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[Qemu-devel] [PATCH v6 4/4] trace: Add 'vcpu' event property to trace gu
|
From: |
Lluís Vilanova |
|
Subject: |
[Qemu-devel] [PATCH v6 4/4] trace: Add 'vcpu' event property to trace guest vCPU |
|
Date: |
Tue, 9 Feb 2016 22:14:46 +0100 |
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User-agent: |
StGit/0.17.1-dirty |
This property identifies events that trace vCPU-specific information.
It adds a "CPUState*" argument to events with the property, identifying
the vCPU raising the event. TCG translation events also have a
"TCGv_cpu" implicit argument that is later used as the "CPUState*"
argument at execution time.
Signed-off-by: Lluís Vilanova <address@hidden>
---
docs/tracing.txt | 41 +++++++++++++
include/qemu/typedefs.h | 1
scripts/tracetool/__init__.py | 11 +++-
scripts/tracetool/format/h.py | 3 +
scripts/tracetool/format/tcg_h.py | 31 +++++++---
scripts/tracetool/format/tcg_helper_c.py | 35 +++++++++--
scripts/tracetool/format/tcg_helper_h.py | 7 +-
scripts/tracetool/format/tcg_helper_wrapper_h.py | 5 +-
scripts/tracetool/format/ust_events_c.py | 1
scripts/tracetool/transform.py | 4 +
scripts/tracetool/vcpu.py | 69 ++++++++++++++++++++++
trace/control.h | 3 +
12 files changed, 184 insertions(+), 27 deletions(-)
create mode 100644 scripts/tracetool/vcpu.py
diff --git a/docs/tracing.txt b/docs/tracing.txt
index 3853a6a..f5b39e7 100644
--- a/docs/tracing.txt
+++ b/docs/tracing.txt
@@ -347,3 +347,44 @@ This will immediately call:
and will generate the TCG code to call:
void trace_foo(uint8_t a1, uint32_t a2);
+
+=== "vcpu" ===
+
+Identifies events that trace vCPU-specific information. It implicitly adds a
+"CPUState*" argument, and extends the tracing print format to show the vCPU
+information. If used together with the "tcg" property, it adds a second
+"TCGv_cpu" argument that must point to the per-target global TCG register that
+points to the vCPU when guest code is executed (usually the "cpu_env"
variable).
+
+The following example events:
+
+ foo(uint32_t a) "a=%x"
+ vcpu bar(uint32_t a) "a=%x"
+ tcg vcpu baz(uint32_t a) "a=%x", "a=%x"
+
+Can be used as:
+
+ #include "trace-tcg.h"
+
+ CPUArchState *env;
+ TCGv_ptr cpu_env;
+
+ void some_disassembly_func(...)
+ {
+ /* trace emitted at this point */
+ trace_foo(0xd1);
+ /* trace emitted at this point */
+ trace_bar(ENV_GET_CPU(env), 0xd2);
+ /* trace emitted at this point (env) and when guest code is executed
(cpu_env) */
+ trace_baz_tcg(ENV_GET_CPU(env), cpu_env, 0xd3);
+ }
+
+If the translating vCPU has address 0xc1 and code is later executed by vCPU
+0xc2, this would be an example output:
+
+ // at guest code translation
+ foo a=0xd1
+ bar cpu=0xc1 a=0xd2
+ baz_trans cpu=0xc1 a=0xd3
+ // at guest code execution
+ baz_exec cpu=0xc2 a=0xd3
diff --git a/include/qemu/typedefs.h b/include/qemu/typedefs.h
index 6ed91b4..9a5ead6 100644
--- a/include/qemu/typedefs.h
+++ b/include/qemu/typedefs.h
@@ -18,6 +18,7 @@ typedef struct BusState BusState;
typedef struct CharDriverState CharDriverState;
typedef struct CompatProperty CompatProperty;
typedef struct CPUAddressSpace CPUAddressSpace;
+typedef struct CPUState CPUState;
typedef struct DeviceListener DeviceListener;
typedef struct DeviceState DeviceState;
typedef struct DisplayChangeListener DisplayChangeListener;
diff --git a/scripts/tracetool/__init__.py b/scripts/tracetool/__init__.py
index 1bf9246..bef9b49 100644
--- a/scripts/tracetool/__init__.py
+++ b/scripts/tracetool/__init__.py
@@ -157,7 +157,7 @@ class Event(object):
"(?:(?:(?P<fmt_trans>\".+),)?\s*(?P<fmt>\".+))?"
"\s*")
- _VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec"])
+ _VALID_PROPS = set(["disable", "tcg", "tcg-trans", "tcg-exec", "vcpu"])
def __init__(self, name, props, fmt, args, orig=None):
"""
@@ -226,7 +226,13 @@ class Event(object):
if "tcg" in props and isinstance(fmt, str):
raise ValueError("Events with 'tcg' property must have two
formats")
- return Event(name, props, fmt, args)
+ event = Event(name, props, fmt, args)
+
+ # add implicit arguments when using the 'vcpu' property
+ import tracetool.vcpu
+ event = tracetool.vcpu.transform_event(event)
+
+ return event
def __repr__(self):
"""Evaluable string representation for this object."""
@@ -281,6 +287,7 @@ def _read_events(fobj):
event_trans.name += "_trans"
event_trans.properties += ["tcg-trans"]
event_trans.fmt = event.fmt[0]
+ # ignore TCG arguments
args_trans = []
for atrans, aorig in zip(
event_trans.transform(tracetool.transform.TCG_2_HOST).args,
diff --git a/scripts/tracetool/format/h.py b/scripts/tracetool/format/h.py
index 9b39430..2bd68a2 100644
--- a/scripts/tracetool/format/h.py
+++ b/scripts/tracetool/format/h.py
@@ -6,7 +6,7 @@ trace/generated-tracers.h
"""
__author__ = "Lluís Vilanova <address@hidden>"
-__copyright__ = "Copyright 2012-2014, Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2012-2016, Lluís Vilanova <address@hidden>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -23,6 +23,7 @@ def generate(events, backend):
'#define TRACE__GENERATED_TRACERS_H',
'',
'#include "qemu-common.h"',
+ '#include "qemu/typedefs.h"',
'')
backend.generate_begin(events)
diff --git a/scripts/tracetool/format/tcg_h.py
b/scripts/tracetool/format/tcg_h.py
index 0d2cf79..e24eb09 100644
--- a/scripts/tracetool/format/tcg_h.py
+++ b/scripts/tracetool/format/tcg_h.py
@@ -13,7 +13,18 @@ __maintainer__ = "Stefan Hajnoczi"
__email__ = "address@hidden"
-from tracetool import out
+from tracetool import out, Arguments
+import tracetool.vcpu
+
+
+def vcpu_transform_args(args):
+ assert len(args) == 1
+ return Arguments([
+ args,
+ # NOTE: this name must be kept in sync with the one in "tcg_h"
+ # NOTE: Current helper code uses TCGv_env (CPUArchState*)
+ ("TCGv_env", "__tcg_" + args.names()[0]),
+ ])
def generate(events, backend):
@@ -35,21 +46,21 @@ def generate(events, backend):
if "tcg-trans" not in e.properties:
continue
- # get the original event definition
- e = e.original
-
out('static inline void %(name_tcg)s(%(args)s)',
'{',
- name_tcg=e.api(e.QEMU_TRACE_TCG),
- args=e.args)
+ name_tcg=e.original.api(e.QEMU_TRACE_TCG),
+ args=tracetool.vcpu.transform_args("tcg_h", e))
if "disable" not in e.properties:
+ args_trans = e.original.event_exec.args
+ args_exec = tracetool.vcpu.transform_args(
+ "tcg_helper_c", e.original.event_exec, "wrapper")
out(' %(name_trans)s(%(argnames_trans)s);',
' gen_helper_%(name_exec)s(%(argnames_exec)s);',
- name_trans=e.event_trans.api(e.QEMU_TRACE),
- name_exec=e.event_exec.api(e.QEMU_TRACE),
- argnames_trans=", ".join(e.event_trans.args.names()),
- argnames_exec=", ".join(e.event_exec.args.names()))
+ name_trans=e.original.event_trans.api(e.QEMU_TRACE),
+ name_exec=e.original.event_exec.api(e.QEMU_TRACE),
+ argnames_trans=", ".join(args_trans.names()),
+ argnames_exec=", ".join(args_exec.names()))
out('}')
diff --git a/scripts/tracetool/format/tcg_helper_c.py
b/scripts/tracetool/format/tcg_helper_c.py
index 96655a0..62ddb51 100644
--- a/scripts/tracetool/format/tcg_helper_c.py
+++ b/scripts/tracetool/format/tcg_helper_c.py
@@ -6,15 +6,38 @@ Generate trace/generated-helpers.c.
"""
__author__ = "Lluís Vilanova <address@hidden>"
-__copyright__ = "Copyright 2012-2014, Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2012-2016, Lluís Vilanova <address@hidden>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
__email__ = "address@hidden"
-from tracetool import out
+from tracetool import Arguments, out
from tracetool.transform import *
+import tracetool.vcpu
+
+
+def vcpu_transform_args(args, mode):
+ assert len(args) == 1
+ # NOTE: this name must be kept in sync with the one in "tcg_h"
+ args = Arguments([(args.types()[0], "__tcg_" + args.names()[0])])
+ if mode == "code":
+ return Arguments([
+ # Does cast from helper requirements to tracing types
+ ("CPUState *", "ENV_GET_CPU(%s)" % args.names()[0]),
+ ])
+ else:
+ args = Arguments([
+ # NOTE: Current helper code uses TCGv_env (CPUArchState*)
+ ("CPUArchState *", args.names()[0]),
+ ])
+ if mode == "header":
+ return args
+ elif mode == "wrapper":
+ return args.transform(HOST_2_TCG)
+ else:
+ assert False
def generate(events, backend):
@@ -33,11 +56,11 @@ def generate(events, backend):
if "tcg-exec" not in e.properties:
continue
- # tracetool.generate always transforms types to host
- e_args = e.original.args
+ e_args_api = tracetool.vcpu.transform_args("tcg_helper_c", e, "header")
+ e_args_code = tracetool.vcpu.transform_args("tcg_helper_c", e, "code")
values = ["(%s)%s" % (t, n)
- for t, n in e.args.transform(TCG_2_TCG_HELPER_DEF)]
+ for t, n in e_args_code.transform(TCG_2_TCG_HELPER_DEF)]
out('void %(name_tcg)s(%(args)s)',
'{',
@@ -45,6 +68,6 @@ def generate(events, backend):
'}',
name_tcg="helper_%s_proxy" % e.api(),
name=e.api(),
- args=e_args.transform(HOST_2_TCG_COMPAT, TCG_2_TCG_HELPER_DEF),
+ args=e_args_api.transform(HOST_2_TCG_COMPAT, TCG_2_TCG_HELPER_DEF),
values=", ".join(values),
)
diff --git a/scripts/tracetool/format/tcg_helper_h.py
b/scripts/tracetool/format/tcg_helper_h.py
index a8ba7ba..07dfcc1 100644
--- a/scripts/tracetool/format/tcg_helper_h.py
+++ b/scripts/tracetool/format/tcg_helper_h.py
@@ -6,7 +6,7 @@ Generate trace/generated-helpers.h.
"""
__author__ = "Lluís Vilanova <address@hidden>"
-__copyright__ = "Copyright 2012-2014, Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2012-2016, Lluís Vilanova <address@hidden>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -15,6 +15,7 @@ __email__ = "address@hidden"
from tracetool import out
from tracetool.transform import *
+import tracetool.vcpu
def generate(events, backend):
@@ -29,11 +30,9 @@ def generate(events, backend):
if "tcg-exec" not in e.properties:
continue
- # tracetool.generate always transforms types to host
- e_args = e.original.args
-
# TCG helper proxy declaration
fmt = "DEF_HELPER_FLAGS_%(argc)d(%(name)s, %(flags)svoid%(types)s)"
+ e_args = tracetool.vcpu.transform_args("tcg_helper_c", e, "header")
args = e_args.transform(HOST_2_TCG_COMPAT, HOST_2_TCG,
TCG_2_TCG_HELPER_DECL)
types = ", ".join(args.types())
diff --git a/scripts/tracetool/format/tcg_helper_wrapper_h.py
b/scripts/tracetool/format/tcg_helper_wrapper_h.py
index cac5a87..494dd63 100644
--- a/scripts/tracetool/format/tcg_helper_wrapper_h.py
+++ b/scripts/tracetool/format/tcg_helper_wrapper_h.py
@@ -6,7 +6,7 @@ Generate trace/generated-helpers-wrappers.h.
"""
__author__ = "Lluís Vilanova <address@hidden>"
-__copyright__ = "Copyright 2012-2014, Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2012-2016, Lluís Vilanova <address@hidden>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -15,6 +15,7 @@ __email__ = "address@hidden"
from tracetool import out
from tracetool.transform import *
+import tracetool.vcpu
def generate(events, backend):
@@ -33,7 +34,7 @@ def generate(events, backend):
continue
# tracetool.generate always transforms types to host
- e_args = e.original.args
+ e_args = tracetool.vcpu.transform_args("tcg_helper_c", e, "wrapper")
# mixed-type to TCG helper bridge
args_tcg_compat = e_args.transform(HOST_2_TCG_COMPAT)
diff --git a/scripts/tracetool/format/ust_events_c.py
b/scripts/tracetool/format/ust_events_c.py
index bc97093..ecb1f23 100644
--- a/scripts/tracetool/format/ust_events_c.py
+++ b/scripts/tracetool/format/ust_events_c.py
@@ -30,4 +30,5 @@ def generate(events, backend):
' */',
'#pragma GCC diagnostic ignored "-Wredundant-decls"',
'',
+ '#include "qemu/typedefs.h"',
'#include "generated-ust-provider.h"')
diff --git a/scripts/tracetool/transform.py b/scripts/tracetool/transform.py
index fc5e679..e18b053 100644
--- a/scripts/tracetool/transform.py
+++ b/scripts/tracetool/transform.py
@@ -6,7 +6,7 @@ Type-transformation rules.
"""
__author__ = "Lluís Vilanova <address@hidden>"
-__copyright__ = "Copyright 2012-2014, Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2012-2016, Lluís Vilanova <address@hidden>"
__license__ = "GPL version 2 or (at your option) any later version"
__maintainer__ = "Stefan Hajnoczi"
@@ -98,6 +98,7 @@ HOST_2_TCG = {
"uint32_t": "TCGv_i32",
"uint64_t": "TCGv_i64",
"void *" : "TCGv_ptr",
+ "CPUArchState *": "TCGv_env",
None: _host_2_tcg,
}
@@ -130,6 +131,7 @@ TCG_2_TCG_HELPER_DECL = {
"TCGv_ptr": "ptr",
"TCGv_i32": "i32",
"TCGv_i64": "i64",
+ "TCGv_env": "env",
None: _tcg_2_tcg_helper_decl_error,
}
diff --git a/scripts/tracetool/vcpu.py b/scripts/tracetool/vcpu.py
new file mode 100644
index 0000000..6a7d352
--- /dev/null
+++ b/scripts/tracetool/vcpu.py
@@ -0,0 +1,69 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+"""
+Generic management for the 'vcpu' property.
+
+"""
+
+__author__ = "Lluís Vilanova <address@hidden>"
+__copyright__ = "Copyright 2016, Lluís Vilanova <address@hidden>"
+__license__ = "GPL version 2 or (at your option) any later version"
+
+__maintainer__ = "Stefan Hajnoczi"
+__email__ = "address@hidden"
+
+
+from tracetool import Arguments, try_import
+
+
+def transform_event(event):
+ """Transform event to comply with the 'vcpu' property (if present)."""
+ if "vcpu" in event.properties:
+ # events with 'tcg-trans' and 'tcg-exec' are auto-generated from
+ # already-patched events
+ assert "tcg-trans" not in event.properties
+ assert "tcg-exec" not in event.properties
+
+ event.args = Arguments([("CPUState *", "__cpu"), event.args])
+ if "tcg" in event.properties:
+ fmt = "\"cpu=%p \""
+ event.fmt = [fmt + event.fmt[0],
+ fmt + event.fmt[0]]
+ else:
+ event.fmt = fmt + event.fmt
+ return event
+
+
+def transform_args(format, event, *args, **kwargs):
+ """Transforms the arguments to suit the specified format.
+
+ The format module must implement function 'vcpu_args', which receives the
+ implicit arguments added by the 'vcpu' property, and must return suitable
+ arguments for the given format.
+
+ The function is only called for events with the 'vcpu' property.
+
+ Parameters
+ ==========
+ format : str
+ Format module name.
+ event : Event
+ args, kwargs
+ Passed to 'vcpu_transform_args'.
+
+ Returns
+ =======
+ Arguments
+ The transformed arguments, including the non-implicit ones.
+
+ """
+ if "vcpu" in event.properties:
+ ok, func = try_import("tracetool.format." + format,
+ "vcpu_transform_args")
+ assert ok
+ assert func
+ return Arguments([func(event.args[:1], *args, **kwargs),
+ event.args[1:]])
+ else:
+ return event.args
diff --git a/trace/control.h b/trace/control.h
index d5bc86e..f0fe535 100644
--- a/trace/control.h
+++ b/trace/control.h
@@ -1,7 +1,7 @@
/*
* Interface for configuring and controlling the state of tracing events.
*
- * Copyright (C) 2011-2014 Lluís Vilanova <address@hidden>
+ * Copyright (C) 2011-2016 Lluís Vilanova <address@hidden>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
@@ -11,6 +11,7 @@
#define TRACE__CONTROL_H
#include "qemu-common.h"
+#include "qemu/typedefs.h"
#include "trace/generated-events.h"