Re: [PATCH -v2] x86/sev: Make the #VC exception stacks part of the default stacks storage

[Brijesh Singh]

On 10/4/21 4:41 PM, Borislav Petkov wrote:
> Yap,
>
> here's v2, now tested. It seems we do need that optional_stack_size
> second arg to ESTACKS_MEMBERS(), thx Tom.
>
> ---
> From: Borislav Petkov <bp@xxxxxxx>
>
> The size of the exception stacks was increased by the commit in Fixes,
> resulting in stack sizes greater than a page in size. The #VC exception
> handling was only mapping the first (bottom) page, resulting in an
> SEV-ES guest failing to boot.
>
> Make the #VC exception stacks part of the default exception stacks
> storage and allocate them with a CONFIG_AMD_MEM_ENCRYPT=y .config. Map
> them only when a SEV-ES guest has been detected.
>
> Rip out the custom VC stacks mapping and storage code.
>
>   [ bp: Steal and adapt Tom's commit message. ]
>
> Fixes: 7fae4c24a2b8 ("x86: Increase exception stack sizes")
> Signed-off-by: Borislav Petkov <bp@xxxxxxx>
> ---

Tested-by: Brijesh Singh <brijesh.singh@xxxxxxx>

thanks