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* [Qemu-devel] [PATCH v2] blockdev: reset werror/rerror on drive_del
@ 2013-06-05  8:33 Stefan Hajnoczi
  2013-06-05  9:00 ` Kevin Wolf
  2013-06-05 14:41 ` Stefan Hajnoczi
  0 siblings, 2 replies; 4+ messages in thread
From: Stefan Hajnoczi @ 2013-06-05  8:33 UTC (permalink / raw)
  To: qemu-devel
  Cc: Kevin Wolf, dron, Markus Armbruster, Stefan Hajnoczi,
	Paolo Bonzini

Paolo Bonzini <pbonzini@redhat.com> suggested the following test case:

1. Launch a guest and wait at the GRUB boot menu:

  qemu-system-x86_64 -enable-kvm -m 1024 \
   -drive if=none,cache=none,file=test.img,id=foo,werror=stop,rerror=stop
   -device virtio-blk-pci,drive=foo,id=virtio0,addr=4

2. Hot unplug the device:

  (qemu) drive_del foo

3. Select the first boot menu entry

Without this patch the guest pauses due to ENOMEDIUM.  The guest is
stuck in a continuous pause loop since the I/O request is retried and
fails immediately again when the guest is resumed.

With this patch the error is reported to the guest.

Note that this scenario actually happens sometimes during libvirt disk
hot unplug, where device_del is followed by drive_del.  I/O may still be
submitted to the drive after drive_del if the guest does not process the
PCI hot unplug notification.

Reported-by: Dafna Ron <dron@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 blockdev.c      | 4 ++++
 hmp-commands.hx | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index d1ec99a..6eb81a3 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1180,6 +1180,10 @@ int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
      */
     if (bdrv_get_attached_dev(bs)) {
         bdrv_make_anon(bs);
+
+        /* Further I/O must not pause the guest */
+        bdrv_set_on_error(bs, BLOCKDEV_ON_ERROR_REPORT,
+                          BLOCKDEV_ON_ERROR_REPORT);
     } else {
         drive_uninit(drive_get_by_blockdev(bs));
     }
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 9cea415..4f5a3fd 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -185,6 +185,8 @@ Remove host block device.  The result is that guest generated IO is no longer
 submitted against the host device underlying the disk.  Once a drive has
 been deleted, the QEMU Block layer returns -EIO which results in IO
 errors in the guest for applications that are reading/writing to the device.
+These errors are always reported to the guest, regardless of the drive's error
+actions (drive options rerror, werror).
 ETEXI
 
     {
-- 
1.8.1.4

^ permalink raw reply related	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2013-06-05 14:41 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2013-06-05  8:33 [Qemu-devel] [PATCH v2] blockdev: reset werror/rerror on drive_del Stefan Hajnoczi
2013-06-05  9:00 ` Kevin Wolf
2013-06-05 11:27   ` Stefan Hajnoczi
2013-06-05 14:41 ` Stefan Hajnoczi

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