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[PATCH v1 21/28] docs: remove references to TCG tracing
From: |
Alex Bennée |
Subject: |
[PATCH v1 21/28] docs: remove references to TCG tracing |
Date: |
Tue, 26 Oct 2021 11:22:27 +0100 |
Users wanting this sort of functionality should turn to TCG plugins
instead.
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Luis Vilanova <vilanova@imperial.ac.uk>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
---
docs/about/removed-features.rst | 13 +++++
docs/devel/tracing.rst | 85 ---------------------------------
2 files changed, 13 insertions(+), 85 deletions(-)
diff --git a/docs/about/removed-features.rst b/docs/about/removed-features.rst
index 9d0d90c90d..641aa22112 100644
--- a/docs/about/removed-features.rst
+++ b/docs/about/removed-features.rst
@@ -594,6 +594,19 @@ the upstream Linux kernel in 2018, and it has also been
dropped from glibc, so
there is no new Linux development taking place with this architecture. For
running the old binaries, you can use older versions of QEMU.
+TCG introspection features
+--------------------------
+
+TCG trace-events (since 6.2)
+''''''''''''''''''''''''''''
+
+The ability to add new TCG trace points had bit rotted and as the
+feature can be replicated with TCG plugins it was removed. If
+any user is currently using this feature and needs help with
+converting to using TCG plugins they should contact the qemu-devel
+mailing list.
+
+
System emulator devices
-----------------------
diff --git a/docs/devel/tracing.rst b/docs/devel/tracing.rst
index ba83954899..ef67bc9d70 100644
--- a/docs/devel/tracing.rst
+++ b/docs/devel/tracing.rst
@@ -411,88 +411,3 @@ disabled, this check will have no performance impact.
return ptr;
}
-"tcg"
------
-
-Guest code generated by TCG can be traced by defining an event with the "tcg"
-event property. Internally, this property generates two events:
-"<eventname>_trans" to trace the event at translation time, and
-"<eventname>_exec" to trace the event at execution time.
-
-Instead of using these two events, you should instead use the function
-"trace_<eventname>_tcg" during translation (TCG code generation). This function
-will automatically call "trace_<eventname>_trans", and will generate the
-necessary TCG code to call "trace_<eventname>_exec" during guest code
execution.
-
-Events with the "tcg" property can be declared in the "trace-events" file with
a
-mix of native and TCG types, and "trace_<eventname>_tcg" will gracefully
forward
-them to the "<eventname>_trans" and "<eventname>_exec" events. Since TCG values
-are not known at translation time, these are ignored by the "<eventname>_trans"
-event. Because of this, the entry in the "trace-events" file needs two printing
-formats (separated by a comma)::
-
- tcg foo(uint8_t a1, TCGv_i32 a2) "a1=%d", "a1=%d a2=%d"
-
-For example::
-
- #include "trace-tcg.h"
-
- void some_disassembly_func (...)
- {
- uint8_t a1 = ...;
- TCGv_i32 a2 = ...;
- trace_foo_tcg(a1, a2);
- }
-
-This will immediately call::
-
- void trace_foo_trans(uint8_t a1);
-
-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_env" 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 "tcg" and "vcpu" properties are currently only honored in the root
-./trace-events file.
-
-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_cpu(env), 0xd2);
- /* trace emitted at this point (env) and when guest code is executed
(cpu_env) */
- trace_baz_tcg(env_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
--
2.30.2
- [PATCH v1 23/28] tracing: remove the trace-tcg includes from the build, (continued)
- [PATCH v1 23/28] tracing: remove the trace-tcg includes from the build, Alex Bennée, 2021/10/26
- [PATCH v1 24/28] tracing: excise the tcg related from tracetool, Alex Bennée, 2021/10/26
- [PATCH v1 14/28] plugins/cache: implement unified L2 cache emulation, Alex Bennée, 2021/10/26
- [PATCH v1 22/28] tracing: remove TCG memory access tracing, Alex Bennée, 2021/10/26
- [PATCH v1 27/28] tests/tcg: remove duplicate EXTRA_RUNS, Alex Bennée, 2021/10/26
- [PATCH v1 16/28] plugins/cache: make L2 emulation optional through args, Alex Bennée, 2021/10/26
- [PATCH v1 20/28] plugins: try and make plugin_insn_append more ergonomic, Alex Bennée, 2021/10/26
- [PATCH v1 21/28] docs: remove references to TCG tracing,
Alex Bennée <=