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That's all we know. X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: robert.foley@linaro.org, cota@braap.org, peter.puhov@linaro.org, pbonzini@redhat.com, alex.bennee@linaro.org, Richard Henderson Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" This is part of a series of changes to remove the implied BQL from the common code of cpu_handle_interrupt and cpu_handle_exception. As part of removing the implied BQL from the common code, we are pushing the BQL holding down into the per-arch implementation functions of do_interrupt and cpu_exec_interrupt. The purpose of this set of changes is to set the groundwork so that an arch could move towards removing the BQL from the cpu_handle_interrupt/exception paths. This approach was suggested by Paolo Bonzini. For reference, here are two key posts in the discussion, explaining the reasoning/benefits of this approach. https://lists.gnu.org/archive/html/qemu-devel/2020-07/msg08731.html https://lists.gnu.org/archive/html/qemu-devel/2020-08/msg00044.html Signed-off-by: Robert Foley --- target/alpha/helper.c | 15 +++++++++++++-- 1 file changed, 13 insertions(+), 2 deletions(-) diff --git a/target/alpha/helper.c b/target/alpha/helper.c index 55d7274d94..18169ae1c5 100644 --- a/target/alpha/helper.c +++ b/target/alpha/helper.c @@ -299,8 +299,12 @@ void alpha_cpu_do_interrupt(CPUState *cs) { AlphaCPU *cpu =3D ALPHA_CPU(cs); CPUAlphaState *env =3D &cpu->env; - int i =3D cs->exception_index; - + int i; + bool bql =3D !qemu_mutex_iothread_locked(); + if (bql) { + qemu_mutex_lock_iothread(); + } + i =3D cs->exception_index; if (qemu_loglevel_mask(CPU_LOG_INT)) { static int count; const char *name =3D ""; @@ -405,6 +409,9 @@ void alpha_cpu_do_interrupt(CPUState *cs) /* Switch to PALmode. */ env->flags |=3D ENV_FLAG_PAL_MODE; #endif /* !USER_ONLY */ + if (bql) { + qemu_mutex_unlock_iothread(); + } } =20 bool alpha_cpu_exec_interrupt(CPUState *cs, int interrupt_request) @@ -412,9 +419,11 @@ bool alpha_cpu_exec_interrupt(CPUState *cs, int interr= upt_request) AlphaCPU *cpu =3D ALPHA_CPU(cs); CPUAlphaState *env =3D &cpu->env; int idx =3D -1; + qemu_mutex_lock_iothread(); =20 /* We never take interrupts while in PALmode. */ if (env->flags & ENV_FLAG_PAL_MODE) { + qemu_mutex_unlock_iothread(); return false; } =20 @@ -446,8 +455,10 @@ bool alpha_cpu_exec_interrupt(CPUState *cs, int interr= upt_request) cs->exception_index =3D idx; env->error_code =3D 0; alpha_cpu_do_interrupt(cs); + qemu_mutex_unlock_iothread(); return true; } + qemu_mutex_unlock_iothread(); return false; } =20 --=20 2.17.1