Re: [PATCH v5 33/75] x86/head/64: Switch to initial stack earlier

Kees Cook
2020-07-24T17:43:14Z

On Fri, Jul 24, 2020 at 06:02:54PM +0200, Joerg Roedel wrote:
> From: Joerg Roedel <jroedel@suse.de>
>
> Make sure there is a stack once the kernel runs from virual addresses.
> At this stage any secondary CPU which boots will have lost its stack
> because the kernel switched to a new page-table which does not map the
> real-mode stack anymore.
>
> This is needed for handling early #VC exceptions caused by instructions
> like CPUID.
>
> Signed-off-by: Joerg Roedel <jroedel@suse.de>

Reviewed-by: Kees Cook <keescook@chromium.org>

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Kees Cook