amd_iommu: Fix the calculation for Device Table size

Correctly calculate the Device Table size using the format encoded in the
Device Table Base Address Register (MMIO Offset 0000h).

Cc: [email protected]
Fixes: d29a09c ("hw/i386: Introduce AMD IOMMU")
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 67d3077ee403472d45794399e97c9f329242fce9)
Signed-off-by: Michael Tokarev <[email protected]>

Author: aljimenezb

hw/i386/amd_iommu.c

@@ -665,8 +665,8 @@ static inline void amdvi_handle_devtab_write(AMDVIState *s)
     uint64_t val = amdvi_readq(s, AMDVI_MMIO_DEVICE_TABLE);
     s->devtab = (val & AMDVI_MMIO_DEVTAB_BASE_MASK);
 
-    /* set device table length */
-    s->devtab_len = ((val & AMDVI_MMIO_DEVTAB_SIZE_MASK) + 1 *
+    /* set device table length (i.e. number of entries table can hold) */
+    s->devtab_len = (((val & AMDVI_MMIO_DEVTAB_SIZE_MASK) + 1) *
                     (AMDVI_MMIO_DEVTAB_SIZE_UNIT /
                      AMDVI_MMIO_DEVTAB_ENTRY_SIZE));
 }