Re: [PATCH v2 4/5] *** DO NOT MERGE *** KVM: x86: Hack in a stat to track guest-induced exits (for testing)

[Naveen N Rao <naveen@kernel.org>]

On Wed, May 06, 2026 at 11:47:45AM -0700, Sean Christopherson wrote:
> Not-signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  arch/x86/include/asm/kvm_host.h |  2 +
>  arch/x86/kvm/svm/svm.c          | 81 +++++++++++++++++++++++++++++++++
>  arch/x86/kvm/vmx/vmx.c          | 79 ++++++++++++++++++++++++++++++++
>  arch/x86/kvm/x86.c              |  2 +
>  4 files changed, 164 insertions(+)
> 
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index c470e40a00aa..bff534bd00dc 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1703,6 +1703,8 @@ struct kvm_vcpu_stat {
>  	u64 invlpg;
>  
>  	u64 exits;
> +	u64 guest_induced_exits;
> +	u64 msr_exits;
>  	u64 io_exits;
>  	u64 mmio_exits;
>  	u64 signal_exits;

This looks promising. I'm assuming 'hack' in the title is only meant to 
indicate the PoC nature of this?

Taking this forward, introducing a similar bucket for all AVIC/APICv 
related exits might help with a few tests.


- Naveen