[PATCH v2 4/4] qga/commands-posix: Support fsinfo for non-PCI virtio devices, too

[Thomas Huth <thuth@redhat.com>]

QEMU on s390x uses virtio via channel I/O instead of PCI by default.
Add a function to detect and provide information for virtio-scsi and
virtio-block devices here, too.

Signed-off-by: Thomas Huth <thuth@redhat.com>
---
 qga/commands-posix.c | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index e8467ac567..744c2b5a5d 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -996,6 +996,39 @@ cleanup:
     return ret;
 }
 
+/*
+ * Store disk device info for non-PCI virtio devices (for example s390x
+ * channel I/O devices). Returns true if information has been stored, or
+ * false for failure.
+ */
+static bool build_guest_fsinfo_for_nonpci_virtio(char const *syspath,
+                                                 GuestDiskAddress *disk,
+                                                 Error **errp)
+{
+    unsigned int tgt[3];
+    char *p;
+
+    if (!strstr(syspath, "/virtio") || !strstr(syspath, "/block")) {
+        g_debug("Unsupported virtio device '%s'", syspath);
+        return false;
+    }
+
+    p = strstr(syspath, "/target");
+    if (p && sscanf(p + 7, "%*u:%*u:%*u/%*u:%u:%u:%u",
+                    &tgt[0], &tgt[1], &tgt[2]) == 3) {
+        /* virtio-scsi: target*:0:<target>:<unit> */
+        disk->bus_type = GUEST_DISK_BUS_TYPE_SCSI;
+        disk->bus = tgt[0];
+        disk->target = tgt[1];
+        disk->unit = tgt[2];
+    } else {
+        /* virtio-blk: 1 disk per 1 device */
+        disk->bus_type = GUEST_DISK_BUS_TYPE_VIRTIO;
+    }
+
+    return true;
+}
+
 /* Store disk device info specified by @sysfs into @fs */
 static void build_guest_fsinfo_for_real_device(char const *syspath,
                                                GuestFilesystemInfo *fs,
@@ -1046,7 +1079,14 @@ static void build_guest_fsinfo_for_real_device(char const *syspath,
     udev_device_unref(udevice);
 #endif
 
-    has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp);
+    if (strstr(syspath, "/devices/pci")) {
+        has_hwinf = build_guest_fsinfo_for_pci_dev(syspath, disk, errp);
+    } else if (strstr(syspath, "/virtio")) {
+        has_hwinf = build_guest_fsinfo_for_nonpci_virtio(syspath, disk, errp);
+    } else {
+        g_debug("Unsupported device type for '%s'", syspath);
+        has_hwinf = false;
+    }
 
     if (has_hwinf || disk->has_dev || disk->has_serial) {
         list->next = fs->disk;
-- 
2.18.1