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Thu, 09 Oct 2025 00:51:04 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEAvcuJXjN4OaFnvU0BDpMBtHHOzemqxtXXbrzSy/pAfs0RHqZFHrlS13MzzsnxgNxVybLHlA== X-Received: by 2002:a05:600c:5492:b0:46e:477a:16cc with SMTP id 5b1f17b1804b1-46fa9af84ecmr50381745e9.24.1759996264196; Thu, 09 Oct 2025 00:51:04 -0700 (PDT) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: Magnus Kulke Subject: [PULL 17/35] accel/mshv: Add vCPU signal handling Date: Thu, 9 Oct 2025 09:50:07 +0200 Message-ID: <20251009075026.505715-18-pbonzini@redhat.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251009075026.505715-1-pbonzini@redhat.com> References: <20251009075026.505715-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -24 X-Spam_score: -2.5 X-Spam_bar: -- X-Spam_report: (-2.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.442, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1759996343343116601 Content-Type: text/plain; charset="utf-8" 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.m= icrosoft.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; } =20 +/* + * 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, forc= ing a + * VM exit on the CPU. The VM exit generates an exit reason that breaks th= e loop + * (see mshv_cpu_exec). If the exit is due to a Ctrl+A+x command, the syst= em + * 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 =3D 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 =3D 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); =20 /* signal CPU creation */ cpu_thread_signal_created(cpu); --=20 2.51.0