vhost: scsi: add weight support
This patch will check the weight and exit the loop if we exceeds the weight. This is useful for preventing scsi kthread from hogging cpu which is guest triggerable. This addresses CVE-2019-3900. Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Stefan Hajnoczi <stefanha@redhat.com> Fixes: 057cbf49 ("tcm_vhost: Initial merge for vhost level target fabric driver") Signed-off-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> CVE-2019-3900 (backported from commit c1ea02f1) [tyhicks: Backport to Xenial: - Minor context adjustment in local variables - Adjust context around the loop in vhost_scsi_handle_vq() - No need to modify vhost_scsi_ctl_handle_vq() since it was added later in commit 0d02dbd6 ("vhost/scsi: Respond to control queue operations")] Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Acked-by: Stefan Bader <stefan.bader@canonical.com> Acked-by: Connor Kuehl <connor.kuehl@canonical.com> Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>
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