qga: Introduce NVMe disk bus type

Assigning a NVMe disk by VFIO or emulating a NVMe controller by QEMU,
a NVMe disk get exposed in guest side. Support NVMe disk bus type and
implement posix version.

Test PCI passthrough case:
~#virsh qemu-agent-command buster '{"execute":"guest-get-disks"}' | jq
  ...
    {
      "name": "/dev/nvme0n1",
      "dependencies": [],
      "partition": false,
      "address": {
        "serial": "SAMSUNG MZQL23T8HCLS-00A07_S64HNE0N500076",
        "bus-type": "nvme",
        "bus": 0,
        "unit": 0,
        "pci-controller": {
          "bus": 0,
          "slot": 22,
          "domain": 0,
          "function": 0
        },
        "dev": "/dev/nvme0n1",
        "target": 0
      }
  ...

Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Message-Id: <20220420022610.418052-2-pizhenwei@bytedance.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 7ab8d5e..a5fbae0 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -890,7 +890,8 @@ static bool build_guest_fsinfo_for_pci_dev(char const *syspath,
         if (driver && (g_str_equal(driver, "ata_piix") ||
                        g_str_equal(driver, "sym53c8xx") ||
                        g_str_equal(driver, "virtio-pci") ||
-                       g_str_equal(driver, "ahci"))) {
+                       g_str_equal(driver, "ahci") ||
+                       g_str_equal(driver, "nvme"))) {
             break;
         }
 
@@ -985,6 +986,8 @@ static bool build_guest_fsinfo_for_pci_dev(char const *syspath,
             g_debug("no host for '%s' (driver '%s')", syspath, driver);
             goto cleanup;
         }
+    } else if (strcmp(driver, "nvme") == 0) {
+        disk->bus_type = GUEST_DISK_BUS_TYPE_NVME;
     } else {
         g_debug("unknown driver '%s' (sysfs path '%s')", driver, syspath);
         goto cleanup;