From: Christoph Hellwig Date: Thu, 30 Apr 2015 09:44:17 +0000 (+0200) Subject: nvme: support NVME_VOLATILE_WRITE_CACHE feature X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=aacd5650c68ef2e9e19079ba60cb0df51e15880c;p=qemu.git 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 --- 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; }