From e02cda008591317b1625707ff8e115a4841aa889 Mon Sep 17 00:00:00 2001
From: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Date: Tue, 10 Oct 2023 11:40:56 +0000
Subject: Introduce Virtio-loopback epsilon release:
Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.
Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9
---
scripts/kvm/kvm_flightrecorder | 126 +++++++++++++++++++
scripts/kvm/vmxcap | 280 +++++++++++++++++++++++++++++++++++++++++
2 files changed, 406 insertions(+)
create mode 100755 scripts/kvm/kvm_flightrecorder
create mode 100755 scripts/kvm/vmxcap
(limited to 'scripts/kvm')
diff --git a/scripts/kvm/kvm_flightrecorder b/scripts/kvm/kvm_flightrecorder
new file mode 100755
index 000000000..78ca3af9c
--- /dev/null
+++ b/scripts/kvm/kvm_flightrecorder
@@ -0,0 +1,126 @@
+#!/usr/bin/env python3
+#
+# KVM Flight Recorder - ring buffer tracing script
+#
+# Copyright (C) 2012 IBM Corp
+#
+# Author: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
+#
+# This script provides a command-line interface to kvm ftrace and is designed
+# to be used as a flight recorder that is always running. To start in-memory
+# recording:
+#
+# sudo kvm_flightrecorder start 8192 # 8 MB per-cpu ring buffers
+#
+# The per-cpu ring buffer size can be given in KB as an optional argument to
+# the 'start' subcommand.
+#
+# To stop the flight recorder:
+#
+# sudo kvm_flightrecorder stop
+#
+# To dump the contents of the flight recorder (this can be done when the
+# recorder is stopped or while it is running):
+#
+# sudo kvm_flightrecorder dump >/path/to/dump.txt
+#
+# To observe the trace while it is running, use the 'tail' subcommand:
+#
+# sudo kvm_flightrecorder tail
+#
+# Note that the flight recorder may impact overall system performance by
+# consuming CPU cycles. No disk I/O is performed since the ring buffer holds a
+# fixed-size in-memory trace.
+
+import sys
+import os
+
+tracing_dir = '/sys/kernel/debug/tracing'
+
+def trace_path(*args):
+ return os.path.join(tracing_dir, *args)
+
+def write_file(path, data):
+ open(path, 'wb').write(data)
+
+def enable_event(subsystem, event, enable):
+ write_file(trace_path('events', subsystem, event, 'enable'), '1' if enable else '0')
+
+def enable_subsystem(subsystem, enable):
+ write_file(trace_path('events', subsystem, 'enable'), '1' if enable else '0')
+
+def start_tracing():
+ enable_subsystem('kvm', True)
+ write_file(trace_path('tracing_on'), '1')
+
+def stop_tracing():
+ write_file(trace_path('tracing_on'), '0')
+ enable_subsystem('kvm', False)
+ write_file(trace_path('events', 'enable'), '0')
+ write_file(trace_path('current_tracer'), 'nop')
+
+def dump_trace():
+ tracefile = open(trace_path('trace'), 'r')
+ try:
+ lines = True
+ while lines:
+ lines = tracefile.readlines(64 * 1024)
+ sys.stdout.writelines(lines)
+ except KeyboardInterrupt:
+ pass
+
+def tail_trace():
+ try:
+ for line in open(trace_path('trace_pipe'), 'r'):
+ sys.stdout.write(line)
+ except KeyboardInterrupt:
+ pass
+
+def usage():
+ print('Usage: %s start [buffer_size_kb] | stop | dump | tail' % sys.argv[0])
+ print('Control the KVM flight recorder tracing.')
+ sys.exit(0)
+
+def main():
+ if len(sys.argv) < 2:
+ usage()
+
+ cmd = sys.argv[1]
+ if cmd == '--version':
+ print('kvm_flightrecorder version 1.0')
+ sys.exit(0)
+
+ if not os.path.isdir(tracing_dir):
+ print('Unable to tracing debugfs directory, try:')
+ print('mount -t debugfs none /sys/kernel/debug')
+ sys.exit(1)
+ if not os.access(tracing_dir, os.W_OK):
+ print('Unable to write to tracing debugfs directory, please run as root')
+ sys.exit(1)
+
+ if cmd == 'start':
+ stop_tracing() # clean up first
+
+ if len(sys.argv) == 3:
+ try:
+ buffer_size_kb = int(sys.argv[2])
+ except ValueError:
+ print('Invalid per-cpu trace buffer size in KB')
+ sys.exit(1)
+ write_file(trace_path('buffer_size_kb'), str(buffer_size_kb))
+ print('Per-CPU ring buffer size set to %d KB' % buffer_size_kb)
+
+ start_tracing()
+ print('KVM flight recorder enabled')
+ elif cmd == 'stop':
+ stop_tracing()
+ print('KVM flight recorder disabled')
+ elif cmd == 'dump':
+ dump_trace()
+ elif cmd == 'tail':
+ tail_trace()
+ else:
+ usage()
+
+if __name__ == '__main__':
+ sys.exit(main())
diff --git a/scripts/kvm/vmxcap b/scripts/kvm/vmxcap
new file mode 100755
index 000000000..6fe66d5f5
--- /dev/null
+++ b/scripts/kvm/vmxcap
@@ -0,0 +1,280 @@
+#!/usr/bin/env python3
+#
+# tool for querying VMX capabilities
+#
+# Copyright 2009-2010 Red Hat, Inc.
+#
+# Authors:
+# Avi Kivity <avi@redhat.com>
+#
+# This work is licensed under the terms of the GNU GPL, version 2. See
+# the COPYING file in the top-level directory.
+
+MSR_IA32_VMX_BASIC = 0x480
+MSR_IA32_VMX_PINBASED_CTLS = 0x481
+MSR_IA32_VMX_PROCBASED_CTLS = 0x482
+MSR_IA32_VMX_EXIT_CTLS = 0x483
+MSR_IA32_VMX_ENTRY_CTLS = 0x484
+MSR_IA32_VMX_MISC_CTLS = 0x485
+MSR_IA32_VMX_PROCBASED_CTLS2 = 0x48B
+MSR_IA32_VMX_EPT_VPID_CAP = 0x48C
+MSR_IA32_VMX_TRUE_PINBASED_CTLS = 0x48D
+MSR_IA32_VMX_TRUE_PROCBASED_CTLS = 0x48E
+MSR_IA32_VMX_TRUE_EXIT_CTLS = 0x48F
+MSR_IA32_VMX_TRUE_ENTRY_CTLS = 0x490
+MSR_IA32_VMX_VMFUNC = 0x491
+
+class msr(object):
+ def __init__(self):
+ try:
+ self.f = open('/dev/cpu/0/msr', 'rb', 0)
+ except:
+ self.f = open('/dev/msr0', 'rb', 0)
+ def read(self, index, default = None):
+ import struct
+ self.f.seek(index)
+ try:
+ return struct.unpack('Q', self.f.read(8))[0]
+ except:
+ return default
+
+class Control(object):
+ def __init__(self, name, bits, cap_msr, true_cap_msr = None):
+ self.name = name
+ self.bits = bits
+ self.cap_msr = cap_msr
+ self.true_cap_msr = true_cap_msr
+ def read2(self, nr):
+ m = msr()
+ val = m.read(nr, 0)
+ return (val & 0xffffffff, val >> 32)
+ def show(self):
+ print(self.name)
+ mb1, cb1 = self.read2(self.cap_msr)
+ tmb1, tcb1 = 0, 0
+ if self.true_cap_msr:
+ tmb1, tcb1 = self.read2(self.true_cap_msr)
+ for bit in sorted(self.bits.keys()):
+ zero = not (mb1 & (1 << bit))
+ one = cb1 & (1 << bit)
+ true_zero = not (tmb1 & (1 << bit))
+ true_one = tcb1 & (1 << bit)
+ s= '?'
+ if (self.true_cap_msr and true_zero and true_one
+ and one and not zero):
+ s = 'default'
+ elif zero and not one:
+ s = 'no'
+ elif one and not zero:
+ s = 'forced'
+ elif one and zero:
+ s = 'yes'
+ print(' %-40s %s' % (self.bits[bit], s))
+
+class Misc(object):
+ def __init__(self, name, bits, msr):
+ self.name = name
+ self.bits = bits
+ self.msr = msr
+ def show(self):
+ print(self.name)
+ value = msr().read(self.msr, 0)
+ print(' Hex: 0x%x' % (value))
+ def first_bit(key):
+ if type(key) is tuple:
+ return key[0]
+ else:
+ return key
+ for bits in sorted(self.bits.keys(), key = first_bit):
+ if type(bits) is tuple:
+ lo, hi = bits
+ fmt = int
+ else:
+ lo = hi = bits
+ def fmt(x):
+ return { True: 'yes', False: 'no' }[x]
+ v = (value >> lo) & ((1 << (hi - lo + 1)) - 1)
+ print(' %-40s %s' % (self.bits[bits], fmt(v)))
+
+controls = [
+ Misc(
+ name = 'Basic VMX Information',
+ bits = {
+ (0, 30): 'Revision',
+ (32,44): 'VMCS size',
+ 48: 'VMCS restricted to 32 bit addresses',
+ 49: 'Dual-monitor support',
+ (50, 53): 'VMCS memory type',
+ 54: 'INS/OUTS instruction information',
+ 55: 'IA32_VMX_TRUE_*_CTLS support',
+ },
+ msr = MSR_IA32_VMX_BASIC,
+ ),
+ Control(
+ name = 'pin-based controls',
+ bits = {
+ 0: 'External interrupt exiting',
+ 3: 'NMI exiting',
+ 5: 'Virtual NMIs',
+ 6: 'Activate VMX-preemption timer',
+ 7: 'Process posted interrupts',
+ },
+ cap_msr = MSR_IA32_VMX_PINBASED_CTLS,
+ true_cap_msr = MSR_IA32_VMX_TRUE_PINBASED_CTLS,
+ ),
+
+ Control(
+ name = 'primary processor-based controls',
+ bits = {
+ 2: 'Interrupt window exiting',
+ 3: 'Use TSC offsetting',
+ 7: 'HLT exiting',
+ 9: 'INVLPG exiting',
+ 10: 'MWAIT exiting',
+ 11: 'RDPMC exiting',
+ 12: 'RDTSC exiting',
+ 15: 'CR3-load exiting',
+ 16: 'CR3-store exiting',
+ 19: 'CR8-load exiting',
+ 20: 'CR8-store exiting',
+ 21: 'Use TPR shadow',
+ 22: 'NMI-window exiting',
+ 23: 'MOV-DR exiting',
+ 24: 'Unconditional I/O exiting',
+ 25: 'Use I/O bitmaps',
+ 27: 'Monitor trap flag',
+ 28: 'Use MSR bitmaps',
+ 29: 'MONITOR exiting',
+ 30: 'PAUSE exiting',
+ 31: 'Activate secondary control',
+ },
+ cap_msr = MSR_IA32_VMX_PROCBASED_CTLS,
+ true_cap_msr = MSR_IA32_VMX_TRUE_PROCBASED_CTLS,
+ ),
+
+ Control(
+ name = 'secondary processor-based controls',
+ bits = {
+ 0: 'Virtualize APIC accesses',
+ 1: 'Enable EPT',
+ 2: 'Descriptor-table exiting',
+ 3: 'Enable RDTSCP',
+ 4: 'Virtualize x2APIC mode',
+ 5: 'Enable VPID',
+ 6: 'WBINVD exiting',
+ 7: 'Unrestricted guest',
+ 8: 'APIC register emulation',
+ 9: 'Virtual interrupt delivery',
+ 10: 'PAUSE-loop exiting',
+ 11: 'RDRAND exiting',
+ 12: 'Enable INVPCID',
+ 13: 'Enable VM functions',
+ 14: 'VMCS shadowing',
+ 15: 'Enable ENCLS exiting',
+ 16: 'RDSEED exiting',
+ 17: 'Enable PML',
+ 18: 'EPT-violation #VE',
+ 19: 'Conceal non-root operation from PT',
+ 20: 'Enable XSAVES/XRSTORS',
+ 22: 'Mode-based execute control (XS/XU)',
+ 23: 'Sub-page write permissions',
+ 24: 'GPA translation for PT',
+ 25: 'TSC scaling',
+ 26: 'User wait and pause',
+ 28: 'ENCLV exiting',
+ },
+ cap_msr = MSR_IA32_VMX_PROCBASED_CTLS2,
+ ),
+
+ Control(
+ name = 'VM-Exit controls',
+ bits = {
+ 2: 'Save debug controls',
+ 9: 'Host address-space size',
+ 12: 'Load IA32_PERF_GLOBAL_CTRL',
+ 15: 'Acknowledge interrupt on exit',
+ 18: 'Save IA32_PAT',
+ 19: 'Load IA32_PAT',
+ 20: 'Save IA32_EFER',
+ 21: 'Load IA32_EFER',
+ 22: 'Save VMX-preemption timer value',
+ 23: 'Clear IA32_BNDCFGS',
+ 24: 'Conceal VM exits from PT',
+ 25: 'Clear IA32_RTIT_CTL',
+ },
+ cap_msr = MSR_IA32_VMX_EXIT_CTLS,
+ true_cap_msr = MSR_IA32_VMX_TRUE_EXIT_CTLS,
+ ),
+
+ Control(
+ name = 'VM-Entry controls',
+ bits = {
+ 2: 'Load debug controls',
+ 9: 'IA-32e mode guest',
+ 10: 'Entry to SMM',
+ 11: 'Deactivate dual-monitor treatment',
+ 13: 'Load IA32_PERF_GLOBAL_CTRL',
+ 14: 'Load IA32_PAT',
+ 15: 'Load IA32_EFER',
+ 16: 'Load IA32_BNDCFGS',
+ 17: 'Conceal VM entries from PT',
+ 18: 'Load IA32_RTIT_CTL',
+ },
+ cap_msr = MSR_IA32_VMX_ENTRY_CTLS,
+ true_cap_msr = MSR_IA32_VMX_TRUE_ENTRY_CTLS,
+ ),
+
+ Misc(
+ name = 'Miscellaneous data',
+ bits = {
+ (0,4): 'VMX-preemption timer scale (log2)',
+ 5: 'Store EFER.LMA into IA-32e mode guest control',
+ 6: 'HLT activity state',
+ 7: 'Shutdown activity state',
+ 8: 'Wait-for-SIPI activity state',
+ 14: 'PT in VMX operation',
+ 15: 'IA32_SMBASE support',
+ (16,24): 'Number of CR3-target values',
+ (25,27): 'MSR-load/store count recommendation',
+ 28: 'IA32_SMM_MONITOR_CTL[2] can be set to 1',
+ 29: 'VMWRITE to VM-exit information fields',
+ 30: 'Inject event with insn length=0',
+ (32,63): 'MSEG revision identifier',
+ },
+ msr = MSR_IA32_VMX_MISC_CTLS,
+ ),
+
+ Misc(
+ name = 'VPID and EPT capabilities',
+ bits = {
+ 0: 'Execute-only EPT translations',
+ 6: 'Page-walk length 4',
+ 8: 'Paging-structure memory type UC',
+ 14: 'Paging-structure memory type WB',
+ 16: '2MB EPT pages',
+ 17: '1GB EPT pages',
+ 20: 'INVEPT supported',
+ 21: 'EPT accessed and dirty flags',
+ 22: 'Advanced VM-exit information for EPT violations',
+ 25: 'Single-context INVEPT',
+ 26: 'All-context INVEPT',
+ 32: 'INVVPID supported',
+ 40: 'Individual-address INVVPID',
+ 41: 'Single-context INVVPID',
+ 42: 'All-context INVVPID',
+ 43: 'Single-context-retaining-globals INVVPID',
+ },
+ msr = MSR_IA32_VMX_EPT_VPID_CAP,
+ ),
+ Misc(
+ name = 'VM Functions',
+ bits = {
+ 0: 'EPTP Switching',
+ },
+ msr = MSR_IA32_VMX_VMFUNC,
+ ),
+ ]
+
+if __name__ == '__main__':
+ for c in controls:
+ c.show()
--
cgit