TYPE_INTn, /* VM_PRIV_SW_EXCEPTION */
|
||||
VMCB_EVENTINJ_TYPE_INTn, /* VM_SW_EXCEPTION */
|
||||
};
|
||||
|
||||
intr_type = svm_intr_type_map[type];
|
||||
if (intr_type < VMCB_EVENTINJ_TYPE_INTR ||
|
||||
intr_type > VMCB_EVENTINJ_TYPE_INTn) {
|
||||
ERR("Event:%d is not supported by SVM.\n", type);
|
||||
return (EINVAL);
|
||||
}
|
||||
|
||||
if (intr_type == VMCB_EVENTINJ_TYPE_EXCEPTION && vector == IDT_NMI) {
|
||||
ERR("NMI with Exception type is not possible.\n");
|
||||
return (EINVAL);
|
||||
}
|
||||
|
||||
ctrl->eventinj = (vector & VMCB_EVENTINJ_VECTOR_MASK) |
|
||||
(intr_type << VMCB_EVENTINJ_INTR_TYPE_SHIFT) |
|
||||
(ec_valid ? VMCB_EVENTINJ_EC_VALID : 0) |
|
||||
VMCB_EVENTINJ_VALID;
|
||||
|
||||
ctrl->eventinj |= (uint64_t)error << VMCB_EVENTINJ_ERRCODE_SHIFT;
|
||||
|
||||
return (0);
|
||||
}
|
||||
@ -29,6 +29,14 @@
|
||||
#ifndef _VMCB_H_
|
||||
#define _VMCB_H_
|
||||
|
||||
#ifndef BIT
|
||||
#define BIT(bitpos) (1UL << (bitpos))
|
||||
#endif
|
||||
|
||||
#ifndef ERR
|
||||
#define ERR(...)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Secure Virtual Machine: AMD64 Programmer's Manual Vol2, Chapter 15
|
||||
* Layout of VMCB: AMD64 Programmer's Manual Vol2, Appendix B
|
||||
@ -267,4 +275,13 @@ struct vmcb {
|
||||
CTASSERT(sizeof(struct vmcb) == PAGE_SIZE);
|
||||
CTASSERT(offsetof(struct vmcb, state) == 0x400);
|
||||
|
||||
int svm_init_vmcb(struct vmcb *vmcb, uint64_t iopm_base_pa,
|
||||
uint64_t msrpm_base_pa, uint64_t np_pml4);
|
||||
int svm_set_vmcb(struct vmcb *vmcb, uint8_t asid);
|
||||
int vmcb_read(struct vmcb *vmcb, int ident, uint64_t *retval);
|
||||
int vmcb_write(struct vmcb *vmcb, int ident, uint64_t val);
|
||||
struct vmcb_segment *vmcb_seg(struct vmcb *vmcb, int type);
|
||||
int vmcb_eventinject(struct vmcb_ctrl *ctrl, int type, int vector,
|
||||
uint32_t error, boolean_t ec_valid);
|
||||
|
||||
#endif /* _VMCB_H_ */
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user