Cui, Dexuan
2008-Aug-26 12:46 UTC
[Xen-devel] [PATCH] vtd: do FLR before xc.domain_destroy()
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@intel.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel