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![John Snow](/assets/img/avatar_default.png)
Now that we are fully switched over to the new QMP library, move it back over the old namespace. This is being done primarily so that we may upload this package simply as "qemu.qmp" without introducing confusion over whether or not "aqmp" is a new protocol or not. The trade-off is increased confusion inside the QEMU developer tree. Sorry! Note: the 'private' member "_aqmp" in legacy.py also changes to "_qmp"; not out of necessity, but just to remove any traces of the "aqmp" name. Signed-off-by: John Snow <jsnow@redhat.com> Reviewed-by: Beraldo Leal <bleal@redhat.com> Acked-by: Hanna Reitz <hreitz@redhat.com> Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@openvz.org> Message-id: 20220330172812.3427355-8-jsnow@redhat.com Signed-off-by: John Snow <jsnow@redhat.com>
194 lines
4.8 KiB
Python
194 lines
4.8 KiB
Python
#!/usr/bin/python3
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#
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# SPDX-License-Identifier: GPL-2.0-or-later
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#
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# A script to generate a CSV file showing the x86_64 ABI
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# compatibility levels for each CPU model.
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#
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from qemu.qmp.legacy import QEMUMonitorProtocol
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import sys
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if len(sys.argv) != 2:
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print("syntax: %s QMP-SOCK\n\n" % __file__ +
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"Where QMP-SOCK points to a QEMU process such as\n\n" +
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" # qemu-system-x86_64 -qmp unix:/tmp/qmp,server,nowait " +
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"-display none -accel kvm", file=sys.stderr)
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sys.exit(1)
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# Mandatory CPUID features for each microarch ABI level
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levels = [
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[ # x86-64 baseline
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"cmov",
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"cx8",
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"fpu",
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"fxsr",
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"mmx",
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"syscall",
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"sse",
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"sse2",
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],
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[ # x86-64-v2
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"cx16",
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"lahf-lm",
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"popcnt",
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"pni",
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"sse4.1",
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"sse4.2",
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"ssse3",
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],
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[ # x86-64-v3
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"avx",
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"avx2",
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"bmi1",
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"bmi2",
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"f16c",
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"fma",
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"abm",
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"movbe",
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],
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[ # x86-64-v4
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"avx512f",
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"avx512bw",
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"avx512cd",
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"avx512dq",
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"avx512vl",
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],
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]
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# Assumes externally launched process such as
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#
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# qemu-system-x86_64 -qmp unix:/tmp/qmp,server,nowait -display none -accel kvm
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#
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# Note different results will be obtained with TCG, as
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# TCG masks out certain features otherwise present in
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# the CPU model definitions, as does KVM.
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sock = sys.argv[1]
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shell = QEMUMonitorProtocol(sock)
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shell.connect()
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models = shell.cmd("query-cpu-definitions")
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# These QMP props don't correspond to CPUID fatures
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# so ignore them
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skip = [
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"family",
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"min-level",
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"min-xlevel",
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"vendor",
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"model",
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"model-id",
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"stepping",
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]
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names = []
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for model in models["return"]:
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if "alias-of" in model:
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continue
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names.append(model["name"])
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models = {}
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for name in sorted(names):
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cpu = shell.cmd("query-cpu-model-expansion",
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{ "type": "static",
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"model": { "name": name }})
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got = {}
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for (feature, present) in cpu["return"]["model"]["props"].items():
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if present and feature not in skip:
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got[feature] = True
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if name in ["host", "max", "base"]:
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continue
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models[name] = {
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# Dict of all present features in this CPU model
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"features": got,
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# Whether each x86-64 ABI level is satisfied
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"levels": [False, False, False, False],
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# Number of extra CPUID features compared to the x86-64 ABI level
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"distance":[-1, -1, -1, -1],
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# CPUID features present in model, but not in ABI level
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"delta":[[], [], [], []],
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# CPUID features in ABI level but not present in model
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"missing": [[], [], [], []],
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}
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# Calculate whether the CPU models satisfy each ABI level
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for name in models.keys():
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for level in range(len(levels)):
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got = set(models[name]["features"])
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want = set(levels[level])
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missing = want - got
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match = True
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if len(missing) > 0:
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match = False
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models[name]["levels"][level] = match
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models[name]["missing"][level] = missing
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# Cache list of CPU models satisfying each ABI level
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abi_models = [
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[],
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[],
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[],
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[],
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]
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for name in models.keys():
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for level in range(len(levels)):
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if models[name]["levels"][level]:
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abi_models[level].append(name)
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for level in range(len(abi_models)):
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# Find the union of features in all CPU models satisfying this ABI
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allfeatures = {}
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for name in abi_models[level]:
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for feat in models[name]["features"]:
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allfeatures[feat] = True
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# Find the intersection of features in all CPU models satisfying this ABI
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commonfeatures = []
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for feat in allfeatures:
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present = True
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for name in models.keys():
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if not models[name]["levels"][level]:
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continue
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if feat not in models[name]["features"]:
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present = False
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if present:
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commonfeatures.append(feat)
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# Determine how many extra features are present compared to the lowest
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# common denominator
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for name in models.keys():
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if not models[name]["levels"][level]:
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continue
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delta = set(models[name]["features"].keys()) - set(commonfeatures)
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models[name]["distance"][level] = len(delta)
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models[name]["delta"][level] = delta
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def print_uarch_abi_csv():
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print("# Automatically generated from '%s'" % __file__)
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print("Model,baseline,v2,v3,v4")
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for name in models.keys():
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print(name, end="")
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for level in range(len(levels)):
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if models[name]["levels"][level]:
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print(",✅", end="")
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else:
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print(",", end="")
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print()
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print_uarch_abi_csv()
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