[PATCH 2/3] hw/nvme: fix disable pi checks for Type 3 protection

[Ankit Kumar <ankit.kumar@samsung.com>]

As per the NVM command set specification, the protection information
checks for Type 3 protection are disabled, only when both application
and reference tag have all bits set to 1.

Signed-off-by: Ankit Kumar <ankit.kumar@samsung.com>
---
 hw/nvme/dif.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/nvme/dif.c b/hw/nvme/dif.c
index 01b19c3373..f9bd29a2a6 100644
--- a/hw/nvme/dif.c
+++ b/hw/nvme/dif.c
@@ -157,7 +157,8 @@ static uint16_t nvme_dif_prchk_crc16(NvmeNamespace *ns, NvmeDifTuple *dif,
 {
     switch (NVME_ID_NS_DPS_TYPE(ns->id_ns.dps)) {
     case NVME_ID_NS_DPS_TYPE_3:
-        if (be32_to_cpu(dif->g16.reftag) != 0xffffffff) {
+        if ((be32_to_cpu(dif->g16.reftag) != 0xffffffff) ||
+            (be16_to_cpu(dif->g16.apptag) != 0xffff)) {
             break;
         }
 
@@ -225,7 +226,7 @@ static uint16_t nvme_dif_prchk_crc64(NvmeNamespace *ns, NvmeDifTuple *dif,
 
     switch (NVME_ID_NS_DPS_TYPE(ns->id_ns.dps)) {
     case NVME_ID_NS_DPS_TYPE_3:
-        if (r != 0xffffffffffff) {
+        if (r != 0xffffffffffff || (be16_to_cpu(dif->g64.apptag) != 0xffff)) {
             break;
         }
 
-- 
2.25.1