VT-d Posted-Interrupts is an enhancement to CPU side Posted-Interrupt. With VT-d Posted-Interrupts enabled, external interrupts from direct-assigned devices can be delivered to guests without VMM intervention when guest is running in non-root mode. You can find the VT-d Posted-Interrtups Spec. in the following URL: http://www.intel.com/content/www/us/en/intelligent-systems/intel-technology/vt-directed-io-spec.html This patch set does the following things: - Define a new VFIO group KVM_DEV_VFIO_INTERRUPT and it's attributes KVM_DEV_VFIO_INTERRUPT_POSTING_IRQ. Qemu can use this interface to configure VT-d PI when guest updates the interrupt configuration (MSI/MSI-X configuration). - Define a new VFIO API: vfio_msi_get_irq(), which can be used by KVM to get the host irq of the assigned devices. Then KVM can update the associated IRTE for VT-d PI. Feng Wu (2): vfio: Add new interrupt group for VFIO vfio: Add VFIO API vfio_msi_get_irq Documentation/virtual/kvm/devices/vfio.txt | 8 ++++++++ drivers/vfio/pci/vfio_pci.c | 10 ++++++++++ include/linux/vfio.h | 2 ++ include/uapi/linux/kvm.h | 14 ++++++++++++++ 4 files changed, 34 insertions(+), 0 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
