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virtio: Manage device and driver capabilities via the admin commands

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Manage device and driver capabilities via the admin commands.

The device exposes its supported features and resource object limits via
an administrative command called VIRTIO_ADMIN_CMD_CAP_ID_LIST_QUERY,
using the 'self group type.'

Each capability is identified by a unique ID, and the driver
communicates the functionality and resource limits it plans to utilize.

The capability VIRTIO_DEV_PARTS_CAP specifically represents the device's
parts resource object limit.

Manage the device's parts resource object ID using a common IDA for both
get and set operations.

Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Yishai Hadas <yishaih@nvidia.com>
Link: https://lore.kernel.org/r/20241113115200.209269-4-yishaih@nvidia.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Yishai Hadas
2024-11-13 13:51:56 +02:00
committed by Alex Williamson
parent 704806ca40
commit bfcad51860
2 changed files with 116 additions and 2 deletions
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13
drivers/virtio/virtio_pci_common.h
View File

@@ -48,6 +48,9 @@ struct virtio_pci_admin_vq {
/* Protects virtqueue access. */
spinlock_t lock;
u64 supported_cmds;
u64 supported_caps;
u8 max_dev_parts_objects;
struct ida dev_parts_ida;
/* Name of the admin queue: avq.$vq_index. */
char name[10];
u16 vq_index;
@@ -167,15 +170,21 @@ struct virtio_device *virtio_pci_vf_get_pf_dev(struct pci_dev *pdev);
BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_DEV_CFG_READ) | \
BIT_ULL(VIRTIO_ADMIN_CMD_LEGACY_NOTIFY_INFO))
#define VIRTIO_DEV_PARTS_ADMIN_CMD_BITMAP \
(BIT_ULL(VIRTIO_ADMIN_CMD_CAP_ID_LIST_QUERY) | \
BIT_ULL(VIRTIO_ADMIN_CMD_DRIVER_CAP_SET) | \
BIT_ULL(VIRTIO_ADMIN_CMD_DEVICE_CAP_GET))
/* Unlike modern drivers which support hardware virtio devices, legacy drivers
* assume software-based devices: e.g. they don't use proper memory barriers
* on ARM, use big endian on PPC, etc. X86 drivers are mostly ok though, more
* or less by chance. For now, only support legacy IO on X86.
*/
#ifdef CONFIG_VIRTIO_PCI_ADMIN_LEGACY
#define VIRTIO_ADMIN_CMD_BITMAP VIRTIO_LEGACY_ADMIN_CMD_BITMAP
#define VIRTIO_ADMIN_CMD_BITMAP (VIRTIO_LEGACY_ADMIN_CMD_BITMAP | \
VIRTIO_DEV_PARTS_ADMIN_CMD_BITMAP)
#else
#define VIRTIO_ADMIN_CMD_BITMAP 0
#define VIRTIO_ADMIN_CMD_BITMAP VIRTIO_DEV_PARTS_ADMIN_CMD_BITMAP
#endif
void vp_modern_avq_done(struct virtqueue *vq);