Re: [PATCH 7/8] KVM: selftests: nested_exceptions_test: Add Zhaoxin CPU support

[Sean Christopherson]

On Thu, Jul 30, 2026, Ewan Hai-oc wrote:
> From: Frank Zhu <frankzhu@xxxxxxxxxxx>
> 
> In the test, the ERROR_CODE_EXT_FLAG bit should not be set in the #GP
> error code on Zhaoxin CPUs.

Why not?

> Add GP_ERROR_CODE_ZX and use it when > running on Zhaoxin hardware.
> 
> Signed-off-by: Frank Zhu <frankzhu@xxxxxxxxxxx>
> Signed-off-by: Ewan Hai <ewanhai-oc@xxxxxxxxxxx>
> ---
>  tools/testing/selftests/kvm/x86/nested_exceptions_test.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/x86/nested_exceptions_test.c b/tools/testing/selftests/kvm/x86/nested_exceptions_test.c
> index aeec3121c8e8..bacbbdc5dc69 100644
> --- a/tools/testing/selftests/kvm/x86/nested_exceptions_test.c
> +++ b/tools/testing/selftests/kvm/x86/nested_exceptions_test.c
> @@ -38,6 +38,7 @@
>   */
>  #define GP_ERROR_CODE_AMD ((SS_VECTOR * 8) | ERROR_CODE_IDT_FLAG)
>  #define GP_ERROR_CODE_INTEL ((SS_VECTOR * 8) | ERROR_CODE_IDT_FLAG | ERROR_CODE_EXT_FLAG)
> +#define GP_ERROR_CODE_ZX ((SS_VECTOR * 8) | ERROR_CODE_IDT_FLAG)
>  
>  /*
>   * Intel and AMD both shove '0' into the error code on #DF, regardless of what
> @@ -139,7 +140,8 @@ static void l1_vmx_code(struct vmx_pages *vmx)
>  	 */
>  	GUEST_ASSERT_EQ(vmwrite(EXCEPTION_BITMAP, INTERCEPT_SS_GP_DF), 0);
>  	vmx_run_l2(l2_ss_pending_test, SS_VECTOR, (u16)SS_ERROR_CODE);
> -	vmx_run_l2(l2_ss_injected_gp_test, GP_VECTOR, GP_ERROR_CODE_INTEL);
> +	vmx_run_l2(l2_ss_injected_gp_test, GP_VECTOR,
> +		   host_cpu_is_zx ? GP_ERROR_CODE_ZX : GP_ERROR_CODE_INTEL);
>  
>  	GUEST_ASSERT_EQ(vmwrite(EXCEPTION_BITMAP, INTERCEPT_SS_DF), 0);
>  	vmx_run_l2(l2_ss_injected_df_test, DF_VECTOR, DF_ERROR_CODE);
> -- 
> 2.34.1
> 
>