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[PULL 2/4] virtio-pci: fix virtio_pci_queue_enabled()
From: |
Jason Wang |
Subject: |
[PULL 2/4] virtio-pci: fix virtio_pci_queue_enabled() |
Date: |
Tue, 28 Jul 2020 13:57:56 +0800 |
From: Laurent Vivier <lvivier@redhat.com>
In legacy mode, virtio_pci_queue_enabled() falls back to
virtio_queue_enabled() to know if the queue is enabled.
But virtio_queue_enabled() calls again virtio_pci_queue_enabled()
if k->queue_enabled is set. This ends in a crash after a stack
overflow.
The problem can be reproduced with
"-device virtio-net-pci,disable-legacy=off,disable-modern=true
-net tap,vhost=on"
And a look to the backtrace is very explicit:
...
#4 0x000000010029a438 in virtio_queue_enabled ()
#5 0x0000000100497a9c in virtio_pci_queue_enabled ()
...
#130902 0x000000010029a460 in virtio_queue_enabled ()
#130903 0x0000000100497a9c in virtio_pci_queue_enabled ()
#130904 0x000000010029a460 in virtio_queue_enabled ()
#130905 0x0000000100454a20 in vhost_net_start ()
...
This patch fixes the problem by introducing a new function
for the legacy case and calls it from virtio_pci_queue_enabled().
It also calls it from virtio_queue_enabled() to avoid code duplication.
Fixes: f19bcdfedd53 ("virtio-pci: implement queue_enabled method")
Cc: Jason Wang <jasowang@redhat.com>
Cc: Cindy Lu <lulu@redhat.com>
CC: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
---
hw/virtio/virtio-pci.c | 2 +-
hw/virtio/virtio.c | 7 ++++++-
include/hw/virtio/virtio.h | 1 +
3 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index 2b1f9cc..ccdf54e 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -1116,7 +1116,7 @@ static bool virtio_pci_queue_enabled(DeviceState *d, int
n)
return proxy->vqs[n].enabled;
}
- return virtio_queue_enabled(vdev, n);
+ return virtio_queue_enabled_legacy(vdev, n);
}
static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 546a198..e983025 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -3309,6 +3309,11 @@ hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev,
int n)
return vdev->vq[n].vring.desc;
}
+bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n)
+{
+ return virtio_queue_get_desc_addr(vdev, n) != 0;
+}
+
bool virtio_queue_enabled(VirtIODevice *vdev, int n)
{
BusState *qbus = qdev_get_parent_bus(DEVICE(vdev));
@@ -3317,7 +3322,7 @@ bool virtio_queue_enabled(VirtIODevice *vdev, int n)
if (k->queue_enabled) {
return k->queue_enabled(qbus->parent, n);
}
- return virtio_queue_get_desc_addr(vdev, n) != 0;
+ return virtio_queue_enabled_legacy(vdev, n);
}
hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n)
diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h
index 198ffc7..e424df1 100644
--- a/include/hw/virtio/virtio.h
+++ b/include/hw/virtio/virtio.h
@@ -295,6 +295,7 @@ typedef struct VirtIORNGConf VirtIORNGConf;
VIRTIO_F_RING_PACKED, false)
hwaddr virtio_queue_get_desc_addr(VirtIODevice *vdev, int n);
+bool virtio_queue_enabled_legacy(VirtIODevice *vdev, int n);
bool virtio_queue_enabled(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_avail_addr(VirtIODevice *vdev, int n);
hwaddr virtio_queue_get_used_addr(VirtIODevice *vdev, int n);
--
2.7.4