From: David Woodhouse <dwmw2@infradead.org>
To: Andi Kleen <ak@linux.intel.com>
Cc: Andi Kleen <andi@firstfloor.org>,
pjt@google.com, linux-kernel@vger.kernel.org,
torvalds@linux-foundation.org, gregkh@linux-foundation.org,
tim.c.chen@linux.intel.com, dave.hansen@intel.com,
tglx@linutronix.de, peterz@infradead.org, luto@amacapital.net
Subject: Re: [PATCH] x86/retpoline: Also fill return buffer after idle
Date: Tue, 09 Jan 2018 00:28:52 +0000 [thread overview]
Message-ID: <1515457732.4423.69.camel@infradead.org> (raw)
In-Reply-To: <20180109002407.GF6718@tassilo.jf.intel.com>
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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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next prev parent reply other threads:[~2018-01-09 0:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-08 23:51 Andi Kleen
2018-01-09 0:00 ` David Woodhouse
2018-01-09 0:24 ` Andi Kleen
2018-01-09 0:28 ` David Woodhouse [this message]
2018-01-09 9:37 ` Peter Zijlstra
2018-01-09 13:58 ` David Woodhouse
2018-01-09 14:12 ` Peter Zijlstra
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