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xen
23746-vtd-cleanup-timers.patch
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File 23746-vtd-cleanup-timers.patch of Package xen
# HG changeset patch # User Tim Deegan <Tim.Deegan@citrix.com> # Date 1311608493 -3600 # Node ID aa54b8175954bd6ffeb3bcf72e782e133896b388 # Parent 9dbbf1631193bb6df679f5eaaee192ef4ef91fd9 VT-d: always clean up dpci timers. If a VM has all its PCI devices deassigned, need_iommu(d) becomes false but it might still have DPCI EOI timers that were init_timer()d but not yet kill_timer()d. That causes xen to crash later because the linked list of inactive timers gets corrupted, e.g.: (XEN) Xen call trace: (XEN) [<ffff82c480126256>] set_timer+0x1c2/0x24f (XEN) [<ffff82c48011fbf8>] schedule+0x129/0x5dd (XEN) [<ffff82c480122c1e>] __do_softirq+0x7e/0x89 (XEN) [<ffff82c480122c9d>] do_softirq+0x26/0x28 (XEN) [<ffff82c480153c85>] idle_loop+0x5a/0x5c (XEN) (XEN) (XEN) **************************************** (XEN) Panic on CPU 0: (XEN) Assertion 'entry->next->prev == entry' failed at /local/scratch/tdeegan/xen-unstable.hg/xen/include:172 (XEN) **************************************** The following patch makes sure that the domain destruction path always clears up the DPCI state even if !needs_iommu(d). Signed-off-by: Tim Deegan <Tim.Deegan@citrix.com> --- a/xen/drivers/passthrough/pci.c +++ b/xen/drivers/passthrough/pci.c @@ -249,9 +249,6 @@ static void pci_clean_dpci_irqs(struct d if ( !iommu_enabled ) return; - if ( !need_iommu(d) ) - return; - spin_lock(&d->event_lock); hvm_irq_dpci = domain_get_irq_dpci(d); if ( hvm_irq_dpci != NULL )
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