linux-kernel - Re: [PATCH] x86/sev-es: Replace open-coded hlt-loop with sev_es

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Date:   Fri, 18 Mar 2022 09:51:23 +0100
From:   Joerg Roedel <jroedel@...e.de>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     x86@...nel.org, Borislav Petkov <bp@...en8.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86/sev-es: Replace open-coded hlt-loop with
 sev_es_terminate()

On Thu, Mar 17, 2022 at 02:19:13PM -0700, Peter Gonda wrote:
> Replace the hlt loop in handle_vc_boot_ghcb() with an
> sev_es_terminate(). The hlt gives the system no indication the guest is
> unhappy. The termination request will signal there was an error during
> VC handling during boot.
> 
> 
> Cc: Borislav Petkov <bp@...en8.de>
> Cc: Tom Lendacky <thomas.lendacky@....com>
> Cc: Brijesh Singh <brijesh.singh@....com>
> Cc: Joerg Roedel <jroedel@...e.de>
> Cc: x86@...nel.org
> Cc: kvm@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Peter Gonda <pgonda@...gle.com>
> ---
>  arch/x86/kernel/sev.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
> index e6d316a01fdd..ae87fbf27724 100644
> --- a/arch/x86/kernel/sev.c
> +++ b/arch/x86/kernel/sev.c
> @@ -1425,6 +1425,5 @@ bool __init handle_vc_boot_ghcb(struct pt_regs *regs)
>  fail:
>  	show_regs(regs);
>  
> -	while (true)
> -		halt();
> +	sev_es_terminate(GHCB_SEV_ES_GEN_REQ);

Reviewed-by: Joerg Roedel <jroedel@...e.de>