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Re: [Xen-devel] Is: x86: mm: Fix vmalloc_fault oops during lazy MMU updates Was: Re: [PATCH] mm/x86: Flush lazy MMU when DEBUG_PAGEALLOC is set
- To: Borislav Petkov <bp@xxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>, mingo@xxxxxxxxxx, tglx@xxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, samu.kallio@xxxxxxxxxxxxxxxxx, kraman@xxxxxxxxxx, jwboyer@xxxxxxxxxx
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Thu, 28 Feb 2013 08:24:12 -0800
- Delivery-date: Thu, 28 Feb 2013 16:25:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
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
complexity.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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