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Date:   Tue, 5 Oct 2021 11:28:01 -0500
From:   Tom Lendacky <>
To:     Borislav Petkov <>, Joerg Roedel <>
        Thomas Gleixner <>,
        Ingo Molnar <>,
        "H. Peter Anvin" <>,
        Brijesh Singh <>
Subject: Re: [PATCH -v2] x86/sev: Make the #VC exception stacks part of the
 default stacks storage

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 <>

Tested-by: Tom Lendacky <>

> 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 <>

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