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KVM: Add instruction-set-specific exit qualifications to kvm_exit trace

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The exit reason alone is insufficient to understand exactly why an exit
occured; add ISA-specific trace parameters for additional information.

Because fetching these parameters is expensive on vmx, and because these
parameters are fetched even if tracing is disabled, we fetch the
parameters via a callback instead of as traditional trace arguments.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2010-11-18 13:09:54 +02:00
parent aa17911e3c
commit 586f960796
4 changed files with 25 additions and 2 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -594,6 +594,7 @@ struct kvm_x86_ops {
void (*write_tsc_offset)(struct kvm_vcpu *vcpu, u64 offset);
void (*get_exit_info)(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2);
const struct trace_print_flags *exit_reasons_str;
};

10
arch/x86/kvm/svm.c
View File

@ -2974,6 +2974,14 @@ void dump_vmcb(struct kvm_vcpu *vcpu)
}
static void svm_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
{
struct vmcb_control_area *control = &to_svm(vcpu)->vmcb->control;
*info1 = control->exit_info_1;
*info2 = control->exit_info_2;
}
static int handle_exit(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@ -3684,7 +3692,9 @@ static struct kvm_x86_ops svm_x86_ops = {
.get_tdp_level = get_npt_level,
.get_mt_mask = svm_get_mt_mask,
.get_exit_info = svm_get_exit_info,
.exit_reasons_str = svm_exit_reasons_str,
.get_lpage_level = svm_get_lpage_level,
.cpuid_update = svm_cpuid_update,

8
arch/x86/kvm/trace.h
View File

@ -192,18 +192,22 @@ TRACE_EVENT(kvm_exit,
__field( unsigned int, exit_reason )
__field( unsigned long, guest_rip )
__field( u32, isa )
__field( u64, info1 )
__field( u64, info2 )
),
TP_fast_assign(
__entry->exit_reason = exit_reason;
__entry->guest_rip = kvm_rip_read(vcpu);
__entry->isa = isa;
kvm_x86_ops->get_exit_info(vcpu, &__entry->info1,
&__entry->info2);
),
TP_printk("reason %s rip 0x%lx",
TP_printk("reason %s rip 0x%lx info %llx %llx",
ftrace_print_symbols_seq(p, __entry->exit_reason,
kvm_x86_ops->exit_reasons_str),
__entry->guest_rip)
__entry->guest_rip, __entry->info1, __entry->info2)
);
/*

8
arch/x86/kvm/vmx.c
View File

@ -3690,6 +3690,12 @@ 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)
{
*info1 = vmcs_readl(EXIT_QUALIFICATION);
*info2 = vmcs_read32(VM_EXIT_INTR_INFO);
}
/*
* The guest has exited. See if we can fix it or if we need userspace
* assistance.
@ -4334,7 +4340,9 @@ static struct kvm_x86_ops vmx_x86_ops = {
.get_tdp_level = get_ept_level,
.get_mt_mask = vmx_get_mt_mask,
.get_exit_info = vmx_get_exit_info,
.exit_reasons_str = vmx_exit_reasons_str,
.get_lpage_level = vmx_get_lpage_level,
.cpuid_update = vmx_cpuid_update,