diff mbox series

[v3,06/13] KVM: selftests: x86: Add the XFD check to IA32_XFD in #NM handler

Message ID 20230221163655.920289-7-mizhang@google.com
State New
Headers
Series Overhauling amx_test |

Commit Message

Mingwei Zhang Feb. 21, 2023, 4:36 p.m. UTC 
  Add an extra check to IA32_XFD to ensure the behavior is consistent with
the AMX archtecture. In addition, repeat the checks across context switch
to ensure the values of IA32_XFD and IA32_XFD_ERR are well preserved.

Signed-off-by: Mingwei Zhang <mizhang@google.com>
---
 tools/testing/selftests/kvm/x86_64/amx_test.c | 2 ++
 1 file changed, 2 insertions(+)

Comments

Sean Christopherson March 24, 2023, 8:39 p.m. UTC | #1 
On Tue, Feb 21, 2023, Mingwei Zhang wrote:
> Add an extra check to IA32_XFD to ensure the behavior is consistent with
> the AMX archtecture. In addition, repeat the checks across context switch
> to ensure the values of IA32_XFD and IA32_XFD_ERR are well preserved.
> 
> Signed-off-by: Mingwei Zhang <mizhang@google.com>
> ---
>  tools/testing/selftests/kvm/x86_64/amx_test.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c
> index ac49b14460b6..296c954dfd6d 100644
> --- a/tools/testing/selftests/kvm/x86_64/amx_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/amx_test.c
> @@ -218,8 +218,10 @@ void guest_nm_handler(struct ex_regs *regs)
>  	GUEST_SYNC(7);
>  	GUEST_ASSERT((get_cr0() & X86_CR0_TS) == 0);
>  	GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
> +	GUEST_ASSERT(rdmsr(MSR_IA32_XFD) & XFEATURE_MASK_XTILEDATA);

These should use ==, not &.  The test explicitly writes MSR_IA32_XFD, i.e. if
there are extra bits set then something is buggy.
diff mbox series

Patch

diff --git a/tools/testing/selftests/kvm/x86_64/amx_test.c b/tools/testing/selftests/kvm/x86_64/amx_test.c
index ac49b14460b6..296c954dfd6d 100644
--- a/tools/testing/selftests/kvm/x86_64/amx_test.c
+++ b/tools/testing/selftests/kvm/x86_64/amx_test.c
@@ -218,8 +218,10 @@  void guest_nm_handler(struct ex_regs *regs)
 	GUEST_SYNC(7);
 	GUEST_ASSERT((get_cr0() & X86_CR0_TS) == 0);
 	GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
+	GUEST_ASSERT(rdmsr(MSR_IA32_XFD) & XFEATURE_MASK_XTILEDATA);
 	GUEST_SYNC(8);
 	GUEST_ASSERT(rdmsr(MSR_IA32_XFD_ERR) == XFEATURE_MASK_XTILEDATA);
+	GUEST_ASSERT(rdmsr(MSR_IA32_XFD) & XFEATURE_MASK_XTILEDATA);
 	/* Clear xfd_err */
 	wrmsr(MSR_IA32_XFD_ERR, 0);
 	/* xfd=0, enable amx */