Re: [PATCH v3 5/5] sev/i386: Enable an SEV-ES guest based on SEV policy

[Dr. David Alan Gilbert]

* Tom Lendacky (thomas.lendacky@amd.com) wrote:
> From: Tom Lendacky <thomas.lendacky@amd.com>
> 
> Update the sev_es_enabled() function return value to be based on the SEV
> policy that has been specified. SEV-ES is enabled if SEV is enabled and
> the SEV-ES policy bit is set in the policy object.
> 
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
>  target/i386/sev.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/target/i386/sev.c b/target/i386/sev.c
> index 6ddefc65fa..bcaadaa2f9 100644
> --- a/target/i386/sev.c
> +++ b/target/i386/sev.c
> @@ -70,6 +70,8 @@ struct SevGuestState {
>  #define DEFAULT_GUEST_POLICY    0x1 /* disable debug */
>  #define DEFAULT_SEV_DEVICE      "/dev/sev"
>  
> +#define GUEST_POLICY_SEV_ES_BIT (1 << 2)
> +

I'm surprised that all the policy bits aren't defined in a header somewhere.

But other than that,


Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

>  /* SEV Information Block GUID = 00f771de-1a7e-4fcb-890e-68c77e2fb44e */
>  #define SEV_INFO_BLOCK_GUID \
>      "\xde\x71\xf7\x00\x7e\x1a\xcb\x4f\x89\x0e\x68\xc7\x7e\x2f\xb4\x4e"
> @@ -375,7 +377,7 @@ sev_enabled(void)
>  bool
>  sev_es_enabled(void)
>  {
> -    return false;
> +    return sev_enabled() && (sev_guest->policy & GUEST_POLICY_SEV_ES_BIT);
>  }
>  
>  uint64_t
> -- 
> 2.28.0
> 
-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK