Hi Michael, On 11/7/22 21:42, Michael S. Tsirkin wrote: > On Mon, Nov 07, 2022 at 09:34:31PM +0100, Eric Auger wrote: >> When the vhost iotlb is used along with a guest virtual iommu >> and the guest gets rebooted, some MISS messages may have been >> recorded just before the reboot and spuriously executed by >> the virtual iommu after the reboot. Despite the device iotlb gets >> re-initialized, the messages are not cleared. Fix that by calling >> vhost_clear_msg() at the end of vhost_init_device_iotlb(). >> >> Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx> >> --- >> drivers/vhost/vhost.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c >> index 40097826cff0..422a1fdee0ca 100644 >> --- a/drivers/vhost/vhost.c >> +++ b/drivers/vhost/vhost.c >> @@ -1751,6 +1751,7 @@ int vhost_init_device_iotlb(struct vhost_dev *d, bool enabled) >> } >> >> vhost_iotlb_free(oiotlb); >> + vhost_clear_msg(d); >> >> return 0; >> } > Hmm. Can't messages meanwhile get processes and affect the > new iotlb? Isn't the msg processing stopped at the moment this function is called (VHOST_SET_FEATURES)? Thanks Eric > > >> -- >> 2.37.3
