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>
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@ -479,6 +479,9 @@ static uint16_t nvme_get_feature(NvmeCtrl *n, NvmeCmd *cmd, NvmeRequest *req)
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req->cqe.result =
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req->cqe.result =
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cpu_to_le32((n->num_queues - 1) | ((n->num_queues - 1) << 16));
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cpu_to_le32((n->num_queues - 1) | ((n->num_queues - 1) << 16));
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break;
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break;
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case NVME_VOLATILE_WRITE_CACHE:
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req->cqe.result = cpu_to_le32(1);
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break;
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default:
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default:
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return NVME_INVALID_FIELD | NVME_DNR;
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return NVME_INVALID_FIELD | NVME_DNR;
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}
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}
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