qemu-e2k/hw/block
Daniil Tatianin d74c30c811 virtio: introduce VirtIOConfigSizeParams & virtio_get_config_size
This is the first step towards moving all device config size calculation
logic into the virtio core code. In particular, this adds a struct that
contains all the necessary information for common virtio code to be able
to calculate the final config size for a device. This is expected to be
used with the new virtio_get_config_size helper, which calculates the
final length based on the provided host features.

This builds on top of already existing code like VirtIOFeature and
virtio_feature_get_config_size(), but adds additional fields, as well as
sanity checking so that device-specifc code doesn't have to duplicate it.

An example usage would be:

    static const VirtIOFeature dev_features[] = {
        {.flags = 1ULL << FEATURE_1_BIT,
         .end = endof(struct virtio_dev_config, feature_1)},
        {.flags = 1ULL << FEATURE_2_BIT,
         .end = endof(struct virtio_dev_config, feature_2)},
        {}
    };

    static const VirtIOConfigSizeParams dev_cfg_size_params = {
        .min_size = DEV_BASE_CONFIG_SIZE,
        .max_size = sizeof(struct virtio_dev_config),
        .feature_sizes = dev_features
    };

    // code inside my_dev_device_realize()
    size_t config_size = virtio_get_config_size(&dev_cfg_size_params,
                                                host_features);
    virtio_init(vdev, VIRTIO_ID_MYDEV, config_size);

Currently every device is expected to write its own boilerplate from the
example above in device_realize(), however, the next step of this
transition is moving VirtIOConfigSizeParams into VirtioDeviceClass,
so that it can be done automatically by the virtio initialization code.

All of the users of virtio_feature_get_config_size have been converted
to use virtio_get_config_size so it's no longer needed and is removed
with this commit.

Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Message-Id: <20220906073111.353245-2-d-tatianin@yandex-team.ru>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2022-10-07 09:41:51 -04:00
..
dataplane virtio-scsi: fix race in virtio_scsi_dataplane_start() 2022-08-17 07:07:37 -04:00
block.c block: add missed block_acct_setup with new block device init procedure 2022-09-30 18:42:34 +02:00
cdrom.c Include qemu-common.h exactly where needed 2019-06-12 13:20:20 +02:00
ecc.c vmstate: Constify some VMStateDescriptions 2021-05-02 17:24:50 +02:00
fdc-internal.h hw/block/fdc: Declare shared prototypes in fdc-internal.h 2021-06-25 08:53:28 -04:00
fdc-isa.c acpi: fdc-isa: replace ISADeviceClass::build_aml with AcpiDevAmlIfClass:build_dev_aml 2022-06-09 19:32:48 -04:00
fdc-sysbus.c hw/block/fdc-sysbus: Always mark sysbus floppy controllers as not having DMA 2022-06-11 11:36:14 +02:00
fdc.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
hd-geometry.c hw/block/hd-geometry: Do not override specified bios-chs-trans 2022-08-02 11:21:56 +02:00
Kconfig hw/block/fdc: Extract SysBus floppy controllers to fdc-sysbus.c 2021-06-25 08:53:28 -04:00
m25p80.c hw: m25p80: Add Block Protect and Top Bottom bits for write protect 2022-07-14 16:24:38 +02:00
meson.build hw/block/fdc: Extract SysBus floppy controllers to fdc-sysbus.c 2021-06-25 08:53:28 -04:00
nand.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
onenand.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
pflash_cfi01.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
pflash_cfi02.c block: Change blk_{pread,pwrite}() param order 2022-07-12 12:14:56 +02:00
swim.c qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
tc58128.c hw/sh4: Add missing license 2021-03-06 16:18:42 +01:00
trace-events hw/block/fdc: Extract SysBus floppy controllers to fdc-sysbus.c 2021-06-25 08:53:28 -04:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vhost-user-blk.c hw/virtio: move vhd->started check into helper and add FIXME 2022-10-07 09:41:51 -04:00
virtio-blk.c virtio: introduce VirtIOConfigSizeParams & virtio_get_config_size 2022-10-07 09:41:51 -04:00
xen_blkif.h xen: Import other xen/io/*.h 2019-06-24 10:42:30 +01:00
xen-block.c block: get rid of blk->guest_block_size 2022-06-24 17:07:06 +02:00