This script is intended to help in synchronizing i386 QEMU cpu
feature definitions with libvirt.
QEMU's attribute list for the "max-x86_64-cpu" contains non-cpu-feature
items and needs to be filtered before being useful.
Signed-off-by: Tim Wiederhake <twiederh@xxxxxxxxxx>
---
src/cpu_map/sync_qemu_features_i386.py | 278 +++++++++++++++++++++++++
1 file changed, 278 insertions(+)
create mode 100755 src/cpu_map/sync_qemu_features_i386.py
diff --git a/src/cpu_map/sync_qemu_features_i386.py b/src/cpu_map/sync_qemu_features_i386.py
new file mode 100755
index 0000000000..fba7d35609
--- /dev/null
+++ b/src/cpu_map/sync_qemu_features_i386.py
@@ -0,0 +1,278 @@
+#!/usr/bin/env python3
+
+import argparse
+import json
+import subprocess
+import xml.etree.ElementTree
+
+
+def ignore_feature(feature):
+ ignored_features = [
+ # VIA/Cyrix/Centaur-defined CPU features
+ # CPUID level 0xC0000001, word 5
+ "ace2",
+ "ace2-en",
+ "phe",
+ "phe-en",
+ "pmm",
+ "pmm-en",
+ "xcrypt",
+ "xcrypt-en",
+ "xstore",
+ "xstore-en",
+
+ # non-features
+ "check",
+ "cpuid-0xb",
+ "enforce",
+ "fill-mtrr-mask",
+ "full-cpuid-auto-level",
+ "full-width-write",
+ "host-cache-info",
+ "host-phys-bits",
+ "hotpluggable",
+ "hotplugged",
+ "hv-apicv",
+ "hv-avic",
+ "hv-crash",
+ "hv-emsr-bitmap",
+ "hv-enforce-cpuid",
+ "hv-evmcs",
+ "hv-frequencies",
+ "hv-ipi",
+ "hv-passthrough",
+ "hv-reenlightenment",
+ "hv-relaxed",
+ "hv-reset",
+ "hv-runtime",
+ "hv-stimer",
+ "hv-stimer-direct",
+ "hv-syndbg",
+ "hv-synic",
+ "hv-time",
+ "hv-tlbflush",
+ "hv-tlbflush-direct",
+ "hv-tlbflush-ext",
+ "hv-vapic",
+ "hv-vpindex",
+ "hv-xmm-input",
+ "kvm",
+ "kvm-asyncpf",
+ "kvm-asyncpf-int",
+ "kvm-hint-dedicated",
+ "kvm-mmu",
+ "kvm-msi-ext-dest-id",
+ "kvm-no-smi-migration",
+ "kvm-nopiodelay",
+ "kvm-poll-control",
+ "kvm-pv-enforce-cpuid",
+ "kvm-pv-eoi",
+ "kvm-pv-ipi",
+ "kvm-pv-sched-yield",
+ "kvm-pv-tlb-flush",
+ "kvm-pv-unhalt",
+ "kvm-steal-time",
+ "kvm_asyncpf",
+ "kvm_asyncpf_int",
+ "kvm_mmu",
+ "kvm_nopiodelay",
+ "kvm_poll_control",
+ "kvm_pv_eoi",
+ "kvm_pv_unhalt",
+ "kvm_steal_time",
+ "kvmclock",
+ "kvmclock-stable-bit",
+ "l3-cache",
+ "legacy-cache",
+ "lmce",
+ "migratable",
+ "pmu",
+ "realized",
+ "start-powered-off",
+ "tcg-cpuid",
+ "vmware-cpuid-freq",
+ "vmx-activity-hlt",
+ "vmx-activity-shutdown",
+ "vmx-activity-wait-sipi",
+ "vmx-apicv-register",
+ "vmx-apicv-vid",
+ "vmx-apicv-x2apic",
+ "vmx-apicv-xapic",
+ "vmx-cr3-load-noexit",
+ "vmx-cr3-store-noexit",
+ "vmx-cr8-load-exit",
+ "vmx-cr8-store-exit",
+ "vmx-desc-exit",
+ "vmx-encls-exit",
+ "vmx-entry-ia32e-mode",
+ "vmx-entry-load-bndcfgs",
+ "vmx-entry-load-efer",
+ "vmx-entry-load-pat",
+ "vmx-entry-load-perf-global-ctrl",
+ "vmx-entry-load-pkrs",
+ "vmx-entry-load-rtit-ctl",
+ "vmx-entry-noload-debugctl",
+ "vmx-ept",
+ "vmx-ept-1gb",
+ "vmx-ept-2mb",
+ "vmx-ept-advanced-exitinfo",
+ "vmx-ept-execonly",
+ "vmx-eptad",
+ "vmx-eptp-switching",
+ "vmx-exit-ack-intr",
+ "vmx-exit-clear-bndcfgs",
+ "vmx-exit-clear-rtit-ctl",
+ "vmx-exit-load-efer",
+ "vmx-exit-load-pat",
+ "vmx-exit-load-perf-global-ctrl",
+ "vmx-exit-load-pkrs",
+ "vmx-exit-nosave-debugctl",
+ "vmx-exit-save-efer",
+ "vmx-exit-save-pat",
+ "vmx-exit-save-preemption-timer",
+ "vmx-flexpriority",
+ "vmx-hlt-exit",
+ "vmx-ins-outs",
+ "vmx-intr-exit",
+ "vmx-invept",
+ "vmx-invept-all-context",
+ "vmx-invept-single-context",
+ "vmx-invept-single-context-noglobals",
+ "vmx-invlpg-exit",
+ "vmx-invpcid-exit",
+ "vmx-invvpid",
+ "vmx-invvpid-all-context",
+ "vmx-invvpid-single-addr",
+ "vmx-io-bitmap",
+ "vmx-io-exit",
+ "vmx-monitor-exit",
+ "vmx-movdr-exit",
+ "vmx-msr-bitmap",
+ "vmx-mtf",
+ "vmx-mwait-exit",
+ "vmx-nmi-exit",
+ "vmx-page-walk-4",
+ "vmx-page-walk-5",
+ "vmx-pause-exit",
+ "vmx-ple",
+ "vmx-pml",
+ "vmx-posted-intr",
+ "vmx-preemption-timer",
+ "vmx-rdpmc-exit",
+ "vmx-rdrand-exit",
+ "vmx-rdseed-exit",
+ "vmx-rdtsc-exit",
+ "vmx-rdtscp-exit",
+ "vmx-secondary-ctls",
+ "vmx-shadow-vmcs",
+ "vmx-store-lma",
+ "vmx-true-ctls",
+ "vmx-tsc-offset",
+ "vmx-tsc-scaling",
+ "vmx-unrestricted-guest",
+ "vmx-vintr-pending",
+ "vmx-vmfunc",
+ "vmx-vmwrite-vmexit-fields",
+ "vmx-vnmi",
+ "vmx-vnmi-pending",
+ "vmx-vpid",
+ "vmx-wbinvd-exit",
+ "vmx-xsaves",
+ "vmx-zero-len-inject",
+ ]
+
+ if feature["type"] != "bool":
+ return True
+
+ name = feature["name"]
+
+ if name.startswith("x-"):
+ return True
+
+ if name in ignored_features:
+ return True
+
+ return False
+
+
+def get_qemu_feature_list(path_to_qemu):
+ cmd = [
+ path_to_qemu,
+ "-machine", "accel=kvm",
+ "-cpu", "host",
+ "-nodefaults",
+ "-nographic",
+ "-qmp",
+ "stdio"
+ ]
+
+ request = """
+ {
+ "execute": "qmp_capabilities"
+ }
+ {
+ "execute": "qom-list-properties",
+ "arguments": {
+ "typename": "max-x86_64-cpu"
+ },
+ "id": "qom-list-properties"
+ }
+ {
+ "execute": "quit"
+ }
+ """
+
+ decoder = json.JSONDecoder()
+ output = subprocess.check_output(cmd, input=request, text=True)
+ while output:
+ obj, idx = decoder.raw_decode(output)
+ output = output[idx:].strip()
+ if obj.get("id") != "qom-list-properties":
+ continue
+ for feature in obj["return"]:
+ if ignore_feature(feature):
+ continue
+ yield feature["name"]
+
+
+def get_libvirt_feature_list(path_to_featuresfile):
+ dom = xml.etree.ElementTree.parse(path_to_featuresfile)
+ for feature in dom.getroot().iter("feature"):
+ yield feature.get("name")
+ for alias in feature:
+ if alias.tag == "alias":
+ yield alias.get("name")
+
+
+def main():
+ parser = argparse.ArgumentParser(
+ description="Synchronize x86 cpu features from QEMU i386 target.")
+ parser.add_argument(
+ "--qemu",
+ help="TODO",
+ default="qemu-kvm",
+ type=str)
+ parser.add_argument(
+ "--features",
+ help="Path to 'src/cpu_map/x86_features.xml' directory in "
+ "the libvirt repository",
+ default="x86_features.xml",
+ type=str)
+
+ args = parser.parse_args()
+
+ qfeatures = get_qemu_feature_list(args.qemu)
+ lfeatures = list(get_libvirt_feature_list(args.features))
+ missing = [f for f in sorted(qfeatures) if f not in lfeatures]
+
+ if missing:
+ print("The following features were reported by qemu but are "
+ "unknown to libvirt:")
+ for feature in missing:
+ print(" *", feature)
+
+ return len(missing) != 0
+
+
+if __name__ == "__main__":
+ exit(main())
--
2.36.1
