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From: | Philippe Mathieu-Daudé |
Subject: | Re: [Qemu-devel] [PATCH] vhost-scsi: prevent using uninitialized vqs |
Date: | Tue, 23 Oct 2018 01:49:16 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 |
On 22/10/18 4:17, yuchenlin via Qemu-devel wrote:
Ping? On 2018-10-12 17:07, address@hidden wrote:From: yuchenlin <address@hidden> There are 3 virtqueues (ctrl, event and cmd) for virtio scsi device, but seabios will only set the physical address for the 3rd one (cmd). Then in vhost_virtqueue_start(), virtio_queue_get_desc_addr() will be 0 for ctrl and event vq. In this case, ctrl and event vq are not initialized. vhost_verify_ring_mappings may use uninitialized vhost_virtqueue such that vhost_verify_ring_part_mapping returns ENOMEM. When encountered this problem, we got the following logs: qemu-system-x86_64: Unable to map available ring for ring 0 qemu-system-x86_64: Verify ring failure on region 0 Signed-off-by: Forrest Liu <address@hidden> Signed-off-by: yuchenlin <address@hidden>
Reviewed-by: Philippe Mathieu-Daudé <address@hidden>
--- hw/scsi/vhost-scsi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c index becf550085..7f21b4f9d6 100644 --- a/hw/scsi/vhost-scsi.c +++ b/hw/scsi/vhost-scsi.c @@ -183,7 +183,7 @@ static void vhost_scsi_realize(DeviceState *dev, Error **errp) } vsc->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; - vsc->dev.vqs = g_new(struct vhost_virtqueue, vsc->dev.nvqs); + vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs); vsc->dev.vq_index = 0; vsc->dev.backend_features = 0;
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