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charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Host-Lookup-Failed: Reverse DNS lookup failed for 2a00:1450:4864:20::62c (failed) Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::62c; envelope-from=alex.bennee@linaro.org; helo=mail-ej1-x62c.google.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, PDS_HP_HELO_NORDNS=0.001, RCVD_IN_DNSWL_NONE=-0.0001, RDNS_NONE=0.793, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: fam@euphon.net, berrange@redhat.com, stefanha@redhat.com, crosa@redhat.com, Richard Henderson , aaron@os.amperecomputing.com, robhenry@microsoft.com, f4bug@amsat.org, Luis Vilanova , mahmoudabdalghany@outlook.com, minyihh@uci.edu, cota@braap.org, Luke.Craig@ll.mit.edu, pbonzini@redhat.com, kuhn.chenqun@huawei.com, ma.mandourr@gmail.com, =?UTF-8?q?Alex=20Benn=C3=A9e?= , aurelien@aurel32.net Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1643752950677100001 Users wanting this sort of functionality should turn to TCG plugins instead. Signed-off-by: Alex Benn=C3=A9e Reviewed-by: Richard Henderson Cc: Luis Vilanova Cc: Stefan Hajnoczi Message-Id: <20220124201608.604599-14-alex.bennee@linaro.org> --- 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 4c4da20d0f..b0156e0f25 100644 --- a/docs/about/removed-features.rst +++ b/docs/about/removed-features.rst @@ -601,6 +601,19 @@ the upstream Linux kernel in 2018, and it has also bee= n 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. =20 +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 ----------------------- =20 diff --git a/docs/devel/tracing.rst b/docs/devel/tracing.rst index 4290ac42ee..ec9a687cfd 100644 --- a/docs/devel/tracing.rst +++ b/docs/devel/tracing.rst @@ -413,88 +413,3 @@ disabled, this check will have no performance impact. return ptr; } =20 -"tcg" ------ - -Guest code generated by TCG can be traced by defining an event with the "t= cg" -event property. Internally, this property generates two events: -"_trans" to trace the event at translation time, and -"_exec" to trace the event at execution time. - -Instead of using these two events, you should instead use the function -"trace__tcg" during translation (TCG code generation). This fun= ction -will automatically call "trace__trans", and will generate the -necessary TCG code to call "trace__exec" during guest code exec= ution. - -Events with the "tcg" property can be declared in the "trace-events" file = with a -mix of native and TCG types, and "trace__tcg" will gracefully f= orward -them to the "_trans" and "_exec" events. Since TCG v= alues -are not known at translation time, these are ignored by the "_t= rans" -event. Because of this, the entry in the "trace-events" file needs two pri= nting -formats (separated by a comma):: - - tcg foo(uint8_t a1, TCGv_i32 a2) "a1=3D%d", "a1=3D%d a2=3D%d" - -For example:: - - #include "trace-tcg.h" - =20 - void some_disassembly_func (...) - { - uint8_t a1 =3D ...; - TCGv_i32 a2 =3D ...; - 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" vari= able). - -The "tcg" and "vcpu" properties are currently only honored in the root -./trace-events file. - -The following example events:: - - foo(uint32_t a) "a=3D%x" - vcpu bar(uint32_t a) "a=3D%x" - tcg vcpu baz(uint32_t a) "a=3D%x", "a=3D%x" - -Can be used as:: - - #include "trace-tcg.h" - =20 - CPUArchState *env; - TCGv_ptr cpu_env; - =20 - 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 execut= ed (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=3D0xd1 - bar cpu=3D0xc1 a=3D0xd2 - baz_trans cpu=3D0xc1 a=3D0xd3 - // at guest code execution - baz_exec cpu=3D0xc2 a=3D0xd3 --=20 2.30.2