Re: [Qemu-devel] [PATCH 1/2] i386: remove the new CPUID 'PCONFIG' from Icelake-Server CPU model

["Daniel P. Berrangé" <berrange@redhat.com>]

On Wed, Dec 19, 2018 at 09:44:40PM +0800, Robert Hoo wrote:
> Signed-off-by: Robert Hoo <robert.hu@linux.intel.com>
> ---
>  target/i386/cpu.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 677a3bd..b6113d0 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -2613,8 +2613,7 @@ static X86CPUDefinition builtin_x86_defs[] = {
>              CPUID_7_0_ECX_AVX512VNNI | CPUID_7_0_ECX_AVX512BITALG |
>              CPUID_7_0_ECX_AVX512_VPOPCNTDQ | CPUID_7_0_ECX_LA57,
>          .features[FEAT_7_0_EDX] =
> -            CPUID_7_0_EDX_PCONFIG | CPUID_7_0_EDX_SPEC_CTRL |
> -            CPUID_7_0_EDX_SPEC_CTRL_SSBD,
> +            CPUID_7_0_EDX_SPEC_CTRL | CPUID_7_0_EDX_SPEC_CTRL_SSBD,
>          /* Missing: XSAVES (not supported by some Linux versions,
>                  * including v4.1 to v4.12).
>                  * KVM doesn't yet expose any XSAVES state save component,

This was shipped in QEMU 3.1.0, so I don't think we can unconditionally
remove it like this without breaking CPU model migration compat. 


Regards,
Daniel
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