On 13 September 2017 at 10:46, Eric Auger <eric.au...@redhat.com> wrote: > This series implements INTx to gsi routing for ARM VIRT/Gpex. This is > a respin of [1] which was lost in limbo. > > ARM virt uses GPEX PCIe bridge. This latter does not implement INTx > to GSI routing. PCIe/INTx assignment works but the consequence is > irqfd is not used along with INTx interrupts and VFIO INTx handlers > are executed on userspace leading to an important performance degradation. > > This issue is witnessed by the following messages; > > qemu-system-aarch64: -device vfio-pci,host=0006:90:00.0: PCI: Bug - > unimplemented PCI INTx routing (gpex-pcihost) > qemu-system-aarch64: PCI: Bug - unimplemented PCI INTx routing (gpex-pcihost) > qemu-system-aarch64: PCI: Bug - unimplemented PCI INTx routing (gpex-pcihost) > > So with this series, irqfd is set up for PCIe/INTx passthrough and we get > the optimal performance. Also we get rid of the above messages. > > This series can be found at: > https://github.com/eauger/qemu/tree/v2.10.0-gpex-v4 > > References: > [1] Generic PCIe host bridge INTx determination for INTx routing > https://lists.gnu.org/archive/html/qemu-devel/2015-09/msg04975.html
Applied to target-arm.next, thanks. -- PMM
