During Xen boot I am seeing the panic in the subject line from .../xen/drivers/passthrough/vgt/qinval.c
From the Fault Status Register (= 0x40 (ITE)). I am seeing a hardware timeout on the invalidate Disabling queued invalidation is not an option. I need to find out why the operation is timing out and fix it. I found two timeouts; one in software and one in hardware. After the invalidate is submitted there is a wait packet submitted and the boot software waits for the wait packet to complete in a loop with a software timeout. At the end of the software timeout it issues the panic. I can increase the software timeout but it still doesn't solve the problem. Just before the panic I dump the value of the Fault Status Register and I see that the hardware has already timed out (FSTS_REG = 0x40 = ITE = "Invalidation Timeout Error"). As a first step in solving this I would like to increase the hardware timeout value. I have the Intel spec and I was reading from the spec... " Hardware starts an invalidation completion timer for this ITag, and issues the invalidation request message to the specified endpoint. If the invalidation command from software is for a first-level mapping, the invalidation request message is generated with the appropriate PASID prefix to identify the target PASID. The invalidation completion time-out value is recommended to be sufficiently larger than the PCI-Express read completion time-outs. " The above leads me to believe that there should be some way of setting the invalidation completion time-out value. Unfortunately I couldn't find anything in the Intel spec that tells me how to set the "invalidation completion time-out". Can someone point me in the right direction to setting the completion timer? Thanks, Kelly _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
