From: Ian Jackson <Ian.Jackson@eu.citrix.com>
To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Ian Campbell <Ian.Campbell@citrix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
George Dunlap <George.Dunlap@eu.citrix.com>,
xen-devel <xen-devel@lists.xen.org>,
Jan Beulich <JBeulich@suse.com>, Alex Bligh <alex@alex.org.uk>
Subject: Re: [PATCHv3] QEMU(upstream): Disable xen's use of O_DIRECT by default as it results in crashes.
Date: Thu, 14 Mar 2013 19:30:22 +0000 [thread overview]
Message-ID: <20802.9550.113423.377616@mariner.uk.xensource.com> (raw)
In-Reply-To: <alpine.DEB.2.02.1303141837150.22839@kaball.uk.xensource.com>
Stefano Stabellini writes ("Re: [PATCHv3] QEMU(upstream): Disable xen's use of O_DIRECT by default as it results in crashes."):
> On Fri, 8 Mar 2013, Alex Bligh wrote:
> > Due to what is almost certainly a kernel bug, writes with
> > O_DIRECT may continue to reference the page after the write
> > has been marked as completed, particularly in the case of
> > TCP retransmit. In other scenarios, this "merely" risks
> > data corruption on the write, but with Xen pages from domU
> > are only transiently mapped into dom0's memory, resulting
> > in kernel panics when they are subsequently accessed.
> >
> > This brings PV devices in line with emulated devices. Removing
> > O_DIRECT is safe as barrier operations are now correctly passed
> > through.
> >
> > See:
> > http://lists.xen.org/archives/html/xen-devel/2012-12/msg01154.html
> > for more details.
> >
> > Signed-off-by: Alex Bligh <alex@alex.org.uk>
>
>
> Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Marvellous, pushed to staging/qemu-upstream-unstable.git
Thanks,
Ian.
next prev parent reply other threads:[~2013-03-14 19:30 UTC|newest]
Thread overview: 119+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-14 14:54 Fatal crash on xen4.2 HVM + qemu-xen dm + NFS Alex Bligh
2012-12-17 10:10 ` Jan Beulich
2012-12-17 17:09 ` Alex Bligh
2013-01-16 10:56 ` Alex Bligh
2013-01-16 14:34 ` Stefano Stabellini
2013-01-16 15:06 ` Alex Bligh
2013-01-16 16:00 ` Alex Bligh
2013-01-16 16:27 ` Stefano Stabellini
2013-01-16 17:13 ` Alex Bligh
2013-01-16 17:33 ` Stefano Stabellini
2013-01-16 17:39 ` Stefano Stabellini
2013-01-16 18:14 ` Alex Bligh
2013-01-16 18:49 ` Stefano Stabellini
2013-01-16 19:00 ` Stefano Stabellini
2013-01-17 7:58 ` Alex Bligh
2013-01-16 18:12 ` Alex Bligh
2013-01-21 15:15 ` Alex Bligh
2013-01-21 15:23 ` Ian Campbell
2013-01-21 15:35 ` Alex Bligh
2013-01-21 15:50 ` Ian Campbell
2013-01-21 16:33 ` Alex Bligh
2013-01-21 16:51 ` Ian Campbell
2013-01-21 17:06 ` Alex Bligh
2013-01-21 17:29 ` Ian Campbell
2013-01-21 17:31 ` Alex Bligh
2013-01-21 17:32 ` Ian Campbell
2013-01-21 18:14 ` Alex Bligh
2013-01-22 10:05 ` Ian Campbell
2013-01-22 13:02 ` Alex Bligh
2013-01-22 13:13 ` Ian Campbell
2013-01-21 20:37 ` Alex Bligh
2013-01-22 10:07 ` Ian Campbell
2013-01-22 13:01 ` Alex Bligh
2013-01-22 13:14 ` Ian Campbell
2013-01-22 13:18 ` Alex Bligh
2013-01-22 10:13 ` Ian Campbell
2013-01-22 12:59 ` Alex Bligh
2013-01-22 15:46 ` Stefano Stabellini
2013-01-22 15:42 ` Stefano Stabellini
2013-01-22 16:09 ` Stefano Stabellini
2013-01-22 20:31 ` Alex Bligh
2013-01-23 11:52 ` Stefano Stabellini
2013-01-23 15:19 ` Alex Bligh
2013-01-23 16:29 ` Stefano Stabellini
2013-01-25 11:28 ` Alex Bligh
2013-02-05 15:40 ` Alex Bligh
2013-02-22 17:28 ` Alex Bligh
2013-02-22 17:41 ` Konrad Rzeszutek Wilk
2013-02-22 18:00 ` Stefano Stabellini
2013-02-22 19:53 ` Alex Bligh
2013-03-06 11:50 ` Alex Bligh
2013-03-07 1:01 ` Konrad Rzeszutek Wilk
2013-03-07 4:15 ` Stefano Stabellini
2013-03-07 10:47 ` [PATCH] QEMU(upstream): Disable xen's use of O_DIRECT by default as it results in crashes Alex Bligh
2013-03-08 3:18 ` Stefano Stabellini
2013-03-08 9:25 ` [PATCHv2] " Alex Bligh
2013-03-08 9:26 ` [PATCH] " Alex Bligh
2013-03-08 10:17 ` George Dunlap
2013-03-08 10:27 ` Alex Bligh
2013-03-08 10:35 ` George Dunlap
2013-03-08 10:50 ` Alex Bligh
2013-03-08 11:18 ` George Dunlap
2013-03-08 11:40 ` [PATCHv3] " Alex Bligh
2013-03-08 12:54 ` George Dunlap
2013-03-11 14:02 ` Alex Bligh
2013-03-11 14:42 ` George Dunlap
2013-03-11 17:48 ` Konrad Rzeszutek Wilk
2013-03-11 17:55 ` Ian Jackson
2013-03-14 17:06 ` Alex Bligh
2013-03-14 18:26 ` Ian Jackson
2013-03-12 12:08 ` Ian Campbell
2013-03-14 18:37 ` Stefano Stabellini
2013-03-14 19:30 ` Ian Jackson [this message]
2013-03-14 19:56 ` Alex Bligh
2013-03-15 9:28 ` Ian Campbell
2013-03-15 10:43 ` Stefano Stabellini
2013-03-15 11:21 ` Ian Jackson
2013-03-15 11:28 ` Stefano Stabellini
2013-03-15 11:37 ` Ian Jackson
2013-03-15 11:43 ` Stefano Stabellini
2013-03-15 12:43 ` Alex Bligh
2013-03-15 12:50 ` Ian Campbell
2013-03-15 18:31 ` Ian Jackson
2013-03-18 10:29 ` Alex Bligh
2013-03-18 11:47 ` Stefano Stabellini
2013-03-18 12:21 ` Alex Bligh
2013-03-08 11:41 ` [PATCH] " Alex Bligh
2013-03-08 10:28 ` George Dunlap
2013-03-08 10:45 ` Alex Bligh
2013-03-07 10:51 ` Fatal crash on xen4.2 HVM + qemu-xen dm + NFS Alex Bligh
2013-03-07 8:16 ` Alex Bligh
2013-03-18 12:18 [PATCHv3] QEMU(upstream): Disable xen's use of O_DIRECT by default as it results in crashes Alex Bligh
2013-03-18 13:32 ` [Qemu-devel] " Paolo Bonzini
2013-03-18 13:49 ` Alex Bligh
2013-03-18 14:05 ` Paolo Bonzini
2013-03-18 14:30 ` Alex Bligh
2013-03-18 14:49 ` Paolo Bonzini
2013-03-18 15:40 ` Alex Bligh
2013-03-18 15:40 ` [Qemu-devel] " Alex Bligh
2013-03-18 16:19 ` Paolo Bonzini
2013-03-18 16:19 ` [Qemu-devel] " Paolo Bonzini
2013-03-18 16:53 ` Alex Bligh
2013-03-18 17:38 ` George Dunlap
2013-03-18 17:47 ` Alex Bligh
2013-03-18 18:00 ` [Qemu-devel] " Paolo Bonzini
2013-03-19 10:06 ` George Dunlap
2013-03-19 10:06 ` [Qemu-devel] [Xen-devel] " George Dunlap
2013-03-19 10:43 ` Paolo Bonzini
2013-03-19 10:43 ` [Qemu-devel] [Xen-devel] " Paolo Bonzini
2013-03-19 10:51 ` George Dunlap
2013-03-19 11:14 ` Paolo Bonzini
2013-03-19 11:21 ` George Dunlap
2013-03-19 15:12 ` George Dunlap
2013-03-19 15:12 ` [Qemu-devel] [Xen-devel] " George Dunlap
2013-03-19 15:29 ` George Dunlap
2013-03-19 15:29 ` [Qemu-devel] [Xen-devel] " George Dunlap
2013-03-19 19:15 ` Alex Bligh
2013-03-20 10:24 ` Stefano Stabellini
2013-03-20 10:37 ` George Dunlap
2013-03-20 11:08 ` Paolo Bonzini
2013-03-20 11:20 ` Alex Bligh
2013-03-20 11:08 ` Paolo Bonzini
2013-03-19 11:44 ` [Qemu-devel] [Xen-devel] " Alex Bligh
2013-03-19 11:49 ` Paolo Bonzini
2013-03-19 11:44 ` Alex Bligh
2013-03-19 11:14 ` Paolo Bonzini
2013-03-19 10:51 ` George Dunlap
2013-03-19 15:13 ` [Qemu-devel] [Xen-devel] " Stefano Stabellini
2013-03-19 16:53 ` Paolo Bonzini
2013-03-19 17:03 ` Stefano Stabellini
2013-03-19 16:53 ` Paolo Bonzini
2013-03-20 8:33 ` Alex Bligh
2013-03-20 9:26 ` [Qemu-devel] [Xen-devel] " Paolo Bonzini
2013-03-29 17:19 ` Stefano Stabellini
2013-03-31 19:53 ` Alex Bligh
2013-03-31 19:53 ` [Qemu-devel] [Xen-devel] " Alex Bligh
2013-04-01 16:35 ` Alex Bligh
2013-03-20 9:26 ` Paolo Bonzini
2013-03-19 15:13 ` Stefano Stabellini
2013-03-18 18:00 ` Paolo Bonzini
2013-03-18 14:49 ` Paolo Bonzini
2013-03-18 13:32 ` Paolo Bonzini
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