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Bug 887844 - AHCI does not support restarting requests (i.e. rerror=stop and werror=stop/enospc)
AHCI does not support restarting requests (i.e. rerror=stop and werror=stop/e...
Status: ON_QA
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm-rhev (Show other bugs)
Unspecified Unspecified
unspecified Severity unspecified
: rc
: ---
Assigned To: John Snow
Depends On: 953062
Blocks: 1227278 1305606 1313485
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Reported: 2012-12-17 08:02 EST by Paolo Bonzini
Modified: 2016-07-25 05:50 EDT (History)
9 users (show)

See Also:
Fixed In Version: qemu-kvm-rhev-2.5.0-1.el7
Doc Type: Bug Fix
Doc Text:
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Last Closed:
Type: Bug
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RHEL 7.3 requirements from Atomic Host:

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Description Paolo Bonzini 2012-12-17 08:02:26 EST
Description of problem:
AHCI provides a dummy implementation of restart_cb.  Hence, it will not properly restart after the VM is paused for an I/O error (including ENOSPC).

Version-Release number of selected component (if applicable):
Comment 4 John Snow 2015-04-06 20:04:23 EDT
The patches that enable this have gone upstream, but it's impossible to meaningfully test them without AHCI migration, so this issue is now blocked on #901631.
Comment 7 John Snow 2016-01-13 16:08:27 EST
Included in rebase to qemu 2.5.0.

Instructions for testing:

- Use -werror=stop or -rerror=stop
- Trigger an ENOSPC error either through blkdebug or a legitimate out of space error.
- Observe VM has paused.
- If not using BLKDEBUG method, correct ENOSPC issue
- Resume VM
- Observe that VM is running and transfer(s) have succeeded.

The qemu/tests/ahci-test suite already tests this workflow.

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