Support virtio entropy device

[sbutz]

In virtualized deployments seed DRNG from entropy provided by host.

Tbh this driver is of limited use, but was good exercise to get started with virtio.

Arch	mmio	pci
x86_64	✅	✅
aarch64	✅	✅
riscv64	✅	❌ - pci not supported on risc-v

Support for pci devices on risc-v shall be added in a separate PR. Is there already a ticket for that?

Blocked by integration of rust-osdev/virtio-spec-rs#24 and new release of virtio-spec-rs.

Increases code duplication among virtio drivers. #2527 becomes even more pressing.

[github-actions]

Benchmark Results

Details

Benchmark	Current: f0239f1	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	80.59 s	80.34 s	1.00 ❗
startup_benchmark File Size	0.80 MB	0.80 MB	1.00 ❗
Startup Time - 1 core	0.74 s (±0.02 s)	0.75 s (±0.02 s)	0.99
Startup Time - 2 cores	0.74 s (±0.03 s)	0.74 s (±0.02 s)	1.01
Startup Time - 4 cores	0.74 s (±0.02 s)	0.74 s (±0.02 s)	1.00
multithreaded_benchmark Build Time	83.09 s	82.11 s	1.01 ❗
multithreaded_benchmark File Size	0.89 MB	0.86 MB	1.04 ❗
Multithreaded Pi Efficiency - 2 Threads	89.41 % (±5.97 %)	85.89 % (±6.61 %)	1.04
Multithreaded Pi Efficiency - 4 Threads	44.80 % (±2.68 %)	43.43 % (±2.56 %)	1.03
Multithreaded Pi Efficiency - 8 Threads	25.67 % (±1.49 %)	25.76 % (±1.53 %)	1.00
micro_benchmarks Build Time	82.26 s	80.40 s	1.02 ❗
micro_benchmarks File Size	0.90 MB	0.86 MB	1.04 ❗
Scheduling time - 1 thread	65.27 ticks (±2.73 ticks)	62.65 ticks (±4.06 ticks)	1.04
Scheduling time - 2 threads	36.40 ticks (±4.38 ticks)	34.08 ticks (±4.10 ticks)	1.07
Micro - Time for syscall (getpid)	3.37 ticks (±0.62 ticks)	3.45 ticks (±0.58 ticks)	0.98
Memcpy speed - (built_in) block size 4096	77737.11 MByte/s (±54243.70 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	0.94
Memcpy speed - (built_in) block size 1048576	30600.93 MByte/s (±24694.13 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	1.00
Memcpy speed - (built_in) block size 16777216	27465.95 MByte/s (±22702.98 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.04
Memset speed - (built_in) block size 4096	78265.13 MByte/s (±54604.17 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	0.95
Memset speed - (built_in) block size 1048576	31338.52 MByte/s (±25121.09 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	1.00
Memset speed - (built_in) block size 16777216	28239.54 MByte/s (±23182.23 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.04
Memcpy speed - (rust) block size 4096	75426.93 MByte/s (±52553.87 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	1.02
Memcpy speed - (rust) block size 1048576	30391.77 MByte/s (±24538.15 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	27277.87 MByte/s (±22567.60 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	0.99
Memset speed - (rust) block size 4096	75844.51 MByte/s (±52854.23 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	1.02
Memset speed - (rust) block size 1048576	31121.33 MByte/s (±24970.51 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	1.00
Memset speed - (rust) block size 16777216	28056.01 MByte/s (±23052.28 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	0.99
alloc_benchmarks Build Time	75.93 s	74.76 s	1.02 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1
Allocations - Allocation success	91.31 %	91.31 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	61.44 %	61.44 %	1
Allocations - Average Allocation time	5848.77 Ticks (±83.76 Ticks)	5860.58 Ticks (±98.43 Ticks)	1.00
Allocations - Average Allocation time (no fail)	6609.37 Ticks (±115.16 Ticks)	6554.81 Ticks (±92.86 Ticks)	1.01
Allocations - Average Deallocation time	1924.30 Ticks (±253.78 Ticks)	1805.01 Ticks (±250.35 Ticks)	1.07
mutex_benchmark Build Time	76.30 s	79.82 s	0.96 ❗
mutex_benchmark File Size	0.90 MB	0.86 MB	1.04 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.02 ns (±0.42 ns)	12.10 ns (±0.41 ns)	0.99
Mutex Stress Test Average Time per Iteration - 2 Threads	41.66 ns (±2.34 ns)	40.26 ns (±1.68 ns)	1.03

This comment was automatically generated by workflow using github-action-benchmark.

[sbutz]

@mkroening is there a way to execute all clippy ci targets locally?