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From: Anthony PERARD <anthony.perard@citrix.com>
To: Olaf Hering <olaf@aepfle.de>
Cc: xen-devel@lists.xenproject.org, "Wei Liu" <wei.liu2@citrix.com>,
	"Roger Pau Monné" <roger.pau@citrix.com>
Subject: Re: [Xen-devel] [PATCH qemu-xen 4.10 & 4.11] xen_disk: Disable file locking for the PV disk backend
Date: Wed, 5 Jun 2019 11:53:38 +0100	[thread overview]
Message-ID: <20190605105338.GH2126@perard.uk.xensource.com> (raw)
In-Reply-To: <20190523094148.GB2126@perard.uk.xensource.com>

On Thu, May 23, 2019 at 10:41:48AM +0100, Anthony PERARD wrote:
> On Wed, May 22, 2019 at 07:54:42PM +0200, Olaf Hering wrote:
> > Am Wed, 22 May 2019 15:51:40 +0100
> > schrieb Anthony PERARD <anthony.perard@citrix.com>:
> > 
> > > Can you give it a try with one of the affected qemu? (qemu-xen-4.10 or
> > > qemu-xen-4.11)
> > 
> > Thanks for the patch. Unfortunately there is no easy way to trigger the race.
> > Is the changed code path also exercised for PV domUs?
> 
> Yes! The code path is executed every time a disk is attached via the
> qdisk backend. So as long as guest can access the pv disk, then it's
> fine (for both HVM and PV domUs, and PVH).
> 
> Another way to make sure that the locking is disable is to attach a disk
> to a second guest, qemu should not complain anymore. I've tested both
> "raw" disk and "qcow2" disk but I'm not sure if other kind of disk needs
> to be tested.

Olaf, did you apply this patch and run some guest? Do they still boot?
It doesn't matter if you can't trigger the race with or without this
patch, I just want to know if there are any regression.
So, may have I your "Tested-by" ? And I will try to apply it to our
qemu-xen branches.

Thanks,

-- 
Anthony PERARD

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  reply	other threads:[~2019-06-05 10:54 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-22 14:51 [PATCH qemu-xen 4.10 & 4.11] xen_disk: Disable file locking for the PV disk backend Anthony PERARD
2019-05-22 14:51 ` [Xen-devel] " Anthony PERARD
2019-05-22 14:54 ` Wei Liu
2019-05-22 14:54   ` [Xen-devel] " Wei Liu
2019-05-22 17:54 ` Olaf Hering
2019-05-22 17:54   ` [Xen-devel] " Olaf Hering
2019-05-23  9:41   ` Anthony PERARD
2019-05-23  9:41     ` [Xen-devel] " Anthony PERARD
2019-06-05 10:53     ` Anthony PERARD [this message]
2019-06-14 13:23       ` Olaf Hering

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