[Xen-users] xhci_hcd intterrupt affinity in Dom0/DomU limited to single interrupt

[Justin Acker <ackerj67@xxxxxxxxx>]

Hello,

Is there a configuration option or patch to control the xhci_hcd interrupt smp affinity? It looks like the Dom0 and DomU, if passed through, will only use a single interrupt on the xhci_hcd controller (usually the first unless smp affinity is manually set). The xhci_hcd interrupts appear to be scheduled across all CPUs when booting with a native kernel. I've noticed other devices seem to schedule interrupts across all CPUs when in the Dom0 and DomU. Using Xen 4.5 and Kernel 3.19.

 76:      11304          0     149579          0          0          0          0          0  xen-pirq-msi       0000:00:1f.2
 77:       1243          0          0      35447          0          0          0          0  xen-pirq-msi       radeon
 78:      82521          0          0          0          0          0          0          0  xen-pirq-msi       xhci_hcd
 79:         23          0          0          0          0          0          0          0  xen-pirq-msi       mei_me
 80:         11          0          0          0          0        741          0          0  xen-pirq-msi       em1
 81:        350          0          0          0       1671          0          0          0  xen-pirq-msi       iwlwifi
 82:        275          0          0          0          0          0          0          0  xen-pirq-msi       snd_hda_intel



The USB controller is an Intel C210:

00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family USB xHCI Host Controller (rev 04) (prog-if 30 [XHCI])
    Subsystem: Dell Device 053e
    Flags: bus master, medium devsel, latency 0, IRQ 78
    Memory at f7f20000 (64-bit, non-prefetchable) [size=64K]
    Capabilities: [70] Power Management version 2
    Capabilities: [80] MSI: Enable+ Count=1/8 Maskable- 64bit+
    Kernel driver in use: xhci_hcd
    Kernel modules: xhci_pci

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