2012/7/25 Ben Hutchings <ben@xxxxxxxxxxxxxxx>: > On Wed, 2012-07-25 at 20:13 +0800, Wang Sen wrote: >> When using the commands below to write some data to a virtio-scsi LUN of the >> QEMU guest(32-bit) with 1G physical memory(qemu -m 1024), the qemu will crash. >> >> # sudo mkfs.ext4 /dev/sdb (/dev/sdb is the virtio-scsi LUN.) >> # sudo mount /dev/sdb /mnt >> # dd if=/dev/zero of=/mnt/file bs=1M count=1024 >> >> In current implementation, sg_set_buf is called to add buffers to sg list which >> is put into the virtqueue eventually. But if there are some HighMem pages in >> table->sgl you can not get virtual address by sg_virt. So, sg_virt(sg_elem) may >> return NULL value. This will cause QEMU exit when virtqueue_map_sg is called >> in QEMU because an invalid GPA is passed by virtqueue. >> >> I take Paolo's solution mentioned in last thread to avoid failure on handling >> flag bits. >> >> I have tested the patch on my workstation. QEMU would not crash any more. >> >> Signed-off-by: Wang Sen <senwang@xxxxxxxxxxxxxxxxxx> > [...] > > This is not the correct way to submit a change for stable. See > Documentation/stable_kernel_rules.txt. OK, thanks. > > Ben. > > -- > Ben Hutchings > If more than one person is responsible for a bug, no one is at fault. -- ------------------------------------------ Wang Sen Addr: XUPT,Xi'an,Shaanxi,China Email: kelvin.xupt@xxxxxxxxx ------------------------------------------ -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
