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[66.27.222.29]) by smtp.gmail.com with ESMTPSA id m10sm6042358pjs.25.2021.01.28.14.42.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 28 Jan 2021 14:42:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=j34etXVQZzqqkkDQF4UCutDcHqFcrqbhKldr7JT3Nmk=; b=mKXxstFiDWv5XglClKNXc3avHws3W7vvEy0pq/qksBqkMgKnqQh4abpDjGT/Q4EnzI kedzqZB0H6eWrsv4OpgHMMwy+XLK2MtrOhoIXJhgI+CLNjIaognILbgDT4uuyKeKCiI2 0kxckyiOGwvuoQC4PNspD4VTFx2IX9cquudXu2+zwkDkJ79qXHDXha+p1dSrYW6WNWm8 Y+0kTLPW9UeULwKyaL4QYLXhnADhhKDoeEUTdL26Eg+p/1hZR3kaBcZ8kD8FvQRYnGv7 s6a+aPAuYQY/FvD7ddXBFIjb07S1uD5U73VJQJqhry0Z16RMahGHQ4zCBaaA2Q6KxOsJ X8vA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=j34etXVQZzqqkkDQF4UCutDcHqFcrqbhKldr7JT3Nmk=; b=ODbZGnpW0OYUlVM20mm/jE+7sE4K58nguwFMHjUppnWn4twCJJgFZ9m7ct7jOBE8G9 h2+/v/MIgI7Fp9F7J78tDjgaaBTXTNOLMmjec0PgyQTbPzZr8pR28R1qLNmIUzgjN6DC 9ejBeJzKvoNGpZaGBJHMrcBAdObGOdwJTuLK9LNfOIutx6B8pb0aAsqv8HqFjknXFh0B IlRuZACLlZyXwj/r0ZyMkLSpo4qogneKyIYlsd7IaD7BYTyOMSGdj3S+xy8rGN4FYrvR Ejo17bS+L4u5LeMeSvVb9hFyq1CJnICVgLSdMXtMarMXhf9r3s66aeAhZFzWGqfcSRWA GvOg== X-Gm-Message-State: AOAM530STJ7F9oGzez4zjfdnZ1ctlYJeRw8WSD93Jb+RxYxwpMXAX5TQ 8LkCQbxP0iahi8P9CEwlbU5prVW8ARJzsx8d X-Google-Smtp-Source: ABdhPJwd9nNYm3DYd2Byuks3HjREQg2YTgz8quYZtUj1OzWjdDyKYalZO2iksIomwRXuD1Ru4pNd6g== X-Received: by 2002:a65:56cb:: with SMTP id w11mr1696082pgs.88.1611873737546; Thu, 28 Jan 2021 14:42:17 -0800 (PST) From: Richard Henderson To: qemu-devel@nongnu.org Subject: [PATCH v4 20/23] linux-user/aarch64: Signal SEGV_MTEAERR for async tag check error Date: Thu, 28 Jan 2021 12:41:38 -1000 Message-Id: <20210128224141.638790-21-richard.henderson@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210128224141.638790-1-richard.henderson@linaro.org> References: <20210128224141.638790-1-richard.henderson@linaro.org> 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=2607:f8b0:4864:20::435; envelope-from=richard.henderson@linaro.org; helo=mail-pf1-x435.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=unavailable 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: peter.maydell@linaro.org, qemu-arm@nongnu.org Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" The real kernel collects _TIF_MTE_ASYNC_FAULT into the current thread's state on any kernel entry (interrupt, exception etc), and then delivers the signal in advance of resuming the thread. This means that while the signal won't be delivered immediately, it will not be delayed forever -- at minimum it will be delivered after the next clock interrupt. We don't have a clock interrupt in linux-user, so we issue a cpu_kick to signal a return to the main loop at the end of the current TB. Signed-off-by: Richard Henderson Reviewed-by: Peter Maydell --- linux-user/aarch64/target_signal.h | 1 + linux-user/aarch64/cpu_loop.c | 11 +++++++++++ target/arm/mte_helper.c | 10 ++++++++++ 3 files changed, 22 insertions(+) diff --git a/linux-user/aarch64/target_signal.h b/linux-user/aarch64/target= _signal.h index 777fb667fe..18013e1b23 100644 --- a/linux-user/aarch64/target_signal.h +++ b/linux-user/aarch64/target_signal.h @@ -21,6 +21,7 @@ typedef struct target_sigaltstack { =20 #include "../generic/signal.h" =20 +#define TARGET_SEGV_MTEAERR 8 /* Asynchronous ARM MTE error */ #define TARGET_SEGV_MTESERR 9 /* Synchronous ARM MTE exception */ =20 #define TARGET_ARCH_HAS_SETUP_FRAME diff --git a/linux-user/aarch64/cpu_loop.c b/linux-user/aarch64/cpu_loop.c index b6a2e65593..7c42f65706 100644 --- a/linux-user/aarch64/cpu_loop.c +++ b/linux-user/aarch64/cpu_loop.c @@ -164,6 +164,17 @@ void cpu_loop(CPUARMState *env) EXCP_DUMP(env, "qemu: unhandled CPU exception 0x%x - aborting\= n", trapnr); abort(); } + + /* Check for MTE asynchronous faults */ + if (unlikely(env->cp15.tfsr_el[0])) { + env->cp15.tfsr_el[0] =3D 0; + info.si_signo =3D TARGET_SIGSEGV; + info.si_errno =3D 0; + info._sifields._sigfault._addr =3D 0; + info.si_code =3D TARGET_SEGV_MTEAERR; + queue_signal(env, info.si_signo, QEMU_SI_FAULT, &info); + } + process_pending_signals(env); /* Exception return on AArch64 always clears the exclusive monitor, * so any return to running guest code implies this. diff --git a/target/arm/mte_helper.c b/target/arm/mte_helper.c index 153bd1e9df..d55f8d1e1e 100644 --- a/target/arm/mte_helper.c +++ b/target/arm/mte_helper.c @@ -565,6 +565,16 @@ static void mte_check_fail(CPUARMState *env, uint32_t = desc, select =3D 0; } env->cp15.tfsr_el[el] |=3D 1 << select; +#ifdef CONFIG_USER_ONLY + /* + * Stand in for a timer irq, setting _TIF_MTE_ASYNC_FAULT, + * which then sends a SIGSEGV when the thread is next scheduled. + * This cpu will return to the main loop at the end of the TB, + * which is rather sooner than "normal". But the alternative + * is waiting until the next syscall. + */ + qemu_cpu_kick(env_cpu(env)); +#endif break; =20 default: --=20 2.25.1