[PATCH 0/6] MSI-INTx interrupt translation for HVM

[Qing He <qing.he@intel.com>]

This patchset enables MSI-INTx interrupt translation for HVM
domains. The intention of the patch is to use MSI as the physical
interrupt mechanism for passthrough device as much as possible,
thus reducing the pirq sharing among domains.

When MSI is globally enabled, if the device has the MSI capability
but doesn't used by the guest, hypervisor will try to user MSI as
the underlying pirq and inject translated INTx irq to guest
vioapic. When guest itself enabled MSI or MSI-X, the translation
is automatically turned off.

Add a config file option to disable/enable this feature. Also, in
order to allow the user to override the option per device, a
per-device option mechanism is implemented and an MSI-INTx option
is added

The patch set contains 6 patches and is organized as below:
    [PATCH 1/6] hypervisor patch
   *[PATCH 2/6] qemu patch
    [PATCH 3/6] add pci options in domain config file
    [PATCH 4/6] XenAPI version of the above patch
    [PATCH 5/6] add global and per-device option for MSI-INTx
    [PATCH 6/6] documentation and example

 * against ioemu-remote