MSI-X support

[cagatay-y]

cloud-hypervisor only supports MSI-X interrupts for PCI devices, so support for MSI-X is needed to support running on it. Additionally, MSI-X can allow us to set separate interrupt handlers for the configuration change interrupts and queue updates (even per-queue handlers once we have multiple queues) in the future.

[github-actions]

Benchmark Results

Details

Benchmark	Current: d8017b5	Previous: e645fec	Performance Ratio
startup_benchmark Build Time	99.34 s	99.81 s	1.00 ❗
startup_benchmark File Size	0.86 MB	0.86 MB	1.00 ❗
Startup Time - 1 core	0.93 s (±0.04 s)	0.93 s (±0.04 s)	1.00
Startup Time - 2 cores	0.93 s (±0.03 s)	0.96 s (±0.03 s)	0.97
Startup Time - 4 cores	0.95 s (±0.03 s)	0.94 s (±0.03 s)	1.01
multithreaded_benchmark Build Time	96.73 s	102.13 s	0.95 ❗
multithreaded_benchmark File Size	0.97 MB	0.97 MB	1.00 ❗
Multithreaded Pi Efficiency - 2 Threads	87.54 % (±8.46 %)	88.34 % (±8.04 %)	0.99
Multithreaded Pi Efficiency - 4 Threads	43.35 % (±3.49 %)	44.56 % (±3.57 %)	0.97
Multithreaded Pi Efficiency - 8 Threads	25.31 % (±1.71 %)	25.91 % (±1.86 %)	0.98
micro_benchmarks Build Time	94.93 s	100.32 s	0.95 ❗
micro_benchmarks File Size	0.97 MB	0.97 MB	1.00 ❗
Scheduling time - 1 thread	67.50 ticks (±4.49 ticks)	68.60 ticks (±3.48 ticks)	0.98
Scheduling time - 2 threads	37.94 ticks (±4.94 ticks)	40.01 ticks (±5.48 ticks)	0.95
Micro - Time for syscall (getpid)	3.29 ticks (±0.50 ticks)	3.30 ticks (±0.47 ticks)	1.00
Memcpy speed - (built_in) block size 4096	68074.93 MByte/s (±48400.28 MByte/s)	66423.24 MByte/s (±47211.72 MByte/s)	1.02
Memcpy speed - (built_in) block size 1048576	29556.54 MByte/s (±24222.31 MByte/s)	29366.89 MByte/s (±24195.28 MByte/s)	1.01
Memcpy speed - (built_in) block size 16777216	28617.93 MByte/s (±23821.18 MByte/s)	24865.20 MByte/s (±20794.46 MByte/s)	1.15
Memset speed - (built_in) block size 4096	68766.22 MByte/s (±48904.64 MByte/s)	66997.01 MByte/s (±47611.29 MByte/s)	1.03
Memset speed - (built_in) block size 1048576	30329.44 MByte/s (±24663.19 MByte/s)	30137.28 MByte/s (±24628.24 MByte/s)	1.01
Memset speed - (built_in) block size 16777216	29403.88 MByte/s (±24271.54 MByte/s)	25636.38 MByte/s (±21296.15 MByte/s)	1.15
Memcpy speed - (rust) block size 4096	63083.79 MByte/s (±46152.60 MByte/s)	60802.24 MByte/s (±44540.11 MByte/s)	1.04
Memcpy speed - (rust) block size 1048576	29625.75 MByte/s (±24268.11 MByte/s)	29548.98 MByte/s (±24182.47 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	28647.73 MByte/s (±23846.78 MByte/s)	25616.27 MByte/s (±21548.07 MByte/s)	1.12
Memset speed - (rust) block size 4096	64034.43 MByte/s (±46801.57 MByte/s)	61752.87 MByte/s (±45214.15 MByte/s)	1.04
Memset speed - (rust) block size 1048576	30368.04 MByte/s (±24690.85 MByte/s)	30310.81 MByte/s (±24622.20 MByte/s)	1.00
Memset speed - (rust) block size 16777216	29422.31 MByte/s (±24285.72 MByte/s)	26370.24 MByte/s (±22014.77 MByte/s)	1.12
alloc_benchmarks Build Time	93.52 s	94.69 s	0.99 ❗
alloc_benchmarks File Size	0.93 MB	0.93 MB	1.00 ❗
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	100.00 %	100.00 %	1
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	10022.21 Ticks (±133.11 Ticks)	9799.65 Ticks (±144.68 Ticks)	1.02 ❗
Allocations - Average Allocation time (no fail)	10022.21 Ticks (±133.11 Ticks)	9799.65 Ticks (±144.68 Ticks)	1.02 ❗
Allocations - Average Deallocation time	988.99 Ticks (±669.59 Ticks)	919.79 Ticks (±324.70 Ticks)	1.08
mutex_benchmark Build Time	93.20 s	93.42 s	1.00 ❗
mutex_benchmark File Size	0.97 MB	0.97 MB	1.00 ❗
Mutex Stress Test Average Time per Iteration - 1 Threads	12.68 ns (±0.68 ns)	12.86 ns (±0.77 ns)	0.99
Mutex Stress Test Average Time per Iteration - 2 Threads	13.14 ns (±1.06 ns)	13.22 ns (±0.90 ns)	0.99

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