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[Qemu-devel] [Question] virtio-serial misses irq delivery on migration?


From: Gonglei (Arei)
Subject: [Qemu-devel] [Question] virtio-serial misses irq delivery on migration?
Date: Fri, 5 Aug 2016 09:14:24 +0000

Hi Paolo , Jan, Amit

Recently we encountered a problem that the virtio-serial can't work after
Migration in RH5.5 VM. The bigger problem is, I can't reproduce it. :(

It's phenomenon was much like BZ 867366, the usb-table mouse didn't work because
the uhci and virtio-serial shard the irq line (using IOAPIC, not MSI). The new 
interrupt
can't be injected to VM because the irq line bit had been set to 1, but the 
frontend
driver never handle it or never know it.

 Bug 867366 - virtio-serial misses irq delivery on migration
https://bugzilla.redhat.com/show_bug.cgi?id=867366

But my qemu is the newest qemu, Both commit 80dcfb8532"virtio-serial-bus: 
post_load
send_event when vm is running" and commit bc6b815d9e " virtio-serial: propagate 
guest_connected to the port on post_load" are applied.

I noticed that Paolo posted another problem maybe have a pertential problem 
about
apic in Comment 23. But this patch
 https://bugzilla.redhat.com/attachment.cgi?id=635535&action=diff
haven't merged into qemu master.

Would you give me some clues please? Thanks!

Regards,
-Gonglei





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