[PATCH] intel-iommu: fix Read DMAR IQA REG DW

[YeeLi]

From: yeeli <seven.yi.lee@gmail.com>

When dmar_readq or devmem2 read the DW of IQA always 0UL because
"& VTD_IQA_QS". So, try to fix it.

case:
after vtd_mem_write
IQA val: 0x100206801

after vtd_mem_read
IQA val: 0x100206001

Signed-off-by: yeeli <seven.yi.lee@gmail.com>
---
 hw/i386/intel_iommu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 37c21a0aec..e230a45940 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2938,7 +2938,8 @@ static uint64_t vtd_mem_read(void *opaque, hwaddr addr, 
unsigned size)
 
     /* Invalidation Queue Address Register, 64-bit */
     case DMAR_IQA_REG:
-        val = s->iq | (vtd_get_quad(s, DMAR_IQA_REG) & VTD_IQA_QS);
+        val = s->iq | (vtd_get_quad(s, DMAR_IQA_REG) & VTD_IQA_QS
+                | VTD_IQA_DW_MASK);
         if (size == 4) {
             val = val & ((1ULL << 32) - 1);
         }
-- 
2.34.1