linux-kernel - Re: [stable:PATCH v5.10.105] arm64: kvm: Fix copy-and-paste error in bhb templates for v5.10 stable

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Date:   Thu, 17 Mar 2022 11:03:37 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     James Morse <james.morse@....com>
Cc:     stable@...r.kernel.org, pavel@...x.de, catalin.marinas@....com,
        linux-kernel@...r.kernel.org
Subject: Re: [stable:PATCH v5.10.105] arm64: kvm: Fix copy-and-paste error in
 bhb templates for v5.10 stable

On Tue, Mar 15, 2022 at 01:57:20PM +0000, James Morse wrote:
> KVM's infrastructure for spectre mitigations in the vectors in v5.10 and
> earlier is different, it uses templates which are used to build a set of
> vectors at runtime.
> 
> There are two copy-and-paste errors in the templates: __spectre_bhb_loop_k24
> should loop 24 times and __spectre_bhb_loop_k32 32.
> 
> Fix these.
> 
> Reported-by: Pavel Machek <pavel@...x.de>
> Link: https://lore.kernel.org/all/20220310234858.GB16308@amd/
> Signed-off-by: James Morse <james.morse@....com>
> ---
>  arch/arm64/kvm/hyp/smccc_wa.S | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/kvm/hyp/smccc_wa.S b/arch/arm64/kvm/hyp/smccc_wa.S
> index 24b281912463..533b0aa73256 100644
> --- a/arch/arm64/kvm/hyp/smccc_wa.S
> +++ b/arch/arm64/kvm/hyp/smccc_wa.S
> @@ -68,7 +68,7 @@ SYM_DATA_START(__spectre_bhb_loop_k24)
>  	esb
>  	sub	sp, sp, #(8 * 2)
>  	stp	x0, x1, [sp, #(8 * 0)]
> -	mov	x0, #8
> +	mov	x0, #24
>  2:	b	. + 4
>  	subs	x0, x0, #1
>  	b.ne	2b
> @@ -85,7 +85,7 @@ SYM_DATA_START(__spectre_bhb_loop_k32)
>  	esb
>  	sub	sp, sp, #(8 * 2)
>  	stp	x0, x1, [sp, #(8 * 0)]
> -	mov	x0, #8
> +	mov	x0, #32
>  2:	b	. + 4
>  	subs	x0, x0, #1
>  	b.ne	2b
> -- 
> 2.30.2
> 

Thanks, now queued up!

greg k-h