[Xen-devel] [PATCH] vtd: do FLR before xc.domain_destroy()

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

When we "xm destroy" a guest with assigned devices, in
xen/common/domain.c:domain_kill(), we relinquish guest's memory first,
then invoke domain_destroy() -> complete_domain_destroy() ->
arch_domain_destroy() -> pci_release_devices()/iommu_domain_destroy().
 
Between relinquish_memory() and domain_destroy(), a device may be
issuing DMA request and access guest's relinquished  memory.
 
We can do_FLR() to quiesce devices before xc.domain_destroy().
 
Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>

Attachment: fix_panic_wb.patch
Description: fix_panic_wb.patch

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