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[Qemu-devel] [PATCH] nvme: support NVME_VOLATILE_WRITE_CACHE feature
From: |
Christoph Hellwig |
Subject: |
[Qemu-devel] [PATCH] nvme: support NVME_VOLATILE_WRITE_CACHE feature |
Date: |
Thu, 30 Apr 2015 11:44:17 +0200 |
User-agent: |
Mutt/1.5.17 (2007-11-01) |
The SCSI emulation in the Linux NVMe driver really wants to know
if a device has a volatile write cache. Given that qemu has moved
away from a model where we report the backing store WCE bit to
one where the WCE bit is supposed to be part of the migratable
guest-visible state we always return 1 here.
Signed-off-by: Christoph Hellwig <address@hidden>
diff --git a/hw/block/nvme.c b/hw/block/nvme.c
index 1e07166..50d76f1 100644
--- a/hw/block/nvme.c
+++ b/hw/block/nvme.c
@@ -479,6 +479,9 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd,
NvmeRequest *req)
req->cqe.result =
cpu_to_le32((n->num_queues - 1) | ((n->num_queues - 1) << 16));
break;
+ case NVME_VOLATILE_WRITE_CACHE:
+ req->cqe.result = cpu_to_le32(1);
+ break;
default:
return NVME_INVALID_FIELD | NVME_DNR;
}
- [Qemu-devel] [PATCH] nvme: support NVME_VOLATILE_WRITE_CACHE feature,
Christoph Hellwig <=