On Mon, Feb 03, 2020 at 01:30:55PM +0100, Sander Eikelenboom wrote: > On 03/02/2020 13:23, Roger Pau Monné wrote: > > On Mon, Feb 03, 2020 at 09:33:51AM +0100, Sander Eikelenboom wrote: > >> Hi Roger, > >> > >> Last week I encountered an issue with the PCI-passthrough of a USB > >> controller. > >> In the guest I get: > >> [ 1143.313756] xhci_hcd 0000:00:05.0: xHCI host not responding to stop > >> endpoint command. > >> [ 1143.334825] xhci_hcd 0000:00:05.0: xHCI host controller not > >> responding, assume dead > >> [ 1143.347364] xhci_hcd 0000:00:05.0: HC died; cleaning up > >> [ 1143.356407] usb 1-2: USB disconnect, device number 2 > >> > >> Bisection turned up as the culprit: > >> commit 5500d265a2a8fa63d60c08beb549de8ec82ff7a5 > >> x86/smp: use APIC ALLBUT destination shorthand when possible > > > > Sorry to hear that, let see if we can figure out what's wrong. > > No problem, that is why I test stuff :) > > >> I verified by reverting that commit and now it works fine again. > > > > Does the same controller work fine when used in dom0? > > Will test that, but as all other pci devices in dom0 work fine, > I assume this controller would also work fine in dom0 (as it has also > worked fine for ages with PCI-passthrough to that guest and still works > fine when reverting the referenced commit).
Is this the only device that fails to work when doing pci-passthrough, or other devices also don't work with the mentioned change applied? Have you tested on other boxes? > I don't know if your change can somehow have a side effect > on latency around the processing of pci-passthrough ? Hm, the mentioned commit should speed up broadcast IPIs, but I don't see how it could slow down other interrupts. Also I would think the domain is not receiving interrupts from the device, rather than interrupts being slow. Can you also paste the output of lspci -v for that xHCI device from dom0? Thanks, Roger. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
