amd_iommu: Fix mask to retrieve Interrupt Table Root Pointer from DTE

Fix an off-by-one error in the definition of AMDVI_IR_PHYS_ADDR_MASK. The
current definition masks off the most significant bit of the Interrupt Table
Root ptr i.e. it only generates a mask with bits [50:6] set. See the AMD I/O
Virtualization Technology (IOMMU) Specification for the Interrupt Table
Root Pointer[51:6] field in the Device Table Entry format.

Cc: [email protected]
Fixes: b44159f ("x86_iommu/amd: Add interrupt remap support when VAPIC is not enabled")
Signed-off-by: Alejandro Jimenez <[email protected]>
Reviewed-by: Vasant Hegde <[email protected]>
Message-Id: <[email protected]>
Reviewed-by: Michael S. Tsirkin <[email protected]>
Signed-off-by: Michael S. Tsirkin <[email protected]>
(cherry picked from commit 123cf4bdd378f746dfa2f5415ba084148dded3e3)
Signed-off-by: Michael Tokarev <[email protected]>

Author: aljimenezb

hw/i386/amd_iommu.h

@@ -231,7 +231,7 @@
 #define AMDVI_IR_INTCTL_PASS            1
 #define AMDVI_IR_INTCTL_REMAP           2
 
-#define AMDVI_IR_PHYS_ADDR_MASK         (((1ULL << 45) - 1) << 6)
+#define AMDVI_IR_PHYS_ADDR_MASK         GENMASK64(51, 6)
 
 /* MSI data 10:0 bits (section 2.2.5.1 Fig 14) */
 #define AMDVI_IRTE_OFFSET               0x7ff