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From 250227a53c1d43d2bd8346922edb3452f3534be6 Mon Sep 17 00:00:00 2001
From: Thomas Huth <thuth@redhat.com>
Date: Fri, 2 Oct 2020 10:17:42 -0400
Subject: [PATCH 03/14] qga/commands-posix: Support fsinfo for non-PCI virtio
 devices, too
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RH-Author: Thomas Huth <thuth@redhat.com>
Message-id: <20201002101742.249169-4-thuth@redhat.com>
Patchwork-id: 98528
O-Subject: [RHEL-8.4.0 qemu-kvm PATCH 3/3] qga/commands-posix: Support fsinfo for non-PCI virtio devices, too
Bugzilla: 1755075
RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: David Hildenbrand <david@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>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
(cherry picked from commit 23843c129d5e1ca360605e511a43a34faebb47c4)
Signed-off-by: Danilo C. L. de Paula <ddepaula@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 6db76aadd1..c86c87ed52 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -1000,6 +1000,39 @@ 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,
@@ -1050,7 +1083,14 @@ 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;
-- 
2.27.0