From: Peter Xu <peterx@redhat.com>
Date: Tue, 29 Nov 2016 05:43:40 +0000 (+0800)
Subject: intel_iommu: fix incorrect device invalidate
X-Git-Tag: qemu-xen-4.9.0-rc1~27^2~3
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=6cb99acc2808cc41e2d772a23e9cc564515535cc;p=qemu-xen.git

intel_iommu: fix incorrect device invalidate

"mask" needs to be inverted before use.

Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 1b706adf9d..5f3e35123d 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -988,6 +988,7 @@ static void vtd_context_device_invalidate(IntelIOMMUState *s,
         mask = 7;   /* Mask bit 2:0 in the SID field */
         break;
     }
+    mask = ~mask;
     VTD_DPRINTF(INV, "device-selective invalidation source 0x%"PRIx16
                     " mask %"PRIu16, source_id, mask);
     vtd_bus = vtd_find_as_from_bus_num(s, VTD_SID_TO_BUS(source_id));