linux-kernel - Re: [PATCH] x86/retpoline: Also fill return buffer after idle

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Date:   Tue, 09 Jan 2018 00:28:52 +0000
From:   David Woodhouse <dwmw2@...radead.org>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Andi Kleen <andi@...stfloor.org>, pjt@...gle.com,
        linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        gregkh@...ux-foundation.org, tim.c.chen@...ux.intel.com,
        dave.hansen@...el.com, tglx@...utronix.de, peterz@...radead.org,
        luto@...capital.net
Subject: Re: [PATCH] x86/retpoline: Also fill return buffer after idle

On Mon, 2018-01-08 at 16:24 -0800, Andi Kleen wrote:
> > Probably doesn't matter right there but it's going to end up being used
> > elsewhere with IBRS/IBPB, and the compiler is going to think it needs
> > to save all the call-clobbered registers for that. Do we want to make
> > it use inline asm instead?
> 
> You mean KVM?
> 
> All the other places have lots of other calls too, so the registers are likely 
> already clobbered.

Fair enough.
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