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If the device that is to be shared with a guest is a level device and the IRQ is shared with the initial domain we need to take actions. Mainly we install a dummy IRQ handler that will ACK on the interrupt line so as to not have the initial domain disable the interrupt line. This dummy IRQ handler is not enabled when the device MSI/MSI-X lines are set, nor for edge interrupts. And also not for level interrupts that are not shared amongst devices. Lastly, if the user passes to the guest all of the PCI devices on the shared line the we won't install the dummy handler either. There is also SysFS instrumentation to check its state and turn IRQ ACKing on/off if necessary. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> |
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| .. | ||
| xen-pciback | ||
| xenbus | ||
| xenfs | ||
| balloon.c | ||
| biomerge.c | ||
| cpu_hotplug.c | ||
| events.c | ||
| evtchn.c | ||
| features.c | ||
| gntalloc.c | ||
| gntdev.c | ||
| grant-table.c | ||
| Kconfig | ||
| Makefile | ||
| manage.c | ||
| pci.c | ||
| platform-pci.c | ||
| swiotlb-xen.c | ||
| sys-hypervisor.c | ||
| tmem.c | ||
| xen-balloon.c | ||
| xencomm.c | ||