From patchwork Fri May 29 15:19:24 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Alex_Benn=C3=A9e?= X-Patchwork-Id: 6508581 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id D032BC0020 for ; Fri, 29 May 2015 15:22:50 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id D527D207D9 for ; Fri, 29 May 2015 15:22:49 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B83902060C for ; Fri, 29 May 2015 15:22:48 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YyM57-0005s1-8H; Fri, 29 May 2015 15:20:21 +0000 Received: from merlin.infradead.org ([2001:4978:20e::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YyM4r-0005Ym-Kx for linux-arm-kernel@bombadil.infradead.org; Fri, 29 May 2015 15:20:05 +0000 Received: from static.88-198-71-155.clients.your-server.de ([88.198.71.155] helo=socrates.bennee.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YyM4p-0006Wy-6f for linux-arm-kernel@lists.infradead.org; Fri, 29 May 2015 15:20:04 +0000 Received: from localhost ([127.0.0.1] helo=zen.linaroharston) by socrates.bennee.com with esmtp (Exim 4.80) (envelope-from ) id 1YyNOS-0005fR-0q; Fri, 29 May 2015 18:44:24 +0200 From: =?UTF-8?q?Alex=20Benn=C3=A9e?= To: qemu-devel@nongnu.org, peter.maydell@linaro.org, christoffer.dall@linaro.org, zhichao.huang@linaro.org Subject: [PATCH v5 6/6] target-arm: kvm - re-inject guest debug exceptions Date: Fri, 29 May 2015 16:19:24 +0100 Message-Id: <1432912764-7073-7-git-send-email-alex.bennee@linaro.org> X-Mailer: git-send-email 2.4.1 In-Reply-To: <1432912764-7073-1-git-send-email-alex.bennee@linaro.org> References: <1432912764-7073-1-git-send-email-alex.bennee@linaro.org> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 127.0.0.1 X-SA-Exim-Mail-From: alex.bennee@linaro.org X-SA-Exim-Scanned: No (on socrates.bennee.com); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150529_112003_399920_A029B580 X-CRM114-Status: GOOD ( 19.11 ) X-Spam-Score: -1.2 (-) Cc: =?UTF-8?q?Alex=20Benn=C3=A9e?= , kvm@vger.kernel.org, marc.zyngier@arm.com, Paolo Bonzini , =?UTF-8?q?Alex=20Benn=C3=A9e?= , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Alex Bennée If we can't find details for the debug exception in our debug state then we can assume the exception is due to debugging inside the guest. To inject the exception into the guest state we re-use the TCG exception code (do_interupt). However while guest debugging is in effect we currently can't handle the guest using single step which is heavily used by GDB. Signed-off-by: Alex Bennée --- v5: - new for v5 --- target-arm/cpu.h | 1 + target-arm/helper-a64.c | 17 ++++++++++++++--- target-arm/internals.h | 1 + target-arm/kvm.c | 30 ++++++++++++++++++++++-------- 4 files changed, 38 insertions(+), 11 deletions(-) diff --git a/target-arm/cpu.h b/target-arm/cpu.h index 083211c..95ae3a8 100644 --- a/target-arm/cpu.h +++ b/target-arm/cpu.h @@ -56,6 +56,7 @@ #define EXCP_SMC 13 /* Secure Monitor Call */ #define EXCP_VIRQ 14 #define EXCP_VFIQ 15 +#define EXCP_WAPT 16 #define ARMV7M_EXCP_RESET 1 #define ARMV7M_EXCP_NMI 2 diff --git a/target-arm/helper-a64.c b/target-arm/helper-a64.c index 861f6fa..32bd27d 100644 --- a/target-arm/helper-a64.c +++ b/target-arm/helper-a64.c @@ -25,6 +25,7 @@ #include "qemu/bitops.h" #include "internals.h" #include "qemu/crc32c.h" +#include "sysemu/kvm.h" #include /* For crc32 */ /* C2.4.7 Multiply and divide */ @@ -478,10 +479,13 @@ void aarch64_cpu_do_interrupt(CPUState *cs) } arm_log_exception(cs->exception_index); - qemu_log_mask(CPU_LOG_INT, "...from EL%d\n", arm_current_el(env)); + qemu_log_mask(CPU_LOG_INT, "...from EL%d PC 0x%" PRIx64 "\n", + arm_current_el(env), env->pc); + if (qemu_loglevel_mask(CPU_LOG_INT) && !excp_is_internal(cs->exception_index)) { - qemu_log_mask(CPU_LOG_INT, "...with ESR 0x%" PRIx32 "\n", + qemu_log_mask(CPU_LOG_INT, "...with ESR %x/0x%" PRIx32 "\n", + env->exception.syndrome >> ARM_EL_EC_SHIFT, env->exception.syndrome); } @@ -494,6 +498,7 @@ void aarch64_cpu_do_interrupt(CPUState *cs) switch (cs->exception_index) { case EXCP_PREFETCH_ABORT: case EXCP_DATA_ABORT: + case EXCP_WAPT: env->cp15.far_el[new_el] = env->exception.vaddress; qemu_log_mask(CPU_LOG_INT, "...with FAR 0x%" PRIx64 "\n", env->cp15.far_el[new_el]); @@ -539,6 +544,12 @@ void aarch64_cpu_do_interrupt(CPUState *cs) aarch64_restore_sp(env, new_el); env->pc = addr; - cs->interrupt_request |= CPU_INTERRUPT_EXITTB; + + qemu_log_mask(CPU_LOG_INT, "...to EL%d PC 0x%" PRIx64 " PSTATE 0x%x\n", + new_el, env->pc, pstate_read(env)); + + if (!kvm_enabled()) { + cs->interrupt_request |= CPU_INTERRUPT_EXITTB; + } } #endif diff --git a/target-arm/internals.h b/target-arm/internals.h index 2cc3017..10e8999 100644 --- a/target-arm/internals.h +++ b/target-arm/internals.h @@ -58,6 +58,7 @@ static const char * const excnames[] = { [EXCP_SMC] = "Secure Monitor Call", [EXCP_VIRQ] = "Virtual IRQ", [EXCP_VFIQ] = "Virtual FIQ", + [EXCP_WAPT] = "Watchpoint", }; static inline void arm_log_exception(int idx) diff --git a/target-arm/kvm.c b/target-arm/kvm.c index e1fccdd..6f608d8 100644 --- a/target-arm/kvm.c +++ b/target-arm/kvm.c @@ -523,9 +523,11 @@ static int kvm_handle_debug(CPUState *cs, struct kvm_run *run) struct kvm_debug_exit_arch *arch_info = &run->debug.arch; int hsr_ec = arch_info->hsr >> ARM_EL_EC_SHIFT; ARMCPU *cpu = ARM_CPU(cs); + CPUClass *cc = CPU_GET_CLASS(cs); CPUARMState *env = &cpu->env; + int forward_excp = EXCP_BKPT; - /* Ensure PC is synchronised */ + /* Ensure all state is synchronised */ kvm_cpu_synchronize_state(cs); switch (hsr_ec) { @@ -533,7 +535,14 @@ static int kvm_handle_debug(CPUState *cs, struct kvm_run *run) if (cs->singlestep_enabled) { return true; } else { - error_report("Came out of SINGLE STEP when not enabled"); + /* + * The kernel should have supressed the guests ability to + * single step at this point so something has gone wrong. + */ + error_report("%s: guest single-step while debugging unsupported" + " (%"PRIx64", %"PRIx32")\n", + __func__, env->pc, arch_info->hsr); + return false; } break; case EC_AA64_BKPT: @@ -549,19 +558,24 @@ static int kvm_handle_debug(CPUState *cs, struct kvm_run *run) case EC_WATCHPOINT: if (kvm_arm_find_hw_watchpoint(cs, arch_info->far)) { return true; + } else { + forward_excp = EXCP_WAPT; } break; default: error_report("%s: unhandled debug exit (%"PRIx32", %"PRIx64")\n", __func__, arch_info->hsr, env->pc); + return false; } - /* If we don't handle this it could be it really is for the - guest to handle */ - qemu_log_mask(LOG_UNIMP, - "%s: re-injecting exception not yet implemented" - " (0x%"PRIx32", %"PRIx64")\n", - __func__, hsr_ec, env->pc); + /* If we are not handling the debug exception it must belong to + * the guest. Let's re-use the existing TCG interrupt code to set + * everything up properly + */ + cs->exception_index = forward_excp; + env->exception.syndrome = arch_info->hsr; + env->exception.vaddress = arch_info->far; + cc->do_interrupt(cs); return false; }