[PATCH 1/6] hw/block/nvme: fix shutdown/reset logic

[Klaus Jensen]

From: Klaus Jensen <k.jensen@samsung.com>

A shutdown is only about flushing stuff. It is the host that should
delete any queues, so do not perform a reset here.

Also, on shutdown, make sure that the PMR is flushed if in use.

Fixes: 368f4e752cf9 ("hw/block/nvme: Process controller reset and shutdown 
differently")
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
---
 hw/block/nvme.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 0854ee307227..cba509e90537 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -3413,7 +3413,7 @@ static void nvme_process_sq(void *opaque)
     }
 }
 
-static void nvme_clear_ctrl(NvmeCtrl *n)
+static void nvme_ctrl_reset(NvmeCtrl *n)
 {
     NvmeNamespace *ns;
     int i;
@@ -3447,11 +3447,7 @@ static void nvme_clear_ctrl(NvmeCtrl *n)
     n->aer_queued = 0;
     n->outstanding_aers = 0;
     n->qs_created = false;
-}
 
-static void nvme_ctrl_reset(NvmeCtrl *n)
-{
-    nvme_clear_ctrl(n);
     n->bar.cc = 0;
 }
 
@@ -3460,7 +3456,9 @@ static void nvme_ctrl_shutdown(NvmeCtrl *n)
     NvmeNamespace *ns;
     int i;
 
-    nvme_clear_ctrl(n);
+    if (n->pmrdev) {
+        memory_region_msync(&n->pmrdev->mr, 0, n->pmrdev->size);
+    }
 
     for (i = 1; i <= n->num_namespaces; i++) {
         ns = nvme_ns(n, i);
@@ -4303,7 +4301,7 @@ static void nvme_exit(PCIDevice *pci_dev)
     NvmeNamespace *ns;
     int i;
 
-    nvme_ctrl_shutdown(n);
+    nvme_ctrl_reset(n);
 
     for (i = 1; i <= n->num_namespaces; i++) {
         ns = nvme_ns(n, i);
-- 
2.30.0