From patchwork Tue Aug 28 13:49:15 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dongjiu Geng X-Patchwork-Id: 962958 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=nongnu.org (client-ip=2001:4830:134:3::11; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=huawei.com Received: from lists.gnu.org (lists.gnu.org [IPv6:2001:4830:134:3::11]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4209GK5FrHz9s1x for ; Tue, 28 Aug 2018 23:54:01 +1000 (AEST) Received: from localhost ([::1]:38328 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fueRT-0003k0-Di for incoming@patchwork.ozlabs.org; Tue, 28 Aug 2018 09:53:59 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:41973) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fueOm-00010K-9t for qemu-devel@nongnu.org; Tue, 28 Aug 2018 09:51:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fueOl-0007gQ-5v for qemu-devel@nongnu.org; Tue, 28 Aug 2018 09:51:12 -0400 Received: from szxga04-in.huawei.com ([45.249.212.190]:2645 helo=huawei.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fueOa-0007B1-LK; Tue, 28 Aug 2018 09:51:01 -0400 Received: from DGGEMS403-HUB.china.huawei.com (unknown [172.30.72.58]) by Forcepoint Email with ESMTP id 7310A94CF407A; Tue, 28 Aug 2018 21:50:51 +0800 (CST) Received: from SHA150392835-N.china.huawei.com (10.45.52.187) by DGGEMS403-HUB.china.huawei.com (10.3.19.203) with Microsoft SMTP Server id 14.3.399.0; Tue, 28 Aug 2018 21:50:46 +0800 From: Dongjiu Geng To: , , , , , Date: Tue, 28 Aug 2018 21:49:15 +0800 Message-ID: <20180828134915.8744-3-gengdongjiu@huawei.com> X-Mailer: git-send-email 2.11.0.windows.1 In-Reply-To: <20180828134915.8744-1-gengdongjiu@huawei.com> References: <20180828134915.8744-1-gengdongjiu@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.45.52.187] X-CFilter-Loop: Reflected X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 45.249.212.190 Subject: [Qemu-devel] [PATCH v8 2/2] target: arm: Add support for VCPU event states X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" This patch extends the qemu-kvm state sync logic with support for KVM_GET/SET_VCPU_EVENTS, giving access to yet missing SError exception. And also it can support the exception state migration. Signed-off-by: Dongjiu Geng --- change since v7: 1. Change "pending" and "has_esr" from uint32_t to uint8_t for CPUARMState 2. Add error_report() in kvm_get_vcpu_events() Change since v6: 1. Add cover letter 2. Change name "cpu/ras" to "cpu/serror" 3. Add some comments and check the ioctl return value for kvm_put_vcpu_events() Change since v5: address Peter's comments: 1. Move the "struct serror" before the "end_reset_fields" in CPUARMState 2. Remove ARM_FEATURE_RAS_EXT and add a variable have_inject_serror_esr 3. Use the variable have_inject_serror_esr to track whether the kernel has state we need to migrate 4. Remove printf() in kvm_arch_put_registers() 5. ras_needed/vmstate_ras to serror_needed/vmstate_serror 6. Check to use "return env.serror.pending != 0" instead of "arm_feature(env, ARM_FEATURE_RAS_EXT)" in the ras_needed() Change since v4: 1. Rebase the code to latest Change since v3: 1. Add a new new subsection with a suitable 'ras_needed' function controlling whether it is present 2. Add a ARM_FEATURE_RAS feature bit for CPUARMState --- target/arm/cpu.h | 7 ++++++ target/arm/kvm64.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++++++++ target/arm/machine.c | 22 +++++++++++++++++ 3 files changed, 98 insertions(+) diff --git a/target/arm/cpu.h b/target/arm/cpu.h index 65c0fa0..a8454f5 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -530,6 +530,13 @@ typedef struct CPUARMState { */ } exception; + /* Information associated with an SError */ + struct { + uint8_t pending; + uint8_t has_esr; + uint64_t esr; + } serror; + /* Thumb-2 EE state. */ uint32_t teecr; uint32_t teehbr; diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index e0b8246..e8705e2 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -29,6 +29,7 @@ #include "hw/arm/arm.h" static bool have_guest_debug; +static bool have_inject_serror_esr; /* * Although the ARM implementation of hardware assisted debugging @@ -546,6 +547,10 @@ int kvm_arch_init_vcpu(CPUState *cs) kvm_arm_init_debug(cs); + /* Check whether userspace can specify guest syndrome value */ + have_inject_serror_esr = kvm_check_extension(cs->kvm_state, + KVM_CAP_ARM_INJECT_SERROR_ESR); + return kvm_arm_init_cpreg_list(cpu); } @@ -600,6 +605,60 @@ int kvm_arm_cpreg_level(uint64_t regidx) #define AARCH64_SIMD_CTRL_REG(x) (KVM_REG_ARM64 | KVM_REG_SIZE_U32 | \ KVM_REG_ARM_CORE | KVM_REG_ARM_CORE_REG(x)) +static int kvm_put_vcpu_events(ARMCPU *cpu) +{ + CPUARMState *env = &cpu->env; + struct kvm_vcpu_events events = {}; + int ret; + + if (!kvm_has_vcpu_events()) { + return 0; + } + + memset(&events, 0, sizeof(events)); + events.exception.serror_pending = env->serror.pending; + + /* Inject SError to guest with specified syndrome if host kernel + * supports it, otherwise inject SError without syndrome. + */ + if (have_inject_serror_esr) { + events.exception.serror_has_esr = env->serror.has_esr; + events.exception.serror_esr = env->serror.esr; + } + + ret = kvm_vcpu_ioctl(CPU(cpu), KVM_SET_VCPU_EVENTS, &events); + if (ret) { + error_report("failed to put vcpu events"); + } + + return ret; +} + +static int kvm_get_vcpu_events(ARMCPU *cpu) +{ + CPUARMState *env = &cpu->env; + struct kvm_vcpu_events events; + int ret; + + if (!kvm_has_vcpu_events()) { + return 0; + } + + memset(&events, 0, sizeof(events)); + ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_VCPU_EVENTS, &events); + + if (ret) { + error_report("failed to get vcpu events"); + return ret; + } + + env->serror.pending = events.exception.serror_pending; + env->serror.has_esr = events.exception.serror_has_esr; + env->serror.esr = events.exception.serror_esr; + + return 0; +} + int kvm_arch_put_registers(CPUState *cs, int level) { struct kvm_one_reg reg; @@ -727,6 +786,11 @@ int kvm_arch_put_registers(CPUState *cs, int level) return ret; } + ret = kvm_put_vcpu_events(cpu); + if (ret) { + return ret; + } + if (!write_list_to_kvmstate(cpu, level)) { return EINVAL; } @@ -863,6 +927,11 @@ int kvm_arch_get_registers(CPUState *cs) } vfp_set_fpcr(env, fpr); + ret = kvm_get_vcpu_events(cpu); + if (ret) { + return ret; + } + if (!write_kvmstate_to_list(cpu)) { return EINVAL; } diff --git a/target/arm/machine.c b/target/arm/machine.c index ff4ec22..32bcde0 100644 --- a/target/arm/machine.c +++ b/target/arm/machine.c @@ -172,6 +172,27 @@ static const VMStateDescription vmstate_sve = { }; #endif /* AARCH64 */ +static bool serror_needed(void *opaque) +{ + ARMCPU *cpu = opaque; + CPUARMState *env = &cpu->env; + + return env->serror.pending != 0; +} + +static const VMStateDescription vmstate_serror = { + .name = "cpu/serror", + .version_id = 1, + .minimum_version_id = 1, + .needed = serror_needed, + .fields = (VMStateField[]) { + VMSTATE_UINT8(env.serror.pending, ARMCPU), + VMSTATE_UINT8(env.serror.has_esr, ARMCPU), + VMSTATE_UINT64(env.serror.esr, ARMCPU), + VMSTATE_END_OF_LIST() + } +}; + static bool m_needed(void *opaque) { ARMCPU *cpu = opaque; @@ -726,6 +747,7 @@ const VMStateDescription vmstate_arm_cpu = { #ifdef TARGET_AARCH64 &vmstate_sve, #endif + &vmstate_serror, NULL } };