From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Bob Liu <bob.liu@oracle.com>, <xen-devel@lists.xenproject.org>
Cc: <david.vrabel@citrix.com>, <linux-kernel@vger.kernel.org>,
<konrad.wilk@oracle.com>
Subject: Re: [PATCH v2 1/3] xen-blkfront: introduce blkfront_gather_backend_features()
Date: Thu, 23 Jul 2015 11:00:21 +0200 [thread overview]
Message-ID: <55B0AD25.6010904@citrix.com> (raw)
In-Reply-To: <1437547210-32573-1-git-send-email-bob.liu@oracle.com>
El 22/07/15 a les 8.40, Bob Liu ha escrit:
> There is a bug when migrate from !feature-persistent host to feature-persistent
> host, because domU still thinks new host/backend doesn't support persistent.
> Dmesg like:
> backed has not unmapped grant: 839
> backed has not unmapped grant: 773
> backed has not unmapped grant: 773
> backed has not unmapped grant: 773
> backed has not unmapped grant: 839
>
> The fix is to recheck feature-persistent of new backend in blkif_recover().
> See: https://lkml.org/lkml/2015/5/25/469
>
> As Roger suggested, we can split the part of blkfront_connect that checks for
> optional features, like persistent grants, indirect descriptors and
> flush/barrier features to a separate function and call it from both
> blkfront_connect and blkif_recover
>
> Signed-off-by: Bob Liu <bob.liu@oracle.com>
Acked-by: Roger Pau Monné <roger.pau@citrix.com>
prev parent reply other threads:[~2015-07-23 9:00 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-22 6:40 [PATCH v2 1/3] xen-blkfront: introduce blkfront_gather_backend_features() Bob Liu
2015-07-22 6:40 ` [PATCH v2 2/3] xen-blkfront: don't add indirect pages to list when !feature_persistent Bob Liu
2015-07-23 8:59 ` Roger Pau Monné
2015-07-22 6:40 ` [PATCH v2] xen-blkback: replace work_pending with work_busy in purge_persistent_gnt() Bob Liu
2015-07-23 9:06 ` Roger Pau Monné
2015-07-24 13:10 ` Konrad Rzeszutek Wilk
2015-07-23 9:00 ` Roger Pau Monné [this message]
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