From aacd5650c68ef2e9e19079ba60cb0df51e15880c Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 30 Apr 2015 11:44:17 +0200 Subject: [PATCH] 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 Acked-by: Keith Busch Signed-off-by: Kevin Wolf --- hw/block/nvme.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/block/nvme.c b/hw/block/nvme.c index ad988d7c24..4b6d5e6078 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; }