[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] vtd: Don't do FLR when we create domain or hotplug device into guest.
# HG changeset patch # User Keir Fraser <keir.fraser@xxxxxxxxxx> # Date 1219139501 -3600 # Node ID 7c10be016e432163c8d95a9d5a79636ff6133e93 # Parent 2af894d8cecd04ae8bdf298172c5196df42e2f3f vtd: Don't do FLR when we create domain or hotplug device into guest. VT-d hot-plug is done in such a way: 1) xend sends 'pci-ins' command to ioemu via xenstore; 2) ioemu creates pass-through device and raises SCI to guest OS; guest OS loads device driver, and device driver initializes the hot-plugged device; 3) xend does FLR. There is a race condition about 2) and 3). If 3) runs slow, we have troubles. Thanks for Yuji Shimada's locating the issues. We can work around the issues by not doing FLR when we create domain or hotplug device into guest, namely, we only do FLR when we destroy domain or hotplug device from guest. Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx> Signed-off-by: Dongxiao Xu <dongxiao.xu@xxxxxxxxx> --- tools/python/xen/xend/server/pciif.py | 8 ++++++-- 1 files changed, 6 insertions(+), 2 deletions(-) diff -r 2af894d8cecd -r 7c10be016e43 tools/python/xen/xend/server/pciif.py --- a/tools/python/xen/xend/server/pciif.py Tue Aug 19 10:48:39 2008 +0100 +++ b/tools/python/xen/xend/server/pciif.py Tue Aug 19 10:51:41 2008 +0100 @@ -290,8 +290,12 @@ class PciController(DevController): self.CheckSiblingDevices(fe_domid, dev) - if arch.type != "ia64": - dev.do_FLR() + # We don't do FLR when we create domain and hotplug device into guest, + # namely, we only do FLR when we destroy domain or hotplug device from + # guest. This is mainly to work around the race condition in hotplug code + # paths. See the changeset's description for details. + # if arch.type != "ia64": + # dev.do_FLR() PCIQuirk(dev.vendor, dev.device, dev.subvendor, dev.subdevice, domain, bus, slot, func) _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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