[PATCH 1/1] hw/i386/amd_iommu: Fix IOMMU event log encoding errors

[Wei Huang <wei.huang2@amd.com>]

Coverity issues several UNINIT warnings against AMD IOMMU device [1]. This
patch fixes them by initializing the variables. On top of it, this patch
changes the event log size to 16 bytes per IOMMU specification. Also the
event encoding function incorrectly defines the format of event log entry,
which is also fixed.

[1] CID 1487116/1487200/1487190/1487232/1487115/1487258

Reported-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
---
 hw/i386/amd_iommu.c | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)

diff --git a/hw/i386/amd_iommu.c b/hw/i386/amd_iommu.c
index ea8eaeb330b6..0f7f8929a687 100644
--- a/hw/i386/amd_iommu.c
+++ b/hw/i386/amd_iommu.c
@@ -208,8 +208,8 @@ static void amdvi_encode_event(uint64_t *evt, uint16_t devid, uint64_t addr,
                                uint16_t info)
 {
     amdvi_setevent_bits(evt, devid, 0, 16);
-    amdvi_setevent_bits(evt, info, 55, 8);
-    amdvi_setevent_bits(evt, addr, 63, 64);
+    amdvi_setevent_bits(evt, info, 48, 16);
+    amdvi_setevent_bits(evt, addr, 64, 64);
 }
 /* log an error encountered during a page walk
  *
@@ -218,7 +218,7 @@ static void amdvi_encode_event(uint64_t *evt, uint16_t devid, uint64_t addr,
 static void amdvi_page_fault(AMDVIState *s, uint16_t devid,
                              hwaddr addr, uint16_t info)
 {
-    uint64_t evt[4];
+    uint64_t evt[2] = { 0 };
 
     info |= AMDVI_EVENT_IOPF_I | AMDVI_EVENT_IOPF;
     amdvi_encode_event(evt, devid, addr, info);
@@ -234,7 +234,7 @@ static void amdvi_page_fault(AMDVIState *s, uint16_t devid,
 static void amdvi_log_devtab_error(AMDVIState *s, uint16_t devid,
                                    hwaddr devtab, uint16_t info)
 {
-    uint64_t evt[4];
+    uint64_t evt[2] = { 0 };
 
     info |= AMDVI_EVENT_DEV_TAB_HW_ERROR;
 
@@ -248,7 +248,8 @@ static void amdvi_log_devtab_error(AMDVIState *s, uint16_t devid,
  */
 static void amdvi_log_command_error(AMDVIState *s, hwaddr addr)
 {
-    uint64_t evt[4], info = AMDVI_EVENT_COMMAND_HW_ERROR;
+    uint64_t evt[2] = { 0 };
+    uint16_t info = AMDVI_EVENT_COMMAND_HW_ERROR;
 
     amdvi_encode_event(evt, 0, addr, info);
     amdvi_log_event(s, evt);
@@ -261,7 +262,7 @@ static void amdvi_log_command_error(AMDVIState *s, hwaddr addr)
 static void amdvi_log_illegalcom_error(AMDVIState *s, uint16_t info,
                                        hwaddr addr)
 {
-    uint64_t evt[4];
+    uint64_t evt[2] = { 0 };
 
     info |= AMDVI_EVENT_ILLEGAL_COMMAND_ERROR;
     amdvi_encode_event(evt, 0, addr, info);
@@ -276,7 +277,7 @@ static void amdvi_log_illegalcom_error(AMDVIState *s, uint16_t info,
 static void amdvi_log_illegaldevtab_error(AMDVIState *s, uint16_t devid,
                                           hwaddr addr, uint16_t info)
 {
-    uint64_t evt[4];
+    uint64_t evt[2] = { 0 };
 
     info |= AMDVI_EVENT_ILLEGAL_DEVTAB_ENTRY;
     amdvi_encode_event(evt, devid, addr, info);
@@ -288,7 +289,7 @@ static void amdvi_log_illegaldevtab_error(AMDVIState *s, uint16_t devid,
 static void amdvi_log_pagetab_error(AMDVIState *s, uint16_t devid,
                                     hwaddr addr, uint16_t info)
 {
-    uint64_t evt[4];
+    uint64_t evt[2] = { 0 };
 
     info |= AMDVI_EVENT_PAGE_TAB_HW_ERROR;
     amdvi_encode_event(evt, devid, addr, info);
-- 
2.35.1