nvme: fix CMB endianness confusion

The CMB is marked as DEVICE_LITTLE_ENDIAN, so the data must be
read/written as if it was little-endian output (in the case of
big endian, we get two swaps, one in the memory core and one
in nvme.c).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

1 files changed, 2 insertions, 5 deletions

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 84062d388f..01f3e853cf 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -1177,16 +1177,13 @@ static void nvme_cmb_write(void *opaque, hwaddr addr, uint64_t data,
     unsigned size)
 {
     NvmeCtrl *n = (NvmeCtrl *)opaque;
-    memcpy(&n->cmbuf[addr], &data, size);
+    stn_le_p(&n->cmbuf[addr], size, data);
 }
 
 static uint64_t nvme_cmb_read(void *opaque, hwaddr addr, unsigned size)
 {
-    uint64_t val;
     NvmeCtrl *n = (NvmeCtrl *)opaque;
-
-    memcpy(&val, &n->cmbuf[addr], size);
-    return val;
+    return ldn_le_p(&n->cmbuf[addr], size);
 }
 
 static const MemoryRegionOps nvme_cmb_ops = {