From mboxrd@z Thu Jan 1 00:00:00 1970 From: Keir Fraser Subject: Re: Grant Tables & mm.c Date: Wed, 04 Jul 2007 11:20:35 +0100 Message-ID: References: <843247.49816.qm@web94111.mail.in2.yahoo.com> Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============2146799696==" Return-path: In-Reply-To: <843247.49816.qm@web94111.mail.in2.yahoo.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Mime-version: 1.0 Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Koripella Srinivas , xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --===============2146799696== Content-type: multipart/alternative; boundary="B_3266392835_2315817" > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3266392835_2315817 Content-type: text/plain; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable You must explicitly unmap grants. So the domain which uses GNTTABOP_map_grant_ref must subsequently unmap it with GNTTABOP_unmap_grant_ref. You cannot just zap the pte! -- Keir On 4/7/07 11:16, "Koripella Srinivas" wrote: > Hi, > I am using grant tables to set up a shared memory between two guests. > One problem i am facing is that as soon as the shared memory is set up on= e of > the domain crashes with the log message > "Attempt to implicitly unmap a granted PTE". > the message is from function "put_page_from_l1e" in mm.c(arch/x86). >=20 > what could be the reason? Any pointers would be of great help >=20 >=20 >=20 >=20 > Here=B9s a new way to find what you're looking for - Yahoo! Answers > >=20 > _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel --B_3266392835_2315817 Content-type: text/html; charset="ISO-8859-1" Content-transfer-encoding: quoted-printable Re: [Xen-devel] Grant Tables  & mm.c You m= ust explicitly unmap grants. So the domain which uses GNTTABOP_map_grant_ref= must subsequently unmap it with GNTTABOP_unmap_grant_ref. You cannot just z= ap the pte!

 -- Keir

On 4/7/07 11:16, "Koripella Srinivas" <talkwithsrinivas@yahoo.= co.in> wrote:

Hi,
I am using grant tables to set up a shared memory between two guests.
One problem i am facing is that as soon as the shared memory is set up one = of the domain crashes with the log message
 "Attempt to implicitly unmap a granted PTE".
the message is from function "put_page_from_l1e" in mm.c(arch/x86= ).

what could be the reason? Any pointers would be of great help



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