[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

  • To: "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx>
  • Date: Tue, 26 Aug 2008 20:46:45 +0800
  • Cc:
  • Delivery-date: Tue, 26 Aug 2008 05:47:12 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AckHV5pNtSDwn0X/RJWR7X0J314ulQAIDdPg
  • Thread-topic: [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@xxxxxxxxx>


Attachment: fix_panic_wb.patch
Description: fix_panic_wb.patch

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.