Re: [Xen-devel] [PATCH] tools/libxc: Add xstate cpuid leaf of avx512

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 04/11/16 08:29, Luwei Kang wrote:
> Enable get xstate cpuid leaf information regarding avx512 in guest.
>
> Signed-off-by: Luwei Kang <luwei.kang@xxxxxxxxx>

Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

> ---
>  tools/libxc/xc_cpuid_x86.c | 6 ++++++
>  1 file changed, 6 insertions(+)
>
> diff --git a/tools/libxc/xc_cpuid_x86.c b/tools/libxc/xc_cpuid_x86.c
> index de06b32..d761805 100644
> --- a/tools/libxc/xc_cpuid_x86.c
> +++ b/tools/libxc/xc_cpuid_x86.c
> @@ -406,6 +406,9 @@ static void intel_xc_cpuid_policy(xc_interface *xch,
>  #define X86_XCR0_AVX    (1ULL <<  2)
>  #define X86_XCR0_BNDREG (1ULL <<  3)
>  #define X86_XCR0_BNDCSR (1ULL <<  4)
> +#define X86_XCR0_OPMASK (1ULL <<  5)
> +#define X86_XCR0_ZMM    (1ULL <<  6)
> +#define X86_XCR0_HI_ZMM (1ULL <<  7)
>  #define X86_XCR0_PKRU   (1ULL <<  9)
>  #define X86_XCR0_LWP    (1ULL << 62)
>  
> @@ -437,6 +440,9 @@ static void xc_cpuid_config_xsave(xc_interface *xch,
>      if ( test_bit(X86_FEATURE_MPX, info->featureset) )
>          guest_xfeature_mask |= X86_XCR0_BNDREG | X86_XCR0_BNDCSR;
>  
> +    if ( test_bit(X86_FEATURE_AVX512F, info->featureset) )
> +        guest_xfeature_mask |= X86_XCR0_OPMASK | X86_XCR0_ZMM | 
> X86_XCR0_HI_ZMM;
> +
>      if ( test_bit(X86_FEATURE_PKU, info->featureset) )
>          guest_xfeature_mask |= X86_XCR0_PKRU;
>  


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