| Message ID | 20250213-virtio-shm-page-size-v1-1-5ee1f9984350@redhat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | virtio: obtain SHM page size from device | expand |
diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c index 5d78c2d572abfcfe2b84cdd82df622320fe97d5d..cd0a0407659517e6a318b117ba67258c59f1f983 100644 --- a/drivers/virtio/virtio_mmio.c +++ b/drivers/virtio/virtio_mmio.c @@ -560,6 +560,8 @@ static bool vm_get_shm_region(struct virtio_device *vdev, region->addr = addr; + region->page_size = 4096 >> 12; + return true; } diff --git a/drivers/virtio/virtio_pci_modern.c b/drivers/virtio/virtio_pci_modern.c index 5eaade7578606e4b02af0d66447417ad6aa11064..4e6c28aacd1b5dfc117337a689a25d668805e334 100644 --- a/drivers/virtio/virtio_pci_modern.c +++ b/drivers/virtio/virtio_pci_modern.c @@ -862,6 +862,7 @@ static bool vp_get_shm_region(struct virtio_device *vdev, region->len = len; region->addr = (u64) phys_addr + offset; + region->page_size = 4096 >> 12; return true; } diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index 169c7d367facb36dcabf9596068580ea8b8516c7..21ada8fcdf655894bb725045f54c9db3a1492b13 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -14,6 +14,7 @@ struct irq_affinity; struct virtio_shm_region { u64 addr; u64 len; + u16 page_size; /* PAGE_SIZE >> 12 */ }; typedef void vq_callback_t(struct virtqueue *);
Add a page_size field to virtio_shm_region to store page size supported by the device. This is required to support running VMs with a page size smaller than the host, among other potential scenarios. Signed-off-by: Sergio Lopez <slp@redhat.com> --- drivers/virtio/virtio_mmio.c | 2 ++ drivers/virtio/virtio_pci_modern.c | 1 + include/linux/virtio_config.h | 1 + 3 files changed, 4 insertions(+)