linux-kernel - Re: [PATCH 5.10 38/58] KVM: arm64: Allow indirect vectors to be used without SPECTRE

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Date:   Fri, 11 Mar 2022 07:42:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Pavel Machek <pavel@...x.de>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        James Morse <james.morse@....com>
Subject: Re: [PATCH 5.10 38/58] KVM: arm64: Allow indirect vectors to be used
 without SPECTRE_V3A

On Fri, Mar 11, 2022 at 12:48:59AM +0100, Pavel Machek wrote:
> Hi!
> 
> What is going on here?
> 
> > commit 5bdf3437603d4af87f9c7f424b0c8aeed2420745 upstream.
> 
> Upstream commit 5bdf is very different from this. In particular,
> 
> >  arch/arm64/kvm/hyp/smccc_wa.S    |   66 +++++++++++++++++++++++++++++++++++++++
> 
> I can't find smccc_wa.S, neither in mainline, nor in -next. And it
> looks buggy. I suspect loop_k24 should loop 24 times, but it does 8
> loops AFAICT. Same problem with loop_k32.

The kvm portion of these patches is the "trickiest" portions.  I'll let
James explain them, as he did so to me when sending the backports.

thanks,

greg k-h