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KVM: nVMX: nSVM: Add a new VCPU statistic to show if VCPU is in guest mode

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Add the following per-VCPU statistic to KVM debugfs to show if a given
VCPU is in guest mode:

	guest_mode

Also add this as a per-VM statistic to KVM debugfs to show the total number
of VCPUs that are in guest mode in a given VM.

Signed-off-by: Krish Sadhukhan <Krish.Sadhukhan@oracle.com>
Message-Id: <20210609180340.104248-3-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Krish Sadhukhan 2021-06-09 14:03:39 -04:00 committed by Paolo Bonzini
parent b93af02c67
commit d5a0483f9f
4 changed files with 16 additions and 0 deletions
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1
arch/x86/include/asm/kvm_host.h
View File

@ -1180,6 +1180,7 @@ struct kvm_vcpu_stat {
u64 nested_run;
u64 directed_yield_attempted;
u64 directed_yield_successful;
u64 guest_mode;
};
struct x86_instruction_info;

11
arch/x86/kvm/debugfs.c
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@ -17,6 +17,15 @@ static int vcpu_get_timer_advance_ns(void *data, u64 *val)
DEFINE_SIMPLE_ATTRIBUTE(vcpu_timer_advance_ns_fops, vcpu_get_timer_advance_ns, NULL, "%llu\n");
static int vcpu_get_guest_mode(void *data, u64 *val)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
*val = vcpu->stat.guest_mode;
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(vcpu_guest_mode_fops, vcpu_get_guest_mode, NULL, "%lld\n");
static int vcpu_get_tsc_offset(void *data, u64 *val)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *) data;
@ -45,6 +54,8 @@ DEFINE_SIMPLE_ATTRIBUTE(vcpu_tsc_scaling_frac_fops, vcpu_get_tsc_scaling_frac_bi
void kvm_arch_create_vcpu_debugfs(struct kvm_vcpu *vcpu, struct dentry *debugfs_dentry)
{
debugfs_create_file("guest_mode", 0444, debugfs_dentry, vcpu,
&vcpu_guest_mode_fops);
debugfs_create_file("tsc-offset", 0444, debugfs_dentry, vcpu,
&vcpu_tsc_offset_fops);

3
arch/x86/kvm/kvm_cache_regs.h
View File

@ -162,6 +162,7 @@ static inline u64 kvm_read_edx_eax(struct kvm_vcpu *vcpu)
static inline void enter_guest_mode(struct kvm_vcpu *vcpu)
{
vcpu->arch.hflags |= HF_GUEST_MASK;
vcpu->stat.guest_mode = 1;
}
static inline void leave_guest_mode(struct kvm_vcpu *vcpu)
@ -172,6 +173,8 @@ static inline void leave_guest_mode(struct kvm_vcpu *vcpu)
vcpu->arch.load_eoi_exitmap_pending = false;
kvm_make_request(KVM_REQ_LOAD_EOI_EXITMAP, vcpu);
}
vcpu->stat.guest_mode = 0;
}
static inline bool is_guest_mode(struct kvm_vcpu *vcpu)

1
arch/x86/kvm/x86.c
View File

@ -250,6 +250,7 @@ struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("nested_run", nested_run),
VCPU_STAT("directed_yield_attempted", directed_yield_attempted),
VCPU_STAT("directed_yield_successful", directed_yield_successful),
VCPU_STAT("guest_mode", guest_mode),
VM_STAT("mmu_shadow_zapped", mmu_shadow_zapped),
VM_STAT("mmu_pte_write", mmu_pte_write),
VM_STAT("mmu_pde_zapped", mmu_pde_zapped),