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Hi, This is the first attempt to add a new qemu nvme backend using in-kernel nvme target. Most code are ported from qemu-nvme and also borrow code from Hannes Reinecke's rts-megasas. It's similar as vhost-scsi, but doesn't use virtio. The advantage is guest can run unmodified NVMe driver. So guest can be any OS that has a NVMe driver. The goal is to get as good performance as

Hi, This is the first attempt to add a new qemu nvme backend using in-kernel nvme target. Most code are ported from qemu-nvme and also borrow code from Hannes Reinecke's rts-megasas. It's similar as vhost-scsi, but doesn't use virtio. The advantage is guest can run unmodified NVMe driver. So guest can be any OS that has a NVMe driver. The goal is to get as good performance as

On 18/11/2015 06:47, Ming Lin wrote: > @@ -726,7 +798,11 @@ static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val) > } > > start_sqs = nvme_cq_full(cq) ? 1 : 0; > - cq->head = new_head; > + /* When the mapped pointer memory area is setup, we don't rely on > + * the MMIO written values to update the head pointer. */ >

On 18/11/2015 06:47, Ming Lin wrote: > @@ -726,7 +798,11 @@ static void nvme_process_db(NvmeCtrl *n, hwaddr addr, int val) > } > > start_sqs = nvme_cq_full(cq) ? 1 : 0; > - cq->head = new_head; > + /* When the mapped pointer memory area is setup, we don't rely on > + * the MMIO written values to update the head pointer. */ >

...ifier(EventNotifier *e) > +{ > + NvmeSQueue *sq = > + container_of(e, NvmeSQueue, notifier); > + > + nvme_process_sq(sq); > +} > + > +static void nvme_init_sq_eventfd(NvmeSQueue *sq) > +{ > + NvmeCtrl *n = sq->ctrl; > + uint16_t offset = sq->sqid * 2 * NVME_CAP_DSTRD(n->bar.cap); > + > + event_notifier_init(&sq->notifier, 0); > + event_notifier_set_handler(&sq->notifier, nvme_sq_notifier); > + memory_region_add_eventfd(&n->iomem, > + 0x1000 + offset, 4, true, sq->sqid * 2, &sq-&g...

...ifier(EventNotifier *e) > +{ > + NvmeSQueue *sq = > + container_of(e, NvmeSQueue, notifier); > + > + nvme_process_sq(sq); > +} > + > +static void nvme_init_sq_eventfd(NvmeSQueue *sq) > +{ > + NvmeCtrl *n = sq->ctrl; > + uint16_t offset = sq->sqid * 2 * NVME_CAP_DSTRD(n->bar.cap); > + > + event_notifier_init(&sq->notifier, 0); > + event_notifier_set_handler(&sq->notifier, nvme_sq_notifier); > + memory_region_add_eventfd(&n->iomem, > + 0x1000 + offset, 4, true, sq->sqid * 2, &sq-&g...

...1, &cq->notifier); +} + +static void nvme_sq_notifier(EventNotifier *e) +{ + NvmeSQueue *sq = + container_of(e, NvmeSQueue, notifier); + + nvme_process_sq(sq); +} + +static void nvme_init_sq_eventfd(NvmeSQueue *sq) +{ + NvmeCtrl *n = sq->ctrl; + uint16_t offset = sq->sqid * 2 * NVME_CAP_DSTRD(n->bar.cap); + + event_notifier_init(&sq->notifier, 0); + event_notifier_set_handler(&sq->notifier, nvme_sq_notifier); + memory_region_add_eventfd(&n->iomem, + 0x1000 + offset, 4, true, sq->sqid * 2, &sq->notifier); +} + static...

...eSQueue *sq = > > + container_of(e, NvmeSQueue, notifier); > > + > > + nvme_process_sq(sq); > > +} > > + > > +static void nvme_init_sq_eventfd(NvmeSQueue *sq) > > +{ > > + NvmeCtrl *n = sq->ctrl; > > + uint16_t offset = sq->sqid * 2 * NVME_CAP_DSTRD(n->bar.cap); > > + > > + event_notifier_init(&sq->notifier, 0); > > + event_notifier_set_handler(&sq->notifier, nvme_sq_notifier); > > + memory_region_add_eventfd(&n->iomem, > > + 0x1000 + offset, 4, true, sq...

...hutdowns: 317 Media and Data Integrity Errors: 0 Error Information Log Entries: 177 Warning Comp. Temperature Time: 0 Critical Comp. Temperature Time: 0 Temperature Sensor 2: 77 Celsius Error Information (NVMe Log 0x01, max 64 entries) Num ErrCount SQId CmdId Status PELoc LBA NSID VS 0 177 0 0x0014 0x4004 - 8796109799680 1 - 1 176 0 0x0019 0x4004 - 8796109799680 1 - 2 175 0 0x001a 0x4004 - 8796109799680 1 - 3 174 0 0x0005 0x4004...