commit 0ea1e4a6d9b62cf29e210d2b4ba9fd43917522e3 upstream. According to the spec, if the VIRTIO_RING_F_EVENT_IDX feature bit is negotiated the driver MUST set flags to 0. Not dirtying the available ring in virtqueue_disable_cb also has a minor positive performance impact, improving L1 dcache load missed by ~0.5% in vring_bench. Writes to the used event field (vring_used_event) are still unconditional. Cc: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Ladi Prosek <lprosek@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
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config.c | ||
Kconfig | ||
Makefile | ||
virtio.c | ||
virtio_balloon.c | ||
virtio_input.c | ||
virtio_mmio.c | ||
virtio_pci_common.c | ||
virtio_pci_common.h | ||
virtio_pci_legacy.c | ||
virtio_pci_modern.c | ||
virtio_ring.c |