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nvme: support NVME_VOLATILE_WRITE_CACHE feature 

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 <hch@lst.de>
Acked-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Christoph Hellwig 2015-04-30 11:44:17 +02:00 committed by Kevin Wolf
parent ecbda7a225
commit aacd5650c6
1 changed files with 3 additions and 0 deletions
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3
hw/block/nvme.c
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@ -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;
}