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Add SDT probes to vmexit on Intel.

Browse Source 
Submitted by:	domagoj.stolfa_gmail.com
Reviewed by:	grehan, tychon
Sponsored by:	DARPA/AFRL
Differential Revision:	https://reviews.freebsd.org/D14656
This commit is contained in:
Tycho Nightingale 2018-04-13 17:23:05 +00:00
parent 7075c67633
commit 6ac73777ea
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=332479
3 changed files with 116 additions and 0 deletions
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5
sys/amd64/include/vmm.h
View File

@ -31,8 +31,13 @@
#ifndef _VMM_H_
#define _VMM_H_
#include <sys/sdt.h>
#include <x86/segments.h>
#ifdef _KERNEL
SDT_PROVIDER_DECLARE(vmm);
#endif
enum vm_suspend_how {
VM_SUSPEND_NONE,
VM_SUSPEND_RESET,

109
sys/amd64/vmm/intel/vmx.c
View File

@ -187,6 +187,82 @@ static u_int vpid_alloc_failed;
SYSCTL_UINT(_hw_vmm_vmx, OID_AUTO, vpid_alloc_failed, CTLFLAG_RD,
&vpid_alloc_failed, 0, NULL);
/*
* The definitions of SDT probes for VMX.
*/
SDT_PROBE_DEFINE3(vmm, vmx, exit, entry,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE4(vmm, vmx, exit, taskswitch,
"struct vmx *", "int", "struct vm_exit *", "struct vm_task_switch *");
SDT_PROBE_DEFINE4(vmm, vmx, exit, craccess,
"struct vmx *", "int", "struct vm_exit *", "uint64_t");
SDT_PROBE_DEFINE4(vmm, vmx, exit, rdmsr,
"struct vmx *", "int", "struct vm_exit *", "uint32_t");
SDT_PROBE_DEFINE5(vmm, vmx, exit, wrmsr,
"struct vmx *", "int", "struct vm_exit *", "uint32_t", "uint64_t");
SDT_PROBE_DEFINE3(vmm, vmx, exit, halt,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, mtrap,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, pause,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, intrwindow,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE4(vmm, vmx, exit, interrupt,
"struct vmx *", "int", "struct vm_exit *", "uint32_t");
SDT_PROBE_DEFINE3(vmm, vmx, exit, nmiwindow,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, inout,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, cpuid,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE5(vmm, vmx, exit, exception,
"struct vmx *", "int", "struct vm_exit *", "uint32_t", "int");
SDT_PROBE_DEFINE5(vmm, vmx, exit, nestedfault,
"struct vmx *", "int", "struct vm_exit *", "uint64_t", "uint64_t");
SDT_PROBE_DEFINE4(vmm, vmx, exit, mmiofault,
"struct vmx *", "int", "struct vm_exit *", "uint64_t");
SDT_PROBE_DEFINE3(vmm, vmx, exit, eoi,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, apicaccess,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE4(vmm, vmx, exit, apicwrite,
"struct vmx *", "int", "struct vm_exit *", "struct vlapic *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, xsetbv,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, monitor,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE3(vmm, vmx, exit, mwait,
"struct vmx *", "int", "struct vm_exit *");
SDT_PROBE_DEFINE4(vmm, vmx, exit, unknown,
"struct vmx *", "int", "struct vm_exit *", "uint32_t");
SDT_PROBE_DEFINE4(vmm, vmx, exit, return,
"struct vmx *", "int", "struct vm_exit *", "int");
/*
* 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
@ -2118,6 +2194,7 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
vmexit->exitcode = VM_EXITCODE_BOGUS;
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_COUNT, 1);
SDT_PROBE3(vmm, vmx, exit, entry, vmx, vcpu, vmexit);
/*
* VM-entry failures during or after loading guest state.
@ -2220,6 +2297,7 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
}
}
vmexit->exitcode = VM_EXITCODE_TASK_SWITCH;
SDT_PROBE4(vmm, vmx, exit, taskswitch, vmx, vcpu, vmexit, ts);
VCPU_CTR4(vmx->vm, vcpu, "task switch reason %d, tss 0x%04x, "
"%s errcode 0x%016lx", ts->reason, ts->tsssel,
ts->ext ? "external" : "internal",
@ -2227,6 +2305,7 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
break;
case EXIT_REASON_CR_ACCESS:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_CR_ACCESS, 1);
SDT_PROBE4(vmm, vmx, exit, craccess, vmx, vcpu, vmexit, qual);
switch (qual & 0xf) {
case 0:
handled = vmx_emulate_cr0_access(vmx, vcpu, qual);
@ -2244,6 +2323,7 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
retu = false;
ecx = vmxctx->guest_rcx;
VCPU_CTR1(vmx->vm, vcpu, "rdmsr 0x%08x", ecx);
SDT_PROBE4(vmm, vmx, exit, rdmsr, vmx, vcpu, vmexit, ecx);
error = emulate_rdmsr(vmx, vcpu, ecx, &retu);
if (error) {
vmexit->exitcode = VM_EXITCODE_RDMSR;
@ -2264,6 +2344,8 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
edx = vmxctx->guest_rdx;
VCPU_CTR2(vmx->vm, vcpu, "wrmsr 0x%08x value 0x%016lx",
ecx, (uint64_t)edx << 32 | eax);
SDT_PROBE5(vmm, vmx, exit, wrmsr, vmx, vmexit, vcpu, ecx,
(uint64_t)edx << 32 | eax);
error = emulate_wrmsr(vmx, vcpu, ecx,
(uint64_t)edx << 32 | eax, &retu);
if (error) {
@ -2280,6 +2362,7 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
break;
case EXIT_REASON_HLT:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_HLT, 1);
SDT_PROBE3(vmm, vmx, exit, halt, vmx, vcpu, vmexit);
vmexit->exitcode = VM_EXITCODE_HLT;
vmexit->u.hlt.rflags = vmcs_read(VMCS_GUEST_RFLAGS);
if (virtual_interrupt_delivery)
@ -2290,15 +2373,18 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
break;
case EXIT_REASON_MTF:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_MTRAP, 1);
SDT_PROBE3(vmm, vmx, exit, mtrap, vmx, vcpu, vmexit);
vmexit->exitcode = VM_EXITCODE_MTRAP;
vmexit->inst_length = 0;
break;
case EXIT_REASON_PAUSE:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_PAUSE, 1);
SDT_PROBE3(vmm, vmx, exit, pause, vmx, vcpu, vmexit);
vmexit->exitcode = VM_EXITCODE_PAUSE;
break;
case EXIT_REASON_INTR_WINDOW:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_INTR_WINDOW, 1);
SDT_PROBE3(vmm, vmx, exit, intrwindow, vmx, vcpu, vmexit);
vmx_clear_int_window_exiting(vmx, vcpu);
return (1);
case EXIT_REASON_EXT_INTR:
@ -2312,6 +2398,8 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
* this virtual interrupt during the subsequent VM enter.
*/
intr_info = vmcs_read(VMCS_EXIT_INTR_INFO);
SDT_PROBE4(vmm, vmx, exit, interrupt,
vmx, vcpu, vmexit, intr_info);
/*
* XXX: Ignore this exit if VMCS_INTR_VALID is not set.
@ -2331,6 +2419,7 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_EXTINT, 1);
return (1);
case EXIT_REASON_NMI_WINDOW:
SDT_PROBE3(vmm, vmx, exit, nmiwindow, vmx, vcpu, vmexit);
/* Exit to allow the pending virtual NMI to be injected */
if (vm_nmi_pending(vmx->vm, vcpu))
vmx_inject_nmi(vmx, vcpu);
@ -2358,9 +2447,11 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
vis->addrsize = inout_str_addrsize(inst_info);
inout_str_seginfo(vmx, vcpu, inst_info, in, vis);
}
SDT_PROBE3(vmm, vmx, exit, inout, vmx, vcpu, vmexit);
break;
case EXIT_REASON_CPUID:
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_CPUID, 1);
SDT_PROBE3(vmm, vmx, exit, cpuid, vmx, vcpu, vmexit);
handled = vmx_handle_cpuid(vmx->vm, vcpu, vmxctx);
break;
case EXIT_REASON_EXCEPTION:
@ -2425,6 +2516,8 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
}
VCPU_CTR2(vmx->vm, vcpu, "Reflecting exception %d/%#x into "
"the guest", intr_vec, errcode);
SDT_PROBE5(vmm, vmx, exit, exception,
vmx, vcpu, vmexit, 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",
@ -2445,9 +2538,13 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
vmexit->u.paging.gpa = gpa;
vmexit->u.paging.fault_type = ept_fault_type(qual);
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_NESTED_FAULT, 1);
SDT_PROBE5(vmm, vmx, exit, nestedfault,
vmx, vcpu, vmexit, gpa, qual);
} else if (ept_emulation_fault(qual)) {
vmexit_inst_emul(vmexit, gpa, vmcs_gla());
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_INST_EMUL, 1);
SDT_PROBE4(vmm, vmx, exit, mmiofault,
vmx, vcpu, vmexit, gpa);
}
/*
* If Virtual NMIs control is 1 and the VM-exit is due to an
@ -2464,9 +2561,11 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
case EXIT_REASON_VIRTUALIZED_EOI:
vmexit->exitcode = VM_EXITCODE_IOAPIC_EOI;
vmexit->u.ioapic_eoi.vector = qual & 0xFF;
SDT_PROBE3(vmm, vmx, exit, eoi, vmx, vcpu, vmexit);
vmexit->inst_length = 0; /* trap-like */
break;
case EXIT_REASON_APIC_ACCESS:
SDT_PROBE3(vmm, vmx, exit, apicaccess, vmx, vcpu, vmexit);
handled = vmx_handle_apic_access(vmx, vcpu, vmexit);
break;
case EXIT_REASON_APIC_WRITE:
@ -2476,18 +2575,25 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
*/
vmexit->inst_length = 0;
vlapic = vm_lapic(vmx->vm, vcpu);
SDT_PROBE4(vmm, vmx, exit, apicwrite,
vmx, vcpu, vmexit, vlapic);
handled = vmx_handle_apic_write(vmx, vcpu, vlapic, qual);
break;
case EXIT_REASON_XSETBV:
SDT_PROBE3(vmm, vmx, exit, xsetbv, vmx, vcpu, vmexit);
handled = vmx_emulate_xsetbv(vmx, vcpu, vmexit);
break;
case EXIT_REASON_MONITOR:
SDT_PROBE3(vmm, vmx, exit, monitor, vmx, vcpu, vmexit);
vmexit->exitcode = VM_EXITCODE_MONITOR;
break;
case EXIT_REASON_MWAIT:
SDT_PROBE3(vmm, vmx, exit, mwait, vmx, vcpu, vmexit);
vmexit->exitcode = VM_EXITCODE_MWAIT;
break;
default:
SDT_PROBE4(vmm, vmx, exit, unknown,
vmx, vcpu, vmexit, reason);
vmm_stat_incr(vmx->vm, vcpu, VMEXIT_UNKNOWN, 1);
break;
}
@ -2523,6 +2629,9 @@ vmx_exit_process(struct vmx *vmx, int vcpu, struct vm_exit *vmexit)
*/
}
}
SDT_PROBE4(vmm, vmx, exit, return,
vmx, vcpu, vmexit, handled);
return (handled);
}

2
sys/amd64/vmm/vmm.c
View File

@ -208,6 +208,8 @@ static struct vmm_ops *ops;
#define fpu_start_emulating() load_cr0(rcr0() | CR0_TS)
#define fpu_stop_emulating() clts()
SDT_PROVIDER_DEFINE(vmm);
static MALLOC_DEFINE(M_VM, "vm", "vm");
/* statistics */