[libvirt PATCH 07/29] cpu-gather: Move msr decoding to new script
Fixes the leaking file descriptors. Does not silently ignore errors
(e.g. permission denied on /dev/cpu/0/msr if run as non-root) and
always attempt to read from /dev/kvm if /dev/cpu/0/msr failed.
'gather_msr()' returns a dictionary of values, as a later patch will
add more registers to be interrogated.
Signed-off-by: Tim Wiederhake <twiederh(a)redhat.com>
---
tests/cputestdata/cpu-gather.py | 34 ++++++++++++++++++++++++++++
tests/cputestdata/cpu-gather.sh | 40 ---------------------------------
2 files changed, 34 insertions(+), 40 deletions(-)
diff --git a/tests/cputestdata/cpu-gather.py b/tests/cputestdata/cpu-gather.py
index 75cf290a28..db2348b460 100755
--- a/tests/cputestdata/cpu-gather.py
+++ b/tests/cputestdata/cpu-gather.py
@@ -1,8 +1,11 @@
#!/usr/bin/env python3
import argparse
+import fcntl
import os
+import struct
import subprocess
+import sys
def gather_name(args):
@@ -38,6 +41,31 @@ def gather_cpuid_leaves(args):
yield line.strip()
+def gather_msr():
+ IA32_ARCH_CAPABILITIES_MSR = 0x10a
+ KVM_GET_MSRS = 0xc008ae88
+
+ try:
+ with open("/dev/cpu/0/msr", "rb") as f:
+ f.seek(IA32_ARCH_CAPABILITIES_MSR)
+ buf = f.read(8)
+ msr = struct.unpack("=Q", buf)[0]
+ return "", {IA32_ARCH_CAPABILITIES_MSR: msr}
+ except IOError as e:
+ print("Warning: {}".format(e), file=sys.stderr)
+
+ try:
+ bufIn = struct.pack("=LLLLQ", 1, 0, IA32_ARCH_CAPABILITIES_MSR, 0, 0)
+ with open("/dev/kvm", "rb") as f:
+ bufOut = fcntl.ioctl(f, KVM_GET_MSRS, bufIn)
+ msr = struct.unpack("=LLLLQ", bufOut)[4]
+ return " via KVM", {IA32_ARCH_CAPABILITIES_MSR: msr}
+ except IOError as e:
+ print("Warning: {}".format(e), file=sys.stderr)
+
+ return None, {}
+
+
def main():
parser = argparse.ArgumentParser(description="Gather cpu test data")
parser.add_argument(
@@ -61,6 +89,12 @@ def main():
print(" {}".format(leave))
print()
+ via, msr = gather_msr()
+ if via is not None:
+ print("MSR{}:".format(via))
+ for key, value in sorted(msr.items()):
+ print(" 0x{:x}: 0x{:016x}\n".format(int(key), value))
+
print(end="", flush=True)
os.environ["CPU_GATHER_PY"] = "true"
subprocess.check_call("./cpu-gather.sh")
diff --git a/tests/cputestdata/cpu-gather.sh b/tests/cputestdata/cpu-gather.sh
index f84215e777..427b81a64b 100755
--- a/tests/cputestdata/cpu-gather.sh
+++ b/tests/cputestdata/cpu-gather.sh
@@ -5,46 +5,6 @@ if [ -z "${CPU_GATHER_PY}" ]; then
exit 1
fi
-python3 <<EOF
-from struct import pack, unpack
-from fcntl import ioctl
-import sys, errno
-
-IA32_ARCH_CAPABILITIES_MSR = 0x10a
-KVM_GET_MSRS = 0xc008ae88
-
-def print_msr(msr, via=None):
- if via is None:
- print("MSR:")
- else:
- print("MSR via %s:" % via)
- print(" 0x%x: 0x%016x" % (IA32_ARCH_CAPABILITIES_MSR, msr))
- print()
-
-try:
- fd = open("/dev/cpu/0/msr", "rb")
- fd.seek(IA32_ARCH_CAPABILITIES_MSR)
- buf = fd.read(8)
- msr = unpack("=Q", buf)[0]
-
- print_msr(msr)
- sys.exit(0)
-except IOError as e:
- # The MSR is not supported on the host
- if e.errno == errno.EIO:
- sys.exit(0)
-
-try:
- fd = open("/dev/kvm", "r")
- bufIn = pack("=LLLLQ", 1, 0, IA32_ARCH_CAPABILITIES_MSR, 0, 0)
- bufOut = ioctl(fd, KVM_GET_MSRS, bufIn)
- msr = unpack("=LLLLQ", bufOut)[4]
-
- print_msr(msr, via="KVM")
-except IOError as e:
- pass
-EOF
-
qemu=qemu-system-x86_64
for cmd in /usr/bin/$qemu /usr/bin/qemu-kvm /usr/libexec/qemu-kvm; do
if [[ -x $cmd ]]; then
--
2.26.2