linux-kernel - Re: [PATCH] KVM: emulate: do not adjust size of fastop and setcc subroutines

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Message-ID: <YtGWb3vTITBS9Wj2@zn.tnic>
Date:   Fri, 15 Jul 2022 18:31:43 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org, x86@...nel.org,
        peterz@...radead.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] KVM: emulate: do not adjust size of fastop and setcc
 subroutines

On Fri, Jul 15, 2022 at 07:49:27AM -0400, Paolo Bonzini wrote:
> Instead of doing complicated calculations to find the size of the subroutines
> (which are even more complicated because they need to be stringified into
> an asm statement), just hardcode to 16.
> 
> It is less dense for a few combinations of IBT/SLS/retbleed, but it has
> the advantage of being really simple.
> 
> Suggested-by: Linus Torvalds <torvalds@...ux-foundation.org>
> Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
> ---
>  arch/x86/kvm/emulate.c | 17 +++++++----------
>  1 file changed, 7 insertions(+), 10 deletions(-)

Acked-by: Borislav Petkov <bp@...e.de>

-- 
Regards/Gruss,
    Boris.

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