KVM: selftests: AVX support + fixes

[PATCH 09/11] KVM: selftests: Drop manual XCR0 configuration from state test

Posted by Sean Christopherson 1 month, 3 weeks ago

Now that CR4.OSXSAVE and XCR0 are setup by default, drop the manual
enabling from the state test, which is fully redundant with the default
behavior.

Signed-off-by: Sean Christopherson <seanjc@google.com>
---
 tools/testing/selftests/kvm/x86_64/state_test.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/tools/testing/selftests/kvm/x86_64/state_test.c b/tools/testing/selftests/kvm/x86_64/state_test.c
index 1c756db329e5..141b7fc0c965 100644
--- a/tools/testing/selftests/kvm/x86_64/state_test.c
+++ b/tools/testing/selftests/kvm/x86_64/state_test.c
@@ -145,11 +145,6 @@ static void __attribute__((__flatten__)) guest_code(void *arg)
 
 		memset(buffer, 0xcc, sizeof(buffer));
 
-		set_cr4(get_cr4() | X86_CR4_OSXSAVE);
-		GUEST_ASSERT(this_cpu_has(X86_FEATURE_OSXSAVE));
-
-		xsetbv(0, xgetbv(0) | supported_xcr0);
-
 		/*
 		 * Modify state for all supported xfeatures to take them out of
 		 * their "init" state, i.e. to make them show up in XSTATE_BV.
-- 
2.47.0.rc0.187.ge670bccf7e-goog

Re: [PATCH 09/11] KVM: selftests: Drop manual XCR0 configuration from state test

Posted by Vitaly Kuznetsov 1 month, 3 weeks ago

Sean Christopherson <seanjc@google.com> writes:

> Now that CR4.OSXSAVE and XCR0 are setup by default, drop the manual
> enabling from the state test, which is fully redundant with the default
> behavior.
>
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
>  tools/testing/selftests/kvm/x86_64/state_test.c | 5 -----
>  1 file changed, 5 deletions(-)
>
> diff --git a/tools/testing/selftests/kvm/x86_64/state_test.c b/tools/testing/selftests/kvm/x86_64/state_test.c
> index 1c756db329e5..141b7fc0c965 100644
> --- a/tools/testing/selftests/kvm/x86_64/state_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/state_test.c
> @@ -145,11 +145,6 @@ static void __attribute__((__flatten__)) guest_code(void *arg)
>  
>  		memset(buffer, 0xcc, sizeof(buffer));
>  
> -		set_cr4(get_cr4() | X86_CR4_OSXSAVE);
> -		GUEST_ASSERT(this_cpu_has(X86_FEATURE_OSXSAVE));
> -
> -		xsetbv(0, xgetbv(0) | supported_xcr0);
> -
>  		/*
>  		 * Modify state for all supported xfeatures to take them out of
>  		 * their "init" state, i.e. to make them show up in XSTATE_BV.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>

-- 
Vitaly