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KVM: x86: Get exit_reason as part of kvm_x86_ops.get_exit_info

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Extend the get_exit_info static call to provide the reason for the VM
exit. Modify relevant trace points to use this rather than extracting
the reason in the caller.

Signed-off-by: David Edmondson <david.edmondson@oracle.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210920103737.2696756-3-david.edmondson@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
David Edmondson 2021-09-20 11:37:35 +01:00 committed by Paolo Bonzini
parent a9d496d8e0
commit 0a62a0319a
5 changed files with 19 additions and 13 deletions
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7
arch/x86/include/asm/kvm_host.h
View file

@ -1412,10 +1412,11 @@ struct kvm_x86_ops {
void (*write_tsc_multiplier)(struct kvm_vcpu *vcpu, u64 multiplier);
/*
* Retrieve somewhat arbitrary exit information. Intended to be used
* only from within tracepoints to avoid VMREADs when tracing is off.
* Retrieve somewhat arbitrary exit information. Intended to
* be used only from within tracepoints or error paths.
*/
void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
void (*get_exit_info)(struct kvm_vcpu *vcpu, u32 *reason,
u64 *info1, u64 *info2,
u32 *exit_int_info, u32 *exit_int_info_err_code);
int (*check_intercept)(struct kvm_vcpu *vcpu,

8
arch/x86/kvm/svm/svm.c
View file

@ -3362,11 +3362,13 @@ int svm_invoke_exit_handler(struct kvm_vcpu *vcpu, u64 exit_code)
return svm_exit_handlers[exit_code](vcpu);
}
static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
static void svm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
u64 *info1, u64 *info2,
u32 *intr_info, u32 *error_code)
{
struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
*reason = control->exit_code;
*info1 = control->exit_info_1;
*info2 = control->exit_info_2;
*intr_info = control->exit_int_info;
@ -3383,7 +3385,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
struct kvm_run *kvm_run = vcpu->run;
u32 exit_code = svm->vmcb->control.exit_code;
trace_kvm_exit(exit_code, vcpu, KVM_ISA_SVM);
trace_kvm_exit(vcpu, KVM_ISA_SVM);
/* SEV-ES guests must use the CR write traps to track CR registers. */
if (!sev_es_guest(vcpu->kvm)) {
@ -3396,7 +3398,7 @@ static int handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath)
if (is_guest_mode(vcpu)) {
int vmexit;
trace_kvm_nested_vmexit(exit_code, vcpu, KVM_ISA_SVM);
trace_kvm_nested_vmexit(vcpu, KVM_ISA_SVM);
vmexit = nested_svm_exit_special(svm);

9
arch/x86/kvm/trace.h
View file

@ -288,8 +288,8 @@ TRACE_EVENT(kvm_apic,
#define TRACE_EVENT_KVM_EXIT(name) \
TRACE_EVENT(name, \
TP_PROTO(unsigned int exit_reason, struct kvm_vcpu *vcpu, u32 isa), \
TP_ARGS(exit_reason, vcpu, isa), \
TP_PROTO(struct kvm_vcpu *vcpu, u32 isa), \
TP_ARGS(vcpu, isa), \
\
TP_STRUCT__entry( \
__field( unsigned int, exit_reason ) \
@ -303,11 +303,12 @@ TRACE_EVENT(name, \
), \
\
TP_fast_assign( \
__entry->exit_reason = exit_reason; \
__entry->guest_rip = kvm_rip_read(vcpu); \
__entry->isa = isa; \
__entry->vcpu_id = vcpu->vcpu_id; \
static_call(kvm_x86_get_exit_info)(vcpu, &__entry->info1, \
static_call(kvm_x86_get_exit_info)(vcpu, \
&__entry->exit_reason, \
&__entry->info1, \
&__entry->info2, \
&__entry->intr_info, \
&__entry->error_code); \

2
arch/x86/kvm/vmx/nested.c
View file

@ -6066,7 +6066,7 @@ bool nested_vmx_reflect_vmexit(struct kvm_vcpu *vcpu)
goto reflect_vmexit;
}
trace_kvm_nested_vmexit(exit_reason.full, vcpu, KVM_ISA_VMX);
trace_kvm_nested_vmexit(vcpu, KVM_ISA_VMX);
/* If L0 (KVM) wants the exit, it trumps L1's desires. */
if (nested_vmx_l0_wants_exit(vcpu, exit_reason))

6
arch/x86/kvm/vmx/vmx.c
View file

@ -5658,11 +5658,13 @@ static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
static const int kvm_vmx_max_exit_handlers =
ARRAY_SIZE(kvm_vmx_exit_handlers);
static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2,
static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
u64 *info1, u64 *info2,
u32 *intr_info, u32 *error_code)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
*reason = vmx->exit_reason.full;
*info1 = vmx_get_exit_qual(vcpu);
if (!(vmx->exit_reason.failed_vmentry)) {
*info2 = vmx->idt_vectoring_info;
@ -6814,7 +6816,7 @@ static fastpath_t vmx_vcpu_run(struct kvm_vcpu *vcpu)
if (likely(!vmx->exit_reason.failed_vmentry))
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
trace_kvm_exit(vmx->exit_reason.full, vcpu, KVM_ISA_VMX);
trace_kvm_exit(vcpu, KVM_ISA_VMX);
if (unlikely(vmx->exit_reason.failed_vmentry))
return EXIT_FASTPATH_NONE;