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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [XEN PATCH for-4.13] libxl_pci: Don't hold QMP connection while waiting
On 08/11/2019 07:07, Jürgen Groß wrote: > On 31.10.19 13:17, Anthony PERARD wrote: >> After sending the 'device_del' command for a PCI passthrough device, >> we wait until QEMU has effectively deleted the device, this involves >> executing more QMP commands. While waiting, libxl hold the connection. >> >> It isn't necessary to hold the connection and it prevents others from >> making progress, so this patch releases the QMP connection. >> >> For background: >> e.g., when a guest is created with several pci passthrough >> attached, on `xl destroy` all the devices needs to be detach, and >> this is usually what happens: >> - 'device_del' called for the 1st pci device >> - 'query-pci' checking if pci still there, it is >> - wait 1s >> - 'query-pci' checking again, and it's gone >> -> now the same can be done for the second pci device, so >> plenty of waiting on others when pci detach can be done in >> parallel. >> >> On shutdown, libxl usually keeps waiting because QEMU never >> releases the device because the guest kernel never responds QEMU's >> unplug queries. So detaching of the 1st device waits until a >> timeout stops it, and since the same timeout is setup at the same >> time for the other devices to detach, the 'device_del' command is >> never sent for those. >> >> Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> > > Release-acked-by: Juergen Gross <jgross@xxxxxxxx> > > > Juergen Hi Juergen, Since a lot more recent patches have been committed, but these don't seem to. I was wondering if this one fell through the cracks. -- Sander _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxxx https://lists.xenproject.org/mailman/listinfo/xen-devel
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