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[PULL,04/10] intel_iommu: fix iova for pt

Message ID 1501623438-31419-5-git-send-email-mst@redhat.com
State New
Headers show

Commit Message

Michael S. Tsirkin Aug. 1, 2017, 9:37 p.m. UTC 
From: Peter Xu <peterx@redhat.com>

IOMMUTLBEntry.iova is returned incorrectly on one PT path (though mostly
we cannot really trigger this path, even if we do, we are mostly
disgarding this value, so it didn't break anything). Fix it by
converting the VTD_PAGE_MASK into the correct definition
VTD_PAGE_MASK_4K, then remove VTD_PAGE_MASK.

Fixes: b93130 ("intel_iommu: cleanup vtd_{do_}iommu_translate()")
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>
---
 hw/i386/intel_iommu_internal.h | 1 -
 hw/i386/intel_iommu.c          | 4 ++--
 2 files changed, 2 insertions(+), 3 deletions(-)
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Patch

diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index f50ecd8..0e73a65 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -384,7 +384,6 @@  typedef struct VTDIOTLBPageInvInfo VTDIOTLBPageInvInfo;
 /* Pagesize of VTD paging structures, including root and context tables */
 #define VTD_PAGE_SHIFT              12
 #define VTD_PAGE_SIZE               (1ULL << VTD_PAGE_SHIFT)
-#define VTD_PAGE_MASK               (VTD_PAGE_SIZE - 1)
 
 #define VTD_PAGE_SHIFT_4K           12
 #define VTD_PAGE_MASK_4K            (~((1ULL << VTD_PAGE_SHIFT_4K) - 1))
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index e398746..e0b0498 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1139,9 +1139,9 @@  static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
      * Also, let's ignore IOTLB caching as well for PT devices.
      */
     if (vtd_ce_get_type(&ce) == VTD_CONTEXT_TT_PASS_THROUGH) {
-        entry->iova = addr & VTD_PAGE_MASK;
+        entry->iova = addr & VTD_PAGE_MASK_4K;
         entry->translated_addr = entry->iova;
-        entry->addr_mask = VTD_PAGE_MASK;
+        entry->addr_mask = ~VTD_PAGE_MASK_4K;
         entry->perm = IOMMU_RW;
         trace_vtd_translate_pt(source_id, entry->iova);