[Qemu-devel] [PATCH v2 1/4] intel_iommu: fix VTD_PAGE_MASK

[Peter Xu <peterx@redhat.com>]

IOMMUTLBEntry.iova is returned incorrectly in 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 normal definition (normally it should
be pfn mask, not offset mask), then switch the other user of it.

Fixes: b93130 ("intel_iommu: cleanup vtd_{do_}iommu_translate()")
Signed-off-by: Peter Xu <peterx@redhat.com>
---
 hw/i386/intel_iommu.c          | 2 +-
 hw/i386/intel_iommu_internal.h | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 88dc042..392da45 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -1141,7 +1141,7 @@ static bool vtd_do_iommu_translate(VTDAddressSpace *vtd_as, PCIBus *bus,
     if (vtd_ce_get_type(&ce) == VTD_CONTEXT_TT_PASS_THROUGH) {
         entry->iova = addr & VTD_PAGE_MASK;
         entry->translated_addr = entry->iova;
-        entry->addr_mask = VTD_PAGE_MASK;
+        entry->addr_mask = ~VTD_PAGE_MASK;
         entry->perm = IOMMU_RW;
         trace_vtd_translate_pt(source_id, entry->iova);
 
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index f50ecd8..d1d6290 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -384,7 +384,7 @@ 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_MASK               ~(VTD_PAGE_SIZE - 1)
 
 #define VTD_PAGE_SHIFT_4K           12
 #define VTD_PAGE_MASK_4K            (~((1ULL << VTD_PAGE_SHIFT_4K) - 1))
-- 
2.7.4