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From: Greg KH on 19 Feb 2010 12:10
2.6.32-stable review patch. If anyone has any objections, please let us know.

------------------


From: Joerg Roedel <joerg.roedel(a)amd.com>

commit d3ad9373b7c29b63d5e8460a69453718d200cc3b upstream.

Deassigning a device from the passthrough domain does not
work and breaks device assignment to kvm guests. This patch
fixes the issue.

Signed-off-by: Joerg Roedel <joerg.roedel(a)amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)suse.de>

---
arch/x86/kernel/amd_iommu.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1230,9 +1230,10 @@ static void __detach_device(struct prote

/*
* If we run in passthrough mode the device must be assigned to the
- * passthrough domain if it is detached from any other domain
+ * passthrough domain if it is detached from any other domain.
+ * Make sure we can deassign from the pt_domain itself.
*/
- if (iommu_pass_through) {
+ if (iommu_pass_through && domain != pt_domain) {
struct amd_iommu *iommu = amd_iommu_rlookup_table[devid];
__attach_device(iommu, pt_domain, devid);
}


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