On 02/11/17 15:50, Gerd Hoffmann wrote: > Queues have 256 entries on kvmtool, support that. Needs more memory for > virtqueues now. But with the move to 32bit drivers for virtio this > should not be much of an issue any more. > > Known problems (probably kvmtool bugs): > * Must bump to 260 entries to make things actually work, > otherwise kvmtool segfaults. Oops. You mean setting MAX_QUEUE_NUM to 256 instead of 260 in seabios causes a kvmtool crash? Do you have any more detail on the segfault? One problem I can see is kvmtool's handling of used/avail event indexes. net and blk devices call virtio_queue__should_signal which reads event indexes without of checking if VIRTIO_F_EVENT_IDX was negotiated first. Since seabios doesn't use the event indexes, this would lead to missing signals, but not a segfault. > * Linux kernel doesn't find virtio-blk devices after seabios > initialized them. virtio device reset not working properly? No, reset isn't implemented at all... A lot of work is required to properly clear the state and threads of each device. Thanks, Jean
