lightnvm: refactor and change vendor id for qemu

The QEMU NVMe implementation uses Intel vendor, Intel device id, and the
first vendor specific byte to identify a LightNVM compatible nvme
instance.

Instead of using the Intel specific, use a preallocated from CNEX Labs
instead. This lets us uniquely identify a QEMU lightnvm device without
breaking other vendor specific work in the qemu device driver.

Reported-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

drivers/nvme/host/lightnvm.c

@@ -569,18 +569,25 @@ void nvme_nvm_unregister(struct request_queue *q, char *disk_name)
 	nvm_unregister(disk_name);
 }
 
+/* move to shared place when used in multiple places. */
+#define PCI_VENDOR_ID_CNEX 0x1d1d
+#define PCI_DEVICE_ID_CNEX_WL 0x2807
+#define PCI_DEVICE_ID_CNEX_QEMU 0x1f1f
+
 int nvme_nvm_ns_supported(struct nvme_ns *ns, struct nvme_id_ns *id)
 {
 	struct nvme_dev *dev = ns->dev;
 	struct pci_dev *pdev = to_pci_dev(dev->dev);
 
 	/* QEMU NVMe simulator - PCI ID + Vendor specific bit */
-	if (pdev->vendor == PCI_VENDOR_ID_INTEL && pdev->device == 0x5845 &&
+	if (pdev->vendor == PCI_VENDOR_ID_CNEX &&
+				pdev->device == PCI_DEVICE_ID_CNEX_QEMU &&
 							id->vs[0] == 0x1)
 		return 1;
 
 	/* CNEX Labs - PCI ID + Vendor specific bit */
-	if (pdev->vendor == 0x1d1d && pdev->device == 0x2807 &&
+	if (pdev->vendor == PCI_VENDOR_ID_CNEX &&
+				pdev->device == PCI_DEVICE_ID_CNEX_WL &&
 							id->vs[0] == 0x1)
 		return 1;