From: Borislav Petkov <bp@amd64.org>
To: Vladimir Davydov <vdavydov@parallels.com>
Cc: Andre Przywara <andre.przywara@amd.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Andi Kleen <ak@linux.intel.com>,
Borislav Petkov <borislav.petkov@amd.com>,
"x86@kernel.org" <x86@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Andreas Herrmann <andreas.herrmann3@amd.com>
Subject: Re: [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features
Date: Tue, 24 Jul 2012 12:10:41 +0200 [thread overview]
Message-ID: <20120724101041.GA24739@aftab.osrc.amd.com> (raw)
In-Reply-To: <500E5CDF.5000504@parallels.com>
On Tue, Jul 24, 2012 at 12:29:19PM +0400, Vladimir Davydov wrote:
> I guess that when the more advanced features become widely-used,
> vendors will offer new MSRs and/or CPUID faulting.
And this right there is the dealbreaker:
So what are you doing for cpus which have the advanced CPUID features
leafs but there are no MSRs to turn those bits off?
You surely need some software-only solution for the migration to work,
no?
If so, why not apply that solution to your hypervisor without touching
the kernel at all?
Thanks.
--
Regards/Gruss,
Boris.
Advanced Micro Devices GmbH
Einsteinring 24, 85609 Dornach
GM: Alberto Bozzo
Reg: Dornach, Landkreis Muenchen
HRB Nr. 43632 WEEE Registernr: 129 19551
next prev parent reply other threads:[~2012-07-24 10:10 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-20 16:37 [PATCH 1/2] cpu: common: make clearcpuid option take bits list Vladimir Davydov
2012-07-20 16:37 ` [PATCH 2/2] cpu: intel, amd: mask cleared cpuid features Vladimir Davydov
2012-07-20 17:10 ` Andi Kleen
2012-07-20 17:18 ` H. Peter Anvin
2012-07-25 11:51 ` Vladimir Davydov
2012-07-20 17:20 ` H. Peter Anvin
2012-07-20 18:21 ` Vladimir Davydov
2012-07-20 20:19 ` H. Peter Anvin
2012-07-20 20:37 ` Vladimir Davydov
2012-07-21 10:37 ` Borislav Petkov
2012-07-24 7:06 ` Vladimir Davydov
2012-07-24 7:48 ` Borislav Petkov
2012-07-24 8:14 ` Andre Przywara
2012-07-24 8:29 ` Vladimir Davydov
2012-07-24 10:10 ` Borislav Petkov [this message]
2012-07-24 11:09 ` Vladimir Davydov
2012-07-24 12:34 ` Andre Przywara
2012-07-24 12:44 ` Alan Cox
2012-07-25 10:31 ` Vladimir Davydov
2012-07-25 10:58 ` Andre Przywara
2012-07-25 11:02 ` Vladimir Davydov
2012-07-25 11:17 ` Andre Przywara
2012-07-25 11:43 ` Vladimir Davydov
2012-07-25 11:31 ` Alan Cox
2012-07-25 11:46 ` Vladimir Davydov
2012-07-25 10:31 ` Vladimir Davydov
2012-07-25 10:43 ` Borislav Petkov
2012-07-25 11:39 ` Vladimir Davydov
2012-07-25 0:57 ` H. Peter Anvin
2012-07-25 6:58 ` Vladimir Davydov
2012-07-25 14:13 ` H. Peter Anvin
2012-07-25 11:49 ` Vladimir Davydov
2012-07-24 9:50 ` Borislav Petkov
2012-07-24 10:32 ` Alan Cox
2012-07-24 11:04 ` Borislav Petkov
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