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envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.451, 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_PASS=-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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Magnus Kulke Implement signal handling for MSHV vCPUs to support asynchronous interrupts from the main thread. Signed-off-by: Magnus Kulke Link: https://lore.kernel.org/r/20250916164847.77883-12-magnuskulke@linux.microsoft.com Signed-off-by: Paolo Bonzini --- accel/mshv/mshv-all.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/accel/mshv/mshv-all.c b/accel/mshv/mshv-all.c index e02421d79d4..fa1f8f35bdb 100644 --- a/accel/mshv/mshv-all.c +++ b/accel/mshv/mshv-all.c @@ -524,6 +524,35 @@ static int mshv_cpu_exec(CPUState *cpu) return ret; } +/* + * The signal handler is triggered when QEMU's main thread receives a SIG_IPI + * (SIGUSR1). This signal causes the current CPU thread to be kicked, forcing a + * VM exit on the CPU. The VM exit generates an exit reason that breaks the loop + * (see mshv_cpu_exec). If the exit is due to a Ctrl+A+x command, the system + * will shut down. For other cases, the system will continue running. + */ +static void sa_ipi_handler(int sig) +{ + /* TODO: call IOCTL to set_immediate_exit, once implemented. */ + + qemu_cpu_kick_self(); +} + +static void init_signal(CPUState *cpu) +{ + /* init cpu signals */ + struct sigaction sigact; + sigset_t set; + + memset(&sigact, 0, sizeof(sigact)); + sigact.sa_handler = sa_ipi_handler; + sigaction(SIG_IPI, &sigact, NULL); + + pthread_sigmask(SIG_BLOCK, NULL, &set); + sigdelset(&set, SIG_IPI); + pthread_sigmask(SIG_SETMASK, &set, NULL); +} + static void *mshv_vcpu_thread(void *arg) { CPUState *cpu = arg; @@ -540,6 +569,7 @@ static void *mshv_vcpu_thread(void *arg) error_report("Failed to init vcpu %d", cpu->cpu_index); goto cleanup; } + init_signal(cpu); /* signal CPU creation */ cpu_thread_signal_created(cpu); -- 2.51.0