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: f22e6c5	Previous: 2e23902	Performance Ratio
startup_benchmark Build Time	81.50 s	80.34 s	1.01 ❗
startup_benchmark File Size	0.80 MB	0.80 MB	1.00 ❗
Startup Time - 1 core	0.73 s (±0.02 s)	0.75 s (±0.02 s)	0.98
Startup Time - 2 cores	0.75 s (±0.02 s)	0.74 s (±0.02 s)	1.01
Startup Time - 4 cores	0.75 s (±0.03 s)	0.74 s (±0.02 s)	1.02
multithreaded_benchmark Build Time	83.76 s	82.11 s	1.02 ❗
multithreaded_benchmark File Size	0.89 MB	0.86 MB	1.04 ❗
Multithreaded Pi Efficiency - 2 Threads	88.39 % (±6.07 %)	85.89 % (±6.61 %)	1.03
Multithreaded Pi Efficiency - 4 Threads	44.05 % (±2.67 %)	43.43 % (±2.56 %)	1.01
Multithreaded Pi Efficiency - 8 Threads	25.69 % (±1.33 %)	25.76 % (±1.53 %)	1.00
micro_benchmarks Build Time	82.18 s	80.40 s	1.02 ❗
micro_benchmarks File Size	0.89 MB	0.86 MB	1.04 ❗
Scheduling time - 1 thread	66.05 ticks (±3.21 ticks)	62.65 ticks (±4.06 ticks)	1.05
Scheduling time - 2 threads	37.21 ticks (±4.77 ticks)	34.08 ticks (±4.10 ticks)	1.09
Micro - Time for syscall (getpid)	3.38 ticks (±0.59 ticks)	3.45 ticks (±0.58 ticks)	0.98
Memcpy speed - (built_in) block size 4096	82382.36 MByte/s (±56950.53 MByte/s)	82448.38 MByte/s (±56997.13 MByte/s)	1.00
Memcpy speed - (built_in) block size 1048576	30510.55 MByte/s (±24681.83 MByte/s)	30585.98 MByte/s (±24707.84 MByte/s)	1.00
Memcpy speed - (built_in) block size 16777216	27214.74 MByte/s (±22495.83 MByte/s)	26340.06 MByte/s (±21720.96 MByte/s)	1.03
Memset speed - (built_in) block size 4096	82540.32 MByte/s (±57065.81 MByte/s)	82292.76 MByte/s (±56891.50 MByte/s)	1.00
Memset speed - (built_in) block size 1048576	31270.27 MByte/s (±25115.44 MByte/s)	31323.85 MByte/s (±25145.86 MByte/s)	1.00
Memset speed - (built_in) block size 16777216	27995.24 MByte/s (±22983.99 MByte/s)	27104.68 MByte/s (±22209.94 MByte/s)	1.03
Memcpy speed - (rust) block size 4096	77705.02 MByte/s (±54057.79 MByte/s)	74097.96 MByte/s (±51811.44 MByte/s)	1.05
Memcpy speed - (rust) block size 1048576	30497.11 MByte/s (±24690.90 MByte/s)	30361.60 MByte/s (±24602.37 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	27593.67 MByte/s (±22778.09 MByte/s)	27625.34 MByte/s (±22806.88 MByte/s)	1.00
Memset speed - (rust) block size 4096	77658.87 MByte/s (±54035.32 MByte/s)	74373.47 MByte/s (±51976.48 MByte/s)	1.04
Memset speed - (rust) block size 1048576	31261.38 MByte/s (±25132.65 MByte/s)	31110.89 MByte/s (±25033.24 MByte/s)	1.00
Memset speed - (rust) block size 16777216	28374.50 MByte/s (±23259.71 MByte/s)	28386.93 MByte/s (±23265.03 MByte/s)	1.00
alloc_benchmarks Build Time	75.47 s	74.76 s	1.01 ❗
alloc_benchmarks File Size	0.87 MB	0.87 MB	1.00 ❗
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	5538.91 Ticks (±109.22 Ticks)	5860.58 Ticks (±98.43 Ticks)	0.95 ❗
Allocations - Average Allocation time (no fail)	6194.60 Ticks (±124.85 Ticks)	6554.81 Ticks (±92.86 Ticks)	0.95 ❗
Allocations - Average Deallocation time	1360.28 Ticks (±321.62 Ticks)	1805.01 Ticks (±250.35 Ticks)	0.75 ❗
mutex_benchmark Build Time	75.09 s	79.82 s	0.94 ❗
mutex_benchmark File Size	0.90 MB	0.86 MB	1.04 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.00 ns (±0.00 ns)	12.10 ns (±0.41 ns)	0.99
Mutex Stress Test Average Time per Iteration - 2 Threads	41.72 ns (±2.22 ns)	40.26 ns (±1.68 ns)	1.04

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