From: George Dunlap <George.Dunlap@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>,
Alex Bligh <alex@alex.org.uk>,
Ian Jackson <Ian.Jackson@eu.citrix.com>,
xen-devel <xen-devel@lists.xen.org>,
Jan Beulich <JBeulich@suse.com>
Subject: Re: [PATCH] QEMU(upstream): Disable xen's use of O_DIRECT by default as it results in crashes.
Date: Fri, 8 Mar 2013 10:28:32 +0000 [thread overview]
Message-ID: <CAFLBxZafDUSdP+hyzmiU0GsH9ch8S21CvZgEvwnVGsKDSiwezA@mail.gmail.com> (raw)
In-Reply-To: <CAFLBxZbUKHA0Yt=zHCunNoHpm4xsjkucu6UoH7yomCqj8EqKJQ@mail.gmail.com>
On Fri, Mar 8, 2013 at 10:17 AM, George Dunlap
<George.Dunlap@eu.citrix.com> wrote:
>> I would just remove use_o_direct and BDRV_O_NOCACHE altogether
>
> Wait, aren't O_DIRECT and BDRV_O_NOCACHE required for safety? That
> is, without these flags isn't it possible that the guest OS thinks
> that the data has made it onto stable storage, while in fact it's
> still in dom0's memory? Or am I missing something?
And in any case, if it's a kernel bug it should be fixed in the kernel.
Alex, which dom0 kernel are you using? I actually seem to recall this
being a long-known bug with some versions of the pvops kernels; but I
thought it had long since been fixed. Kondrad / IanC, can you
comment?
Alex, if that's the case and if you're using a distro kernel maybe you
should try to push for a backport?
-George
next prev parent reply other threads:[~2013-03-08 10:28 UTC|newest]
Thread overview: 91+ 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
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 [this message]
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
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