From: "Dr. David Alan Gilbert (git)" <dgilbert@redhat.com>
To: qemu-devel@nongnu.org
Cc: pbonzini@redhat.com, jsnow@redhat.com
Subject: [Qemu-devel] [PATCH 0/2] ATAPI migration fix/hack
Date: Tue, 9 Dec 2014 18:15:07 +0000 [thread overview]
Message-ID: <1418148909-19870-1-git-send-email-dgilbert@redhat.com> (raw)
From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
This pair of patches fixes a problem where IDE/ATAPI cdrom
reads get lost/corrupted over migration.
The first of the patches (restore atapi_dma flag) is
a simple fix that I think is safe; it no longer causes
corruption in the case we saw, but does still trigger
a long timeout.
The second is a hack; it throws a medium error causing
the guest to retry the command in the case where migration
happens just between the IDE/ATAPI command being submitted
and the bmdma being finished. This recovers a lot
faster than the timeout.
Only tried on Linux guests so far; I think it might be possible
to replace both of these by reparsing the command buffer for
ATAPI; I'm just not confident I know when that's safe to do,
and I wanted to see how disgusted people were by the 2nd hack.
Dave
Dr. David Alan Gilbert (2):
Restore atapi_dma flag across migration
atapi migration: Throw recoverable error to avoid recovery
hw/ide/atapi.c | 17 +++++++++++++++++
hw/ide/core.c | 1 +
hw/ide/internal.h | 2 ++
hw/ide/pci.c | 11 +++++++++++
4 files changed, 31 insertions(+)
--
2.1.0
next reply other threads:[~2014-12-09 18:15 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-09 18:15 Dr. David Alan Gilbert (git) [this message]
2014-12-09 18:15 ` [Qemu-devel] [PATCH 1/2] Restore atapi_dma flag across migration Dr. David Alan Gilbert (git)
2014-12-10 5:04 ` John Snow
2014-12-09 18:15 ` [Qemu-devel] [PATCH 2/2] atapi migration: Throw recoverable error to avoid recovery Dr. David Alan Gilbert (git)
2014-12-10 6:14 ` John Snow
2014-12-10 12:05 ` Dr. David Alan Gilbert
2014-12-10 20:09 ` Dr. David Alan Gilbert
2014-12-10 22:04 ` Paolo Bonzini
2014-12-11 19:45 ` Dr. David Alan Gilbert
2014-12-18 19:39 ` Dr. David Alan Gilbert
2014-12-18 23:42 ` John Snow
2015-01-16 17:28 ` John Snow
2015-02-02 12:11 ` Kevin Wolf
2015-01-07 16:26 ` [Qemu-devel] [PATCH 0/2] ATAPI migration fix/hack Dr. David Alan Gilbert
2015-01-30 16:07 ` Dr. David Alan Gilbert
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