[Xen-devel] Xen-unstable: pci-passthrough regression bisected to: x86/smp: use APIC ALLBUT destination shorthand when possible

[Sander Eikelenboom <linux@xxxxxxxxxxxxxx>]

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

I verified by reverting that commit and now it works fine again.

Box is AMD, guest is a HVM.

--
Sander

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