Add class property to configure KVM device node to use

This allows passing the KVM device node to use as a file
descriptor via /dev/fdset/XX. Passing the device node to
use as a file descriptor allows running qemu unprivileged
even when the user running qemu is not in the kvm group
on distributions where access to /dev/kvm is gated behind
membership of the kvm group (as long as the process invoking
qemu is able to open /dev/kvm and passes the file descriptor
to qemu).

Signed-off-by: Daan De Meyer <daan.j.demeyer@gmail.com>
Message-ID: <20231021134015.1119597-1-daan.j.demeyer@gmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 24 insertions, 1 deletions

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index bbc60146d1..49e755ec4a 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -2349,7 +2349,7 @@ static int kvm_init(MachineState *ms)
     QTAILQ_INIT(&s->kvm_sw_breakpoints);
 #endif
     QLIST_INIT(&s->kvm_parked_vcpus);
-    s->fd = qemu_open_old("/dev/kvm", O_RDWR);
+    s->fd = qemu_open_old(s->device ?: "/dev/kvm", O_RDWR);
     if (s->fd == -1) {
         fprintf(stderr, "Could not access KVM kernel module: %m\n");
         ret = -errno;
@@ -3585,6 +3585,24 @@ static void kvm_set_dirty_ring_size(Object *obj, Visitor *v,
     s->kvm_dirty_ring_size = value;
 }
 
+static char *kvm_get_device(Object *obj,
+                            Error **errp G_GNUC_UNUSED)
+{
+    KVMState *s = KVM_STATE(obj);
+
+    return g_strdup(s->device);
+}
+
+static void kvm_set_device(Object *obj,
+                           const char *value,
+                           Error **errp G_GNUC_UNUSED)
+{
+    KVMState *s = KVM_STATE(obj);
+
+    g_free(s->device);
+    s->device = g_strdup(value);
+}
+
 static void kvm_accel_instance_init(Object *obj)
 {
     KVMState *s = KVM_STATE(obj);
@@ -3603,6 +3621,7 @@ static void kvm_accel_instance_init(Object *obj)
     s->xen_version = 0;
     s->xen_gnttab_max_frames = 64;
     s->xen_evtchn_max_pirq = 256;
+    s->device = NULL;
 }
 
 /**
@@ -3643,6 +3662,10 @@ static void kvm_accel_class_init(ObjectClass *oc, void *data)
     object_class_property_set_description(oc, "dirty-ring-size",
         "Size of KVM dirty page ring buffer (default: 0, i.e. use bitmap)");
 
+    object_class_property_add_str(oc, "device", kvm_get_device, kvm_set_device);
+    object_class_property_set_description(oc, "device",
+        "Path to the device node to use (default: /dev/kvm)");
+
     kvm_arch_accel_class_init(oc);
 }