From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@kernel.org>,
Boris Ostrovsky <boris.ostrovsky@amd.com>
Cc: Borislav Petkov <bp@alien8.de>,
Linus Torvalds <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [GIT PULL] x86/cpu changes for v3.9
Date: Tue, 19 Feb 2013 09:38:31 -0800 [thread overview]
Message-ID: <5123B897.9010607@zytor.com> (raw)
In-Reply-To: <20130219154721.GA15876@gmail.com>
On 02/19/2013 07:47 AM, Ingo Molnar wrote:
>>
>> Those kill a kvm guest with a #GP. Can we apply the fix for it too pls?
>>
>> http://marc.info/?l=linux-kernel&m=136077007423065&w=2
>
> Linus, please skip this pull request, we'll sort it out.
>
My fault... I was tracking the fix and lost track of the thread.
The problem is that the fix is necessary but not sufficient, as it
introduces an undesirable host-guest dependency. In order to allow
neerw guests to work on older hosts we also should use the
{rd,wr}msr_safe() functions to manipulate this MSR, with a comment as to
why.
Boris, could you prepare such a patch, please?
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2013-02-19 17:40 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-02-19 15:25 [GIT PULL] x86/cpu changes for v3.9 Ingo Molnar
2013-02-19 15:36 ` Borislav Petkov
2013-02-19 15:47 ` Ingo Molnar
2013-02-19 17:38 ` H. Peter Anvin [this message]
2013-02-19 17:47 ` Borislav Petkov
2013-02-19 17:51 ` H. Peter Anvin
2013-02-19 18:33 ` [PATCH 1/2] x86, CPU, AMD: Fix WC+ workaround for older hosts Borislav Petkov
2013-02-19 18:33 ` [PATCH 2/2] x86, kvm: Add MSR_AMD64_BU_CFG2 to the list of ignored MSRs Borislav Petkov
2013-02-19 19:30 ` [tip:x86/cpu] " tip-bot for Borislav Petkov
2013-02-19 19:29 ` [tip:x86/cpu] x86, cpu, amd: Fix WC+ workaround for older virtual hosts tip-bot for Borislav Petkov
2013-02-19 17:57 ` [GIT PULL] x86/cpu changes for v3.9 Konrad Rzeszutek Wilk
2013-02-19 18:01 ` Borislav Petkov
2013-02-19 18:19 ` Boris Ostrovsky
2013-02-19 18:21 ` H. Peter Anvin
2013-02-19 18:26 ` Boris Ostrovsky
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