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Mon, 03 Feb 2025 06:40:58 -0800 (PST) Received: from draig.lan ([185.126.160.109]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-ab6e47a7b0fsm769101066b.12.2025.02.03.06.40.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 03 Feb 2025 06:40:57 -0800 (PST) Received: from draig.lan (localhost [IPv6:::1]) by draig.lan (Postfix) with ESMTP id 03C70609FC; Mon, 3 Feb 2025 14:40:50 +0000 (GMT) From: =?utf-8?q?Alex_Benn=C3=A9e?= To: qemu-devel@nongnu.org Cc: qemu-ppc@nongnu.org, Mahmoud Mandour , Thomas Huth , Daniel Henrique Barboza , Alistair Francis , =?utf-8?q?Alex_Benn=C3=A9e?= , Hao Wu , Peter Xu , Warner Losh , Pierrick Bouvier , qemu-arm@nongnu.org, Harsh Prateek Bora , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , Palmer Dabbelt , Kyle Evans , Laurent Vivier , Riku Voipio , Bin Meng , qemu-rust@nongnu.org, Laurent Vivier , Liu Zhiwei , Weiwei Li , qemu-riscv@nongnu.org, Fabiano Rosas , Tyrone Ting , Paolo Bonzini , Nicholas Piggin , Alexandre Iooss , Ilya Leoshkevich Subject: [PATCH 13/18] user: Introduce host_interrupt_signal Date: Mon, 3 Feb 2025 14:40:43 +0000 Message-Id: <20250203144048.2131117-14-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250203144048.2131117-1-alex.bennee@linaro.org> References: <20250203144048.2131117-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::52c; envelope-from=alex.bennee@linaro.org; helo=mail-ed1-x52c.google.com 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: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org From: Ilya Leoshkevich Attaching to the gdbstub of a running process requires stopping its threads. For threads that run on a CPU, cpu_exit() is enough, but the only way to grab attention of a thread that is stuck in a long-running syscall is to interrupt it with a signal. Reserve a host realtime signal for this, just like it's already done for TARGET_SIGABRT on Linux. This may reduce the number of available guest realtime signals by one, but this is acceptable, since there are quite a lot of them, and it's unlikely that there are apps that need them all. Set signal_pending for the safe_sycall machinery to prevent invoking the syscall. This is a lie, since we don't queue a guest signal, but process_pending_signals() can handle the absence of pending signals. The syscall returns with QEMU_ERESTARTSYS errno, which arranges for the automatic restart. This is important, because it helps avoiding disturbing poorly written guests. Reviewed-by: Warner Losh Signed-off-by: Ilya Leoshkevich Message-Id: <20250117001542.8290-5-iii@linux.ibm.com> Signed-off-by: Alex Bennée --- include/user/signal.h | 2 ++ bsd-user/signal.c | 12 ++++++++++++ linux-user/signal.c | 25 ++++++++++++++++++++----- 3 files changed, 34 insertions(+), 5 deletions(-) diff --git a/include/user/signal.h b/include/user/signal.h index 19b6b9e5dd..7fa33b05d9 100644 --- a/include/user/signal.h +++ b/include/user/signal.h @@ -20,4 +20,6 @@ */ int target_to_host_signal(int sig); +extern int host_interrupt_signal; + #endif diff --git a/bsd-user/signal.c b/bsd-user/signal.c index 8c51f6ce65..ff2ccbbf60 100644 --- a/bsd-user/signal.c +++ b/bsd-user/signal.c @@ -51,6 +51,8 @@ static inline int sas_ss_flags(TaskState *ts, unsigned long sp) on_sig_stack(ts, sp) ? SS_ONSTACK : 0; } +int host_interrupt_signal = SIGRTMAX; + /* * The BSD ABIs use the same signal numbers across all the CPU architectures, so * (unlike Linux) these functions are just the identity mapping. This might not @@ -491,6 +493,12 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) uintptr_t pc = 0; bool sync_sig = false; + if (host_sig == host_interrupt_signal) { + ts->signal_pending = 1; + cpu_exit(thread_cpu); + return; + } + /* * Non-spoofed SIGSEGV and SIGBUS are synchronous, and need special * handling wrt signal blocking and unwinding. @@ -854,6 +862,9 @@ void signal_init(void) for (i = 1; i <= TARGET_NSIG; i++) { host_sig = target_to_host_signal(i); + if (host_sig == host_interrupt_signal) { + continue; + } sigaction(host_sig, NULL, &oact); if (oact.sa_sigaction == (void *)SIG_IGN) { sigact_table[i - 1]._sa_handler = TARGET_SIG_IGN; @@ -872,6 +883,7 @@ void signal_init(void) sigaction(host_sig, &act, NULL); } } + sigaction(host_interrupt_signal, &act, NULL); } static void handle_pending_signal(CPUArchState *env, int sig, diff --git a/linux-user/signal.c b/linux-user/signal.c index bffbef235c..81a98c6d02 100644 --- a/linux-user/signal.c +++ b/linux-user/signal.c @@ -517,6 +517,8 @@ static int core_dump_signal(int sig) } } +int host_interrupt_signal; + static void signal_table_init(const char *rtsig_map) { int hsig, tsig, count; @@ -580,10 +582,10 @@ static void signal_table_init(const char *rtsig_map) * Attempts for configure "missing" signals via sigaction will be * silently ignored. * - * Reserve one signal for internal usage (see below). + * Reserve two signals for internal usage (see below). */ - hsig = SIGRTMIN + 1; + hsig = SIGRTMIN + 2; for (tsig = TARGET_SIGRTMIN; hsig <= SIGRTMAX && tsig <= TARGET_NSIG; hsig++, tsig++) { @@ -604,12 +606,17 @@ static void signal_table_init(const char *rtsig_map) host_to_target_signal_table[SIGABRT] = 0; for (hsig = SIGRTMIN; hsig <= SIGRTMAX; hsig++) { if (!host_to_target_signal_table[hsig]) { - host_to_target_signal_table[hsig] = TARGET_SIGABRT; - break; + if (host_interrupt_signal) { + host_to_target_signal_table[hsig] = TARGET_SIGABRT; + break; + } else { + host_interrupt_signal = hsig; + } } } if (hsig > SIGRTMAX) { - fprintf(stderr, "No rt signals left for SIGABRT mapping\n"); + fprintf(stderr, + "No rt signals left for interrupt and SIGABRT mapping\n"); exit(EXIT_FAILURE); } @@ -689,6 +696,8 @@ void signal_init(const char *rtsig_map) } sigact_table[tsig - 1]._sa_handler = thand; } + + sigaction(host_interrupt_signal, &act, NULL); } /* Force a synchronously taken signal. The kernel force_sig() function @@ -1036,6 +1045,12 @@ static void host_signal_handler(int host_sig, siginfo_t *info, void *puc) bool sync_sig = false; void *sigmask; + if (host_sig == host_interrupt_signal) { + ts->signal_pending = 1; + cpu_exit(thread_cpu); + return; + } + /* * Non-spoofed SIGSEGV and SIGBUS are synchronous, and need special * handling wrt signal blocking and unwinding. Non-spoofed SIGILL,