Re: [edk2-devel] [PATCH ovmf v3 4/5] UefiCpuPkg: Add AMD SEV-ES features support

["Lendacky, Thomas via groups.io" <thomas.lendacky=amd.com@groups.io>]

On 5/2/24 09:34, Alexey Kardashevskiy wrote:
> CONFIDENTIAL_COMPUTING_GUEST_ATTR is not a simple SEV level anymore
> and includes a feature mask since a previous commit.
> 
> This fixes AmdMemEncryptionAttrCheck to check the level and feature
> correctly and adds DebugSwap support.
> 
> Since the actual feature flag is not set yet, this should cause
> no behavioural change.
> 
> Cc: Gerd Hoffmann <kraxel@redhat.com>
> Cc: Jiaxin Wu <jiaxin.wu@intel.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Signed-off-by: Alexey Kardashevskiy <aik@amd.com>

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>

> ---
>   UefiCpuPkg/Library/MpInitLib/MpLib.c | 12 +++++++++---
>   1 file changed, 9 insertions(+), 3 deletions(-)
> 
> diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c b/UefiCpuPkg/Library/MpInitLib/MpLib.c
> index d7244565029d..52fddfb7e571 100644
> --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
> @@ -3178,19 +3178,25 @@ AmdMemEncryptionAttrCheck (
>     IN  CONFIDENTIAL_COMPUTING_GUEST_ATTR  Attr
>     )
>   {
> +  UINT64  CurrentLevel;
> +
> +  CurrentLevel = CurrentAttr & CCAttrTypeMask;
> +
>     switch (Attr) {
>       case CCAttrAmdSev:
>         //
>         // SEV is automatically enabled if SEV-ES or SEV-SNP is active.
>         //
> -      return CurrentAttr >= CCAttrAmdSev;
> +      return CurrentLevel >= CCAttrAmdSev;
>       case CCAttrAmdSevEs:
>         //
>         // SEV-ES is automatically enabled if SEV-SNP is active.
>         //
> -      return CurrentAttr >= CCAttrAmdSevEs;
> +      return CurrentLevel >= CCAttrAmdSevEs;
>       case CCAttrAmdSevSnp:
> -      return CurrentAttr == CCAttrAmdSevSnp;
> +      return CurrentLevel == CCAttrAmdSevSnp;
> +    case CCAttrFeatureAmdSevDebugSwap:
> +      return !!(CurrentAttr & CCAttrFeatureAmdSevDebugSwap);
>       default:
>         return FALSE;
>     }


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