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Date: Tue, 19 Feb 2013 10:21:03 -0800 From: "H. Peter Anvin" <hpa@...or.com> To: Boris Ostrovsky <boris.ostrovsky@...cle.com> CC: Ingo Molnar <mingo@...nel.org>, Konrad Rzeszutek Wilk <konrad@...nel.org>, Borislav Petkov <bp@...en8.de>, Linus Torvalds <torvalds@...ux-foundation.org>, linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: [GIT PULL] x86/cpu changes for v3.9 On 02/19/2013 10:19 AM, Boris Ostrovsky wrote: > On 02/19/2013 12:57 PM, Konrad Rzeszutek Wilk wrote: >> On Tue, Feb 19, 2013 at 06:47:58PM +0100, Borislav Petkov wrote: >>> On Tue, Feb 19, 2013 at 09:38:31AM -0800, H. Peter Anvin wrote: >>>> 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? >>> I don't think Boris O. is at AMD anymore. Want me to add that to my fix >>> for kvm or prep a separate patch? >> CC-ing Boris. > > BorisP's patch is what I should have done. Can you take it? > As I stated: >>>> 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. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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