diff options
| author | Jason Wang <jasowang@redhat.com> | 2015-11-06 16:02:48 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2015-11-12 15:49:32 +0200 |
| commit | 9824d2a39d9893ef9bbe71f94efb57da265b73f6 (patch) | |
| tree | 893f42b96a6e2c3c5d5e823047599453c9134a1e /hw/virtio/virtio-pci.h | |
| parent | bc85ccfdf5cc045588f665c84b5707d7364c8a6c (diff) | |
virtio-pci: introduce pio notification capability for modern device
We used to use mmio for notification. This could be slow on some arch
(e.g on x86 without EPT). So this patch introduces pio bar and a pio
notification cap for modern device. This ability is enabled through
property "modern-pio-notify" for virtio pci devices and was disabled
by default. Management can enable when it thinks it was needed.
Benchmarks shows almost no obvious difference compared to legacy
device on machines without ept. Thanks Wenli Quan <wquan@redhat.com>
for the benchmarking.
Cc: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'hw/virtio/virtio-pci.h')
| -rw-r--r-- | hw/virtio/virtio-pci.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h index 58679f78bf..460c3c9ce0 100644 --- a/hw/virtio/virtio-pci.h +++ b/hw/virtio/virtio-pci.h @@ -79,6 +79,11 @@ typedef struct VirtioBusClass VirtioPCIBusClass; #define VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT 4 #define VIRTIO_PCI_FLAG_MIGRATE_EXTRA (1 << VIRTIO_PCI_FLAG_MIGRATE_EXTRA_BIT) +/* have pio notification for modern device ? */ +#define VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT 5 +#define VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY \ + (1 << VIRTIO_PCI_FLAG_MODERN_PIO_NOTIFY_BIT) + typedef struct { MSIMessage msg; int virq; @@ -123,11 +128,14 @@ struct VirtIOPCIProxy { VirtIOPCIRegion isr; VirtIOPCIRegion device; VirtIOPCIRegion notify; + VirtIOPCIRegion notify_pio; MemoryRegion modern_bar; + MemoryRegion io_bar; MemoryRegion modern_cfg; AddressSpace modern_as; uint32_t legacy_io_bar; uint32_t msix_bar; + uint32_t modern_io_bar; uint32_t modern_mem_bar; int config_cap; uint32_t flags; |