linux-kernel - Re: [PATCH v4 RESEND 4/11] x86/asm: Fix pud/pmd interfaces to handle large PAT bit

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Message-ID: <1447116034.21443.41.camel@hpe.com>
Date:	Mon, 09 Nov 2015 17:40:34 -0700
From:	Toshi Kani <toshi.kani@....com>
To:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	hpa@...or.com, tglx@...utronix.de, mingo@...hat.com,
	akpm@...ux-foundation.org, bp@...en8.de, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, x86@...nel.org, jgross@...e.com,
	konrad.wilk@...cle.com, elliott@....com
Subject: Re: [PATCH v4 RESEND 4/11] x86/asm: Fix pud/pmd interfaces to
 handle large PAT bit

On Mon, 2015-11-09 at 16:18 -0700, Toshi Kani wrote:
> On Mon, 2015-11-09 at 17:36 -0500, Boris Ostrovsky wrote:
> > On 11/09/2015 03:47 PM, Kirill A. Shutemov wrote:
> > > On Mon, Nov 09, 2015 at 02:39:31PM -0500, Boris Ostrovsky wrote:
> > > > On 11/09/2015 02:16 PM, Toshi Kani wrote:
 :
> > > > 
> > > > FWIW, it looks like pmd_pfn_mask() inline is causing this. Reverting it
> > > > alone makes this crash go away.
> > > Could you check the patch below?
> > 
> > 
> > I does fix the problem on baremetal, thanks. My 32-bit Xen guests still 
> > fail which I thought was the same issue but now that I looked at it more 
> > carefully it has different signature.
> 
> I do not think Xen is hitting this, but I think page_level_mask() has the same
> issue for a long time.  I will set up 32-bit env on a system with >4GB memory 
> to verify this.

As Kirill explained me in his code review comment for *PAGE_MASK, page_level_mas
k() is fine as it is used for virtual addresses.

-Toshi  
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