docs: Fix broken link in io_throttling.md

There is a link referencing `rate-limiter` module of `firecracker`, but
that module no longer exsits.

Point the link to a commit with the same date in `fir

docs: Fix broken link in io_throttling.md

There is a link referencing `rate-limiter` module of `firecracker`, but
that module no longer exsits.

Point the link to a commit with the same date in `firecracker` when this
commit was merged to `cloud-hypervisor`.

Format `io_throttling.md` using `mdformat` with GitHub Flavored Markdown
(GFM).

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

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vmm: use RateLimiterGroup for virtio-blk devices

Add a 'rate_limit_groups' field to VmConfig that defines a set of
named RateLimiterGroups.

When the 'rate_limit_group' field of DiskConfig is define

vmm: use RateLimiterGroup for virtio-blk devices

Add a 'rate_limit_groups' field to VmConfig that defines a set of
named RateLimiterGroups.

When the 'rate_limit_group' field of DiskConfig is defined, all
virtio-blk queues will be rate-limited by a shared RateLimiterGroup.
The lifecycle of all RateLimiterGroups is tied to the Vm.
A RateLimiterGroup may exist even if no Disks are configured to use
the RateLimiterGroup. Disks may be hot-added or hot-removed from the
RateLimiterGroup.

When the 'rate_limiter' field of DiskConfig is defined, we construct
an anonymous RateLimiterGroup whose lifecycle is tied to the Disk.
This is primarily done for api backwards compatability. Importantly,
the behavior is not the same! This implementation rate_limits the
aggregate bandwidth / iops of an individual disk rather than the
bandwidth / iops of an individual queue of a disk.

When neither the 'rate_limit_group' or the 'rate_limiter' fields of
DiskConfig is defined, the Disk is not rate-limited.

Signed-off-by: Thomas Barrett <tbarrett@crusoeenergy.com>

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docs: Fix the name of the I/O operations knobs

The I/O operations knobs are prefixed `ops_` rather than `bw_`, as `bw_`
refers to the "bandwidth" knobs.

Signed-off-by: Fabiano Fidêncio <fabiano.fid

docs: Fix the name of the I/O operations knobs

The I/O operations knobs are prefixed `ops_` rather than `bw_`, as `bw_`
refers to the "bandwidth" knobs.

Signed-off-by: Fabiano Fidêncio <fabiano.fidencio@intel.com>

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virtio-devices: Add rate limiter for the RX queue of virtio-net

Fixes: #1286

Signed-off-by: Bo Chen <chen.bo@intel.com>

docs: Add documentation on I/O throttling

Signed-off-by: Bo Chen <chen.bo@intel.com>