jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
scripts/qemu-gdb: add simple tcg lock status helper
Add a simple helper to dump lock state.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
authored by
Alex Bennée
and committed by
Paolo Bonzini
f1cd52d8
809092f3
+48
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-1
scripts/qemu-gdb.py
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scripts/qemu-gdb.py
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sys.path.append(os.path.dirname(__file__))
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from qemugdb import aio, mtree, coroutine
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from qemugdb import aio, mtree, coroutine, tcg
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class QemuCommand(gdb.Command):
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'''Prefix for QEMU debug support commands'''
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coroutine.CoroutineCommand()
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mtree.MtreeCommand()
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aio.HandlersCommand()
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tcg.TCGLockStatusCommand()
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coroutine.CoroutineSPFunction()
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coroutine.CoroutinePCFunction()
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scripts/qemugdb/tcg.py
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scripts/qemugdb/tcg.py
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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#
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# GDB debugging support, TCG status
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#
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# Copyright 2016 Linaro Ltd
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#
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# Authors:
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# Alex Bennée <alex.bennee@linaro.org>
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#
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# This work is licensed under the terms of the GNU GPL, version 2. See
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# the COPYING file in the top-level directory.
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#
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# Contributions after 2012-01-13 are licensed under the terms of the
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# GNU GPL, version 2 or (at your option) any later version.
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# 'qemu tcg-lock-status' -- display the TCG lock status across threads
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import gdb
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class TCGLockStatusCommand(gdb.Command):
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'''Display TCG Execution Status'''
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def __init__(self):
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gdb.Command.__init__(self, 'qemu tcg-lock-status', gdb.COMMAND_DATA,
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gdb.COMPLETE_NONE)
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def invoke(self, arg, from_tty):
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gdb.write("Thread, BQL (iothread_mutex), Replay, Blocked?\n")
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for thread in gdb.inferiors()[0].threads():
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thread.switch()
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iothread = gdb.parse_and_eval("iothread_locked")
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replay = gdb.parse_and_eval("replay_locked")
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frame = gdb.selected_frame()
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if frame.name() == "__lll_lock_wait":
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frame.older().select()
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mutex = gdb.parse_and_eval("mutex")
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owner = gdb.parse_and_eval("mutex->__data.__owner")
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blocked = ("__lll_lock_wait waiting on %s from %d" %
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(mutex, owner))
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else:
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blocked = "not blocked"
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gdb.write("%d/%d, %s, %s, %s\n" % (thread.num, thread.ptid[1],
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iothread, replay, blocked))