x86-64: enable PCIe enhanced configuration support

[zyuiop]

No description provided.

[stlankes]

Looks good for me. Maybe some debug messages would help to see that PCIe is detected. How do test your PR?

[zyuiop]

Hi, I'll add some debug messages. For now, I tested on VMs in which standard PCI device discovery was not available, so I confirmed this works.

[github-actions]

Benchmark Results

Benchmark	Current: 398eb1b	Previous: 916c0d1	Performance Ratio
startup_benchmark Build Time	99.72 s	99.64 s	1.00
startup_benchmark File Size	0.87 MB	0.87 MB	1.01
Startup Time - 1 core	0.88 s (±0.02 s)	0.91 s (±0.02 s)	0.97
Startup Time - 2 cores	0.89 s (±0.02 s)	0.91 s (±0.01 s)	0.98
Startup Time - 4 cores	0.91 s (±0.02 s)	0.92 s (±0.02 s)	0.99
multithreaded_benchmark Build Time	99.87 s	100.90 s	0.99
multithreaded_benchmark File Size	0.98 MB	0.97 MB	1.01
Multithreaded Pi Efficiency - 2 Threads	70.33 % (±6.13 %)	72.02 % (±3.89 %)	0.98
Multithreaded Pi Efficiency - 4 Threads	40.32 % (±2.75 %)	42.13 % (±3.21 %)	0.96
Multithreaded Pi Efficiency - 8 Threads	20.94 % (±1.80 %)	20.62 % (±1.67 %)	1.02
micro_benchmarks Build Time	82.63 s	82.66 s	1.00
micro_benchmarks File Size	0.99 MB	0.98 MB	1.01
Scheduling time - 1 thread	51.03 ticks (±1.19 ticks)	50.76 ticks (±1.58 ticks)	1.01
Scheduling time - 2 threads	31.22 ticks (±5.62 ticks)	29.97 ticks (±4.74 ticks)	1.04
Micro - Time for syscall (getpid)	13.69 ticks (±1.84 ticks)	13.62 ticks (±1.90 ticks)	1.01
Memcpy speed - (built_in) block size 4096	89679.94 MByte/s (±61805.44 MByte/s)	87836.97 MByte/s (±60687.62 MByte/s)	1.02
Memcpy speed - (built_in) block size 1048576	44150.75 MByte/s (±30516.18 MByte/s)	44377.25 MByte/s (±30655.67 MByte/s)	0.99
Memcpy speed - (built_in) block size 16777216	30100.54 MByte/s (±24699.95 MByte/s)	30073.21 MByte/s (±24686.15 MByte/s)	1.00
Memset speed - (built_in) block size 4096	89875.60 MByte/s (±61947.13 MByte/s)	87609.46 MByte/s (±60567.75 MByte/s)	1.03
Memset speed - (built_in) block size 1048576	44359.82 MByte/s (±30658.99 MByte/s)	44601.88 MByte/s (±30809.54 MByte/s)	0.99
Memset speed - (built_in) block size 16777216	30869.61 MByte/s (±25140.82 MByte/s)	30861.29 MByte/s (±25146.75 MByte/s)	1.00
Memcpy speed - (rust) block size 4096	79538.43 MByte/s (±55193.44 MByte/s)	78085.94 MByte/s (±54382.07 MByte/s)	1.02
Memcpy speed - (rust) block size 1048576	44099.41 MByte/s (±30486.42 MByte/s)	44176.28 MByte/s (±30556.63 MByte/s)	1.00
Memcpy speed - (rust) block size 16777216	29985.26 MByte/s (±24598.82 MByte/s)	30071.23 MByte/s (±24675.89 MByte/s)	1.00
Memset speed - (rust) block size 4096	79984.86 MByte/s (±55500.79 MByte/s)	78452.24 MByte/s (±54650.22 MByte/s)	1.02
Memset speed - (rust) block size 1048576	44316.18 MByte/s (±30633.57 MByte/s)	44416.03 MByte/s (±30723.13 MByte/s)	1.00
Memset speed - (rust) block size 16777216	30760.57 MByte/s (±25048.33 MByte/s)	30862.88 MByte/s (±25137.48 MByte/s)	1.00
alloc_benchmarks Build Time	79.52 s	79.90 s	1.00
alloc_benchmarks File Size	0.94 MB	0.94 MB	1.01
Allocations - Allocation success	100.00 %	100.00 %	1
Allocations - Deallocation success	70.05 % (±0.27 %)	69.94 % (±0.25 %)	1.00
Allocations - Pre-fail Allocations	100.00 %	100.00 %	1
Allocations - Average Allocation time	9554.74 Ticks (±154.50 Ticks)	10148.44 Ticks (±733.14 Ticks)	0.94
Allocations - Average Allocation time (no fail)	9554.74 Ticks (±154.50 Ticks)	10148.44 Ticks (±733.14 Ticks)	0.94
Allocations - Average Deallocation time	656.80 Ticks (±15.10 Ticks)	662.38 Ticks (±35.19 Ticks)	0.99
mutex_benchmark Build Time	81.01 s	80.36 s	1.01
mutex_benchmark File Size	0.99 MB	0.98 MB	1.01
Mutex Stress Test Average Time per Iteration - 1 Threads	11.72 ns (±0.45 ns)	11.50 ns (±0.50 ns)	1.02
Mutex Stress Test Average Time per Iteration - 2 Threads	13.64 ns (±0.62 ns)	12.88 ns (±0.71 ns)	1.06

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

[mkroening]

For now, I tested on VMs in which standard PCI device discovery was not available, so I confirmed this works.

I think Stefan is interested in some example QEMU flags for running this. :D