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From: Sergio Lopez <slp@redhat.com>
Date: Wed, 02 Apr 2025 19:46:00 +0200
Subject: [PATCH v2 1/2] drm/virtio: introduce the HOST_PAGE_SIZE feature
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To: David Airlie <airlied@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>,
Gurchetan Singh <gurchetansingh@chromium.org>,
Chia-I Wu <olvaffe@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>, Thomas Zimmermann <tzimmermann@suse.de>,
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=?utf-8?q?Eugenio_P=C3=A9rez?= <eperezma@redhat.com>,
Gurchetan Singh <gurchetansingh@chromium.org>,
Rob Clark <robdclark@gmail.com>,
Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: dri-devel@lists.freedesktop.org, virtualization@lists.linux.dev,
linux-kernel@vger.kernel.org, Sergio Lopez <slp@redhat.com>
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Introduce a new feature, HOST_PAGE_SIZE, that indicates the host
provides its page size as a value in virtio_gpu_config.
Signed-off-by: Sergio Lopez <slp@redhat.com>
---
drivers/gpu/drm/virtio/virtgpu_drv.c | 1 +
drivers/gpu/drm/virtio/virtgpu_drv.h | 2 ++
drivers/gpu/drm/virtio/virtgpu_kms.c | 13 ++++++++++---
include/uapi/linux/virtio_gpu.h | 5 +++++
4 files changed, 18 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.c b/drivers/gpu/drm/virtio/=
virtgpu_drv.c
index 2d88e390feb468bf8783f13d90d0c4759dff0dcf..2e81aeaffdc6924dd88fb0778ed=
ef22084526866 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.c
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.c
@@ -154,6 +154,7 @@ static unsigned int features[] =3D {
VIRTIO_GPU_F_RESOURCE_UUID,
VIRTIO_GPU_F_RESOURCE_BLOB,
VIRTIO_GPU_F_CONTEXT_INIT,
+ VIRTIO_GPU_F_HOST_PAGE_SIZE,
};
static struct virtio_driver virtio_gpu_driver =3D {
.feature_table =3D features,
diff --git a/drivers/gpu/drm/virtio/virtgpu_drv.h b/drivers/gpu/drm/virtio/=
virtgpu_drv.h
index f17660a71a3e7a22b5d4fefa6b754c227a294037..439223b5f7cf8c9a120a28b7b7d=
57516928112e7 100644
--- a/drivers/gpu/drm/virtio/virtgpu_drv.h
+++ b/drivers/gpu/drm/virtio/virtgpu_drv.h
@@ -257,6 +257,7 @@ struct virtio_gpu_device {
bool has_resource_blob;
bool has_host_visible;
bool has_context_init;
+ bool has_host_page_size;
struct virtio_shm_region host_visible_region;
struct drm_mm host_visible_mm;
=20
@@ -270,6 +271,7 @@ struct virtio_gpu_device {
uint32_t num_capsets;
uint64_t capset_id_mask;
struct list_head cap_cache;
+ uint32_t host_page_size;
=20
/* protects uuid state when exporting */
spinlock_t resource_export_lock;
diff --git a/drivers/gpu/drm/virtio/virtgpu_kms.c b/drivers/gpu/drm/virtio/=
virtgpu_kms.c
index 7dfb2006c561ca13b15d979ddb8bf2d753e35dad..4ab95712434615c2cc35f2ff80d=
33b40c4212cfb 100644
--- a/drivers/gpu/drm/virtio/virtgpu_kms.c
+++ b/drivers/gpu/drm/virtio/virtgpu_kms.c
@@ -123,7 +123,7 @@ int virtio_gpu_init(struct virtio_device *vdev, struct =
drm_device *dev)
struct virtio_gpu_device *vgdev;
/* this will expand later */
struct virtqueue *vqs[2];
- u32 num_scanouts, num_capsets;
+ u32 num_scanouts, num_capsets, host_page_size;
int ret =3D 0;
=20
if (!virtio_has_feature(vdev, VIRTIO_F_VERSION_1))
@@ -196,6 +196,12 @@ int virtio_gpu_init(struct virtio_device *vdev, struct=
drm_device *dev)
if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_CONTEXT_INIT)) {
vgdev->has_context_init =3D true;
}
+ if (virtio_has_feature(vgdev->vdev, VIRTIO_GPU_F_HOST_PAGE_SIZE)) {
+ vgdev->has_host_page_size =3D true;
+ virtio_cread_le(vgdev->vdev, struct virtio_gpu_config,
+ host_page_size, &host_page_size);
+ vgdev->host_page_size =3D host_page_size;
+ }
=20
DRM_INFO("features: %cvirgl %cedid %cresource_blob %chost_visible",
vgdev->has_virgl_3d ? '+' : '-',
@@ -203,8 +209,9 @@ int virtio_gpu_init(struct virtio_device *vdev, struct =
drm_device *dev)
vgdev->has_resource_blob ? '+' : '-',
vgdev->has_host_visible ? '+' : '-');
=20
- DRM_INFO("features: %ccontext_init\n",
- vgdev->has_context_init ? '+' : '-');
+ DRM_INFO("features: %ccontext_init %chost_page_size\n",
+ vgdev->has_context_init ? '+' : '-',
+ vgdev->has_host_page_size ? '+' : '-');
=20
ret =3D virtio_find_vqs(vgdev->vdev, 2, vqs, vqs_info, NULL);
if (ret) {
diff --git a/include/uapi/linux/virtio_gpu.h b/include/uapi/linux/virtio_gp=
u.h
index bf2c9cabd20793e3851e749baadf210341445501..adc264df4e458e9c754936c3015=
c069e5ee6b899 100644
--- a/include/uapi/linux/virtio_gpu.h
+++ b/include/uapi/linux/virtio_gpu.h
@@ -64,6 +64,10 @@
* context_init and multiple timelines
*/
#define VIRTIO_GPU_F_CONTEXT_INIT 4
+/*
+ * Config struct contains host page size
+ */
+#define VIRTIO_GPU_F_HOST_PAGE_SIZE 5
=20
enum virtio_gpu_ctrl_type {
VIRTIO_GPU_UNDEFINED =3D 0,
@@ -364,6 +368,7 @@ struct virtio_gpu_config {
__le32 events_clear;
__le32 num_scanouts;
__le32 num_capsets;
+ __le32 host_page_size;
};
=20
/* simple formats for fbcon/X use */
--=20
2.48.1
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From: Sergio Lopez <slp@redhat.com>
Date: Wed, 02 Apr 2025 19:46:01 +0200
Subject: [PATCH v2 2/2] drm/virtio: add VIRTGPU_PARAM_HOST_PAGE_SIZE to
params
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To: David Airlie <airlied@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>,
Gurchetan Singh <gurchetansingh@chromium.org>,
Chia-I Wu <olvaffe@gmail.com>,
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Dmitry Osipenko <dmitry.osipenko@collabora.com>
Cc: dri-devel@lists.freedesktop.org, virtualization@lists.linux.dev,
linux-kernel@vger.kernel.org, Sergio Lopez <slp@redhat.com>
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Add VIRTGPU_PARAM_HOST_PAGE_SIZE as a param that can be read with
VIRTGPU_GETPARAM by userspace applications running in the guest to
obtain the host's page size and find out the right alignment to be used
in shared memory allocations.
Signed-off-by: Sergio Lopez <slp@redhat.com>
---
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 5 +++++
include/uapi/drm/virtgpu_drm.h | 1 +
2 files changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virti=
o/virtgpu_ioctl.c
index c33c057365f85a2ace536f91655c903036827312..405203b3c3847a8b318a7118aa3=
4356c839d249e 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -117,6 +117,11 @@ static int virtio_gpu_getparam_ioctl(struct drm_device=
*dev, void *data,
case VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME:
value =3D vgdev->has_context_init ? 1 : 0;
break;
+ case VIRTGPU_PARAM_HOST_PAGE_SIZE:
+ if (!vgdev->has_host_page_size)
+ return -EINVAL;
+ value =3D vgdev->host_page_size;
+ break;
default:
return -EINVAL;
}
diff --git a/include/uapi/drm/virtgpu_drm.h b/include/uapi/drm/virtgpu_drm.h
index c2ce71987e9bb816d13a300679336cb756f1cbcf..505f87263a15f55302d7134335b=
ebd91ff4cdae3 100644
--- a/include/uapi/drm/virtgpu_drm.h
+++ b/include/uapi/drm/virtgpu_drm.h
@@ -98,6 +98,7 @@ struct drm_virtgpu_execbuffer {
#define VIRTGPU_PARAM_CONTEXT_INIT 6 /* DRM_VIRTGPU_CONTEXT_INIT */
#define VIRTGPU_PARAM_SUPPORTED_CAPSET_IDs 7 /* Bitmask of supported capab=
ility set ids */
#define VIRTGPU_PARAM_EXPLICIT_DEBUG_NAME 8 /* Ability to set debug name f=
rom userspace */
+#define VIRTGPU_PARAM_HOST_PAGE_SIZE 9 /* Host's page size */
=20
struct drm_virtgpu_getparam {
__u64 param;
--=20
2.48.1