The new command can be used to generate test data for virCPUUpdateLive.
When "cpu-cpuid.py diff x86-cpuid-Something.json" is run, it reads raw
CPUID data stored in x86-cpuid-Something.xml and CPUID data from QEMU
stored in x86-cpuid-Something.json to produce two more CPUID files:
x86-cpuid-Something-enabled.xml and x86-cpuid-Something-disabled.xml.
- x86-cpuid-Something-enabled.xml will contain CPUID bits present in
x86-cpuid-Something.json (i.e., enabled by QEMU for the "host" CPU)
- x86-cpuid-Something-disabled.xml will contain all CPUID bits from
x86-cpuid-Something.xml which are not present in
x86-cpuid-Something.json (i.e., CPUID bits which the host CPU
supports, but QEMU does not enable them for the "host" CPU)
Signed-off-by: Jiri Denemark <jdenemar@xxxxxxxxxx>
---
tests/cputestdata/cpu-cpuid.py | 89 +++++++++++++++++++++++++++++++++++++++++-
tests/cputestdata/cpu-parse.sh | 1 +
2 files changed, 89 insertions(+), 1 deletion(-)
diff --git a/tests/cputestdata/cpu-cpuid.py b/tests/cputestdata/cpu-cpuid.py
index f4cf6d440..4b9b04ace 100755
--- a/tests/cputestdata/cpu-cpuid.py
+++ b/tests/cputestdata/cpu-cpuid.py
@@ -2,6 +2,7 @@
import sys
import json
+import xmltodict
# This is a list of x86 CPU features as of QEMU 2.8.50 and it won't need any
# updates since in the future because query-cpu-model-expansion will be used
@@ -171,6 +172,16 @@ cpuidMap = [
]
+def reverseCpuidMap():
+ features = {}
+
+ for feature in cpuidMap:
+ for name in feature["names"]:
+ features[name] = feature
+
+ return features
+
+
def cpuidIsSet(cpuid, feature):
in_eax = feature["in_eax"]
in_ecx = feature["in_ecx"]
@@ -201,6 +212,12 @@ def cpuidLeaf(cpuid, in_eax, in_ecx):
return leaf
+def cpuidAdd(cpuid, feature):
+ leaf = cpuidLeaf(cpuid, feature["in_eax"], feature["in_ecx"])
+ for reg in ["eax", "ebx", "ecx", "edx"]:
+ leaf[reg] |= feature[reg]
+
+
def parseFeatureWords(path):
features = None
@@ -240,6 +257,50 @@ def parseFeatureWords(path):
return props, cpuid
+def parseQemu(path, features):
+ cpuid = {}
+ with open(path, "r") as f:
+ data = json.load(f)
+
+ for (prop, val) in data["return"]["model"]["props"].iteritems():
+ if val and prop in features:
+ cpuidAdd(cpuid, features[prop])
+
+ return cpuid
+
+
+def parseCpuid(path):
+ cpuid = {}
+ with open(path, "r") as f:
+ data = xmltodict.parse(f)
+
+ for leaf in data["cpudata"]["cpuid"]:
+ leaf["in_eax"] = int(leaf["@eax_in"], 0)
+ leaf["in_ecx"] = int(leaf["@ecx_in"], 0)
+ for reg in ["eax", "ebx", "ecx", "edx"]:
+ leaf[reg] = int(leaf["@" + reg], 0)
+
+ cpuidAdd(cpuid, leaf)
+
+ return cpuid
+
+
+def formatCpuid(cpuid, path, comment):
+ with open(path, "w") as f:
+ f.write("<!-- " + comment + " -->\n")
+ f.write("<cpudata arch='x86'>\n")
+ for in_eax in sorted(cpuid.keys()):
+ for in_ecx in sorted(cpuid[in_eax].keys()):
+ leaf = cpuid[in_eax][in_ecx]
+ line = " <cpuid eax_in='0x%08x' ecx_in='0x%02x' "
+ line += "eax='0x%08x' ebx='0x%08x' "
+ line += "ecx='0x%08x' edx='0x%08x'/>\n"
+ f.write(line %(
+ in_eax, in_ecx,
+ leaf["eax"], leaf["ebx"], leaf["ecx"], leaf["edx"]))
+ f.write("</cpudata>\n")
+
+
def convert(path):
props, cpuid = parseFeatureWords(path)
@@ -255,8 +316,30 @@ def convert(path):
f.write("\n")
+def diff(features, path):
+ base = path.replace(".json", "")
+ jsonFile = path
+ cpuidFile = base + ".xml"
+ enabledFile = base + "-enabled.xml"
+ disabledFile = base + "-disabled.xml"
+
+ cpuid = parseCpuid(cpuidFile)
+ qemu = parseQemu(jsonFile, features)
+
+ enabled = {}
+ disabled = {}
+ for feature in cpuidMap:
+ if cpuidIsSet(qemu, feature):
+ cpuidAdd(enabled, feature)
+ elif cpuidIsSet(cpuid, feature):
+ cpuidAdd(disabled, feature)
+
+ formatCpuid(enabled, enabledFile, "Features enabled by QEMU")
+ formatCpuid(disabled, disabledFile, "Features disabled by QEMU")
+
+
if len(sys.argv) < 3:
- print "Usage: %s convert json_file..." % sys.argv[0]
+ print "Usage: %s convert|diff json_file..." % sys.argv[0]
sys.exit(1)
action = sys.argv[1]
@@ -265,6 +348,10 @@ args = sys.argv[2:]
if action == "convert":
for path in args:
convert(path)
+elif action == "diff":
+ features = reverseCpuidMap()
+ for path in args:
+ diff(features, path)
else:
print "Unknown action: " + action
sys.exit(1)
diff --git a/tests/cputestdata/cpu-parse.sh b/tests/cputestdata/cpu-parse.sh
index d823c399b..cd1ab024b 100755
--- a/tests/cputestdata/cpu-parse.sh
+++ b/tests/cputestdata/cpu-parse.sh
@@ -55,6 +55,7 @@ if [[ -s $fname.json ]]; then
if ! grep -q model-expansion $fname.json; then
$(dirname $0)/cpu-cpuid.py convert $fname.json
fi
+ $(dirname $0)/cpu-cpuid.py diff $fname.json
else
rm $fname.json
fi
--
2.12.0
--
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