Re: [Qemu-devel] [PULL 4/4] i386: Add "stibp" flag name

[Lendacky, Thomas]

On 12/11/2018 02:53 PM, Eduardo Habkost wrote:
> The STIBP flag may be supported by the host KVM module, so QEMU
> can allow it to be configured manually, and it can be exposed to
> guests when using "-cpu host".
> 
> No additional migration code is required because the whole
> contents of spec_ctrl is already migrated in the "cpu/spec_ctrl"
> section.
> 
> Corresponding KVM patch was submitted at:
> https://lore.kernel.org/lkml/address@hidden/
> 
> Signed-off-by: Eduardo Habkost <address@hidden>
> Message-Id: <address@hidden>
> Signed-off-by: Eduardo Habkost <address@hidden>
> ---
>  target/i386/cpu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 86a934d450..12f559b6af 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -1042,7 +1042,7 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] 
> = {
>              NULL, NULL, NULL, NULL,
>              NULL, NULL, "pconfig", NULL,
>              NULL, NULL, NULL, NULL,
> -            NULL, NULL, "spec-ctrl", NULL,
> +            NULL, NULL, "spec-ctrl", "stibp",

I guess I missed this earlier. Is there a corresponding patch for the AMD
STIBP bit (CPUID 0x80000008_EBX[15]) that is in KVM?

Thanks,
Tom

>              NULL, "arch-capabilities", NULL, "ssbd",
>          },
>          .cpuid = {
>