Re: Is: x86: mm: Fix vmalloc_fault oops during lazy MMU updates Was:Re: [PATCH] mm/x86: Flush lazy MMU when DEBUG_PAGEALLOC is set

From: H. Peter Anvin
Date: Thu Feb 28 2013 - 11:25:49 EST

On 02/28/2013 08:22 AM, Borislav Petkov wrote:
> On Thu, Feb 28, 2013 at 11:20:20AM -0500, Boris Ostrovsky wrote:
>> On 02/28/2013 11:10 AM, Borislav Petkov wrote:
>>> On Thu, Feb 28, 2013 at 07:53:44AM -0800, H. Peter Anvin wrote:
>>>> At the very least we should have an early filter for the **COMMON!**
>>>> case that we are not on a PV platform.
>>> ... or, patch it out with the alternatives on baremetal, as Steven
>>> suggested.
>> I think making a check for paravirt_enabled() is safe enough. I'll
>> send a patch shortly.
> Why not make it absolutely for free?

That makes more sense, I think... although of course, there is a cost in


H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.

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