Introduce VIRTIO_F_SHM_PAGE_SIZE, a feature bit which indicates that the transport provides the page size for SHM regions. Signed-off-by: Sergio Lopez <slp@xxxxxxxxxx> --- drivers/virtio/virtio_pci_modern.c | 3 +++ drivers/virtio/virtio_ring.c | 2 ++ include/uapi/linux/virtio_config.h | 7 ++++++- 3 files changed, 11 insertions(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index 4e6c28aacd1b5dfc117337a689a25d668805e334..79616ce5057bf3b2b88cae7e8fb7729efa9dd632 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -367,6 +367,9 @@ static void vp_transport_features(struct virtio_device *vdev, u64 features) if (features & BIT_ULL(VIRTIO_F_ADMIN_VQ)) __virtio_set_bit(vdev, VIRTIO_F_ADMIN_VQ); + + if (features & BIT_ULL(VIRTIO_F_SHM_PAGE_SIZE)) + __virtio_set_bit(vdev, VIRTIO_F_SHM_PAGE_SIZE); } static int __vp_check_common_size_one_feature(struct virtio_device *vdev, u32 fbit, diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index fdd2d2b07b5a2aca864bc917306536685afb66a6..d853d5cf7e553be8bbe0ff461dc7312b258c6e58 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -2983,6 +2983,8 @@ void vring_transport_features(struct virtio_device *vdev) break; case VIRTIO_F_NOTIFICATION_DATA: break; + case VIRTIO_F_SHM_PAGE_SIZE: + break; default: /* We don't understand this bit. */ __virtio_clear_bit(vdev, i); diff --git a/include/uapi/linux/virtio_config.h b/include/uapi/linux/virtio_config.h index 2445f365bce74b4e926c6929322b269252ab6830..3171e3792263c2cd472ac09da18e593ab400751d 100644 --- a/include/uapi/linux/virtio_config.h +++ b/include/uapi/linux/virtio_config.h @@ -52,7 +52,7 @@ * rest are per-device feature bits. */ #define VIRTIO_TRANSPORT_F_START 28 -#define VIRTIO_TRANSPORT_F_END 42 +#define VIRTIO_TRANSPORT_F_END 43 #ifndef VIRTIO_CONFIG_NO_LEGACY /* Do we get callbacks when the ring is completely used, even if we've @@ -120,4 +120,9 @@ */ #define VIRTIO_F_ADMIN_VQ 41 +/* + * This feature indicates that the transport provides the SHM page size. + */ +#define VIRTIO_F_SHM_PAGE_SIZE 42 + #endif /* _UAPI_LINUX_VIRTIO_CONFIG_H */ -- 2.48.1
