linux-kernel - Re: [PATCH] KVM: MMU: fix huge page adapted on non-PAE host

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Message-ID: <4FC4DBE6.1040703@redhat.com>
Date:	Tue, 29 May 2012 17:23:34 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH] KVM: MMU: fix huge page adapted on non-PAE host

On 05/28/2012 05:44 PM, Andrea Arcangeli wrote:
> On Mon, May 28, 2012 at 05:40:08PM +0300, Avi Kivity wrote:
>> Yes, I see it now.  Adjusting mask is incorrect since we won't have the
>> same adjustment on release.  I'll apply the patch for 3.5.
> 
> Sounds great to me. One thing I'm not sure about is about the real need of
> the mmio check vs a stright get_page (we shouldn't ever get to a gup-fast
> succeeding if this was a mmio region?) but I don't see chances that it
> could hurt either.

This is a device assignment mmio region.  gpu_fast() can succeed is we
happen to have a struct page for it (pci hole) or fail if we don't
(64-bit BAR).  See hva_to_pfn() (and indeed this is the reason we use
pfns instead of struct pages).

-- 
error compiling committee.c: too many arguments to function
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