[PATCH v3 4/4] hw/block/nvme: Align I/O BAR to 4 KiB

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

Simplify the NVMe emulated device by aligning the I/O BAR to 4 KiB.

Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
 include/block/nvme.h | 2 ++
 hw/block/nvme.c      | 5 ++---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/include/block/nvme.h b/include/block/nvme.h
index 82c384614a..4e1cea576a 100644
--- a/include/block/nvme.h
+++ b/include/block/nvme.h
@@ -22,6 +22,7 @@ typedef struct QEMU_PACKED NvmeBar {
     uint32_t    pmrebs;
     uint32_t    pmrswtp;
     uint64_t    pmrmsc;
+    uint8_t     reserved[484];
 } NvmeBar;
 
 enum NvmeCapShift {
@@ -879,6 +880,7 @@ enum NvmeIdNsDps {
 
 static inline void _nvme_check_size(void)
 {
+    QEMU_BUILD_BUG_ON(sizeof(NvmeBar) != 4096);
     QEMU_BUILD_BUG_ON(sizeof(NvmeAerResult) != 4);
     QEMU_BUILD_BUG_ON(sizeof(NvmeCqe) != 16);
     QEMU_BUILD_BUG_ON(sizeof(NvmeDsmRange) != 16);
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 6628d0a4ba..2aa54bc20e 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -55,7 +55,6 @@
 #include "nvme.h"
 
 #define NVME_MAX_IOQPAIRS 0xffff
-#define NVME_REG_SIZE 0x1000
 #define NVME_DB_SIZE  4
 #define NVME_CMB_BIR 2
 #define NVME_PMR_BIR 2
@@ -1322,7 +1321,7 @@ static void nvme_mmio_write(void *opaque, hwaddr addr, uint64_t data,
     NvmeCtrl *n = (NvmeCtrl *)opaque;
     if (addr < sizeof(n->bar)) {
         nvme_write_bar(n, addr, data, size);
-    } else if (addr >= 0x1000) {
+    } else {
         nvme_process_db(n, addr, data);
     }
 }
@@ -1416,7 +1415,7 @@ static void nvme_init_state(NvmeCtrl *n)
 {
     n->num_namespaces = 1;
     /* add one to max_ioqpairs to account for the admin queue pair */
-    n->reg_size = pow2ceil(NVME_REG_SIZE +
+    n->reg_size = pow2ceil(sizeof(NvmeBar) +
                            2 * (n->params.max_ioqpairs + 1) * NVME_DB_SIZE);
     n->namespaces = g_new0(NvmeNamespace, n->num_namespaces);
     n->sq = g_new0(NvmeSQueue *, n->params.max_ioqpairs + 1);
-- 
2.21.3