From patchwork Thu May 12 13:11:45 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cornelia Huck X-Patchwork-Id: 12847692 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8C24C433FE for ; Thu, 12 May 2022 13:12:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351103AbiELNMP (ORCPT ); Thu, 12 May 2022 09:12:15 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38368 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354062AbiELNMI (ORCPT ); Thu, 12 May 2022 09:12:08 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id F113ABCE9D for ; Thu, 12 May 2022 06:11:59 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1652361119; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=w9QzHOYviTr+OO0iuFKFM8CRDc6/CGD4m0dOzezLDt4=; b=LtVoDAIDgtHrT5wewQbKWf7BV05IvKXdTzYesLuP8E5gDRSp8VL+NtMbLRTyw6h+xJAGw/ EHjL7mPJbZvcHsgs+mtmEyFI1BTNFk5437GHoy+RdnR/Co0MYTfkrP9U7TXpdZSpAcxmYz 19Z0mq4vJn2aZsZ1LtTJnMF4+7G2I84= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-478-nKi-JwR8Pj6g457j47Az9w-1; Thu, 12 May 2022 09:11:55 -0400 X-MC-Unique: nKi-JwR8Pj6g457j47Az9w-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 32658811E84; Thu, 12 May 2022 13:11:55 +0000 (UTC) Received: from gondolin.fritz.box (unknown [10.39.193.157]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8A27553CF; Thu, 12 May 2022 13:11:53 +0000 (UTC) From: Cornelia Huck To: Peter Maydell , Thomas Huth , Laurent Vivier Cc: Andrew Jones , qemu-arm@nongnu.org, qemu-devel@nongnu.org, kvm@vger.kernel.org, Cornelia Huck Subject: [PATCH RFC 1/2] arm/kvm: enable MTE if available Date: Thu, 12 May 2022 15:11:45 +0200 Message-Id: <20220512131146.78457-2-cohuck@redhat.com> In-Reply-To: <20220512131146.78457-1-cohuck@redhat.com> References: <20220512131146.78457-1-cohuck@redhat.com> MIME-Version: 1.0 Content-type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org We need to disable migration, as we do not yet have a way to migrate the tags as well. Signed-off-by: Cornelia Huck --- target/arm/cpu.c | 18 ++++------ target/arm/cpu.h | 4 +++ target/arm/cpu64.c | 78 ++++++++++++++++++++++++++++++++++++++++++++ target/arm/kvm64.c | 5 +++ target/arm/kvm_arm.h | 12 +++++++ target/arm/monitor.c | 1 + 6 files changed, 106 insertions(+), 12 deletions(-) diff --git a/target/arm/cpu.c b/target/arm/cpu.c index 029f644768b1..f0505815b1e7 100644 --- a/target/arm/cpu.c +++ b/target/arm/cpu.c @@ -1435,6 +1435,11 @@ void arm_cpu_finalize_features(ARMCPU *cpu, Error **errp) error_propagate(errp, local_err); return; } + arm_cpu_mte_finalize(cpu, &local_err); + if (local_err != NULL) { + error_propagate(errp, local_err); + return; + } } if (kvm_enabled()) { @@ -1504,7 +1509,7 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp) } if (cpu->tag_memory) { error_setg(errp, - "Cannot enable KVM when guest CPUs has MTE enabled"); + "Cannot enable KVM when guest CPUs has tag memory enabled"); return; } } @@ -1882,17 +1887,6 @@ static void arm_cpu_realizefn(DeviceState *dev, Error **errp) ID_PFR1, VIRTUALIZATION, 0); } -#ifndef CONFIG_USER_ONLY - if (cpu->tag_memory == NULL && cpu_isar_feature(aa64_mte, cpu)) { - /* - * Disable the MTE feature bits if we do not have tag-memory - * provided by the machine. - */ - cpu->isar.id_aa64pfr1 = - FIELD_DP64(cpu->isar.id_aa64pfr1, ID_AA64PFR1, MTE, 0); - } -#endif - /* MPU can be configured out of a PMSA CPU either by setting has-mpu * to false or by setting pmsav7-dregion to 0. */ diff --git a/target/arm/cpu.h b/target/arm/cpu.h index 18ca61e8e25b..183506713e96 100644 --- a/target/arm/cpu.h +++ b/target/arm/cpu.h @@ -208,11 +208,13 @@ typedef struct { void arm_cpu_sve_finalize(ARMCPU *cpu, Error **errp); void arm_cpu_pauth_finalize(ARMCPU *cpu, Error **errp); void arm_cpu_lpa2_finalize(ARMCPU *cpu, Error **errp); +void arm_cpu_mte_finalize(ARMCPU *cpu, Error **errp); #else # define ARM_MAX_VQ 1 static inline void arm_cpu_sve_finalize(ARMCPU *cpu, Error **errp) { } static inline void arm_cpu_pauth_finalize(ARMCPU *cpu, Error **errp) { } static inline void arm_cpu_lpa2_finalize(ARMCPU *cpu, Error **errp) { } +static inline void arm_cpu_mte_finalize(ARMCPU *cpu, Error **errp) { } #endif typedef struct ARMVectorReg { @@ -993,6 +995,7 @@ struct ArchCPU { bool prop_pauth; bool prop_pauth_impdef; bool prop_lpa2; + bool prop_mte; /* DCZ blocksize, in log_2(words), ie low 4 bits of DCZID_EL0 */ uint32_t dcz_blocksize; @@ -1091,6 +1094,7 @@ void aarch64_sve_change_el(CPUARMState *env, int old_el, int new_el, bool el0_a64); void aarch64_add_sve_properties(Object *obj); void aarch64_add_pauth_properties(Object *obj); +void aarch64_add_mte_properties(Object *obj); /* * SVE registers are encoded in KVM's memory in an endianness-invariant format. diff --git a/target/arm/cpu64.c b/target/arm/cpu64.c index 04427e073f17..eea9ad195470 100644 --- a/target/arm/cpu64.c +++ b/target/arm/cpu64.c @@ -35,7 +35,11 @@ #include "qapi/visitor.h" #include "hw/qdev-properties.h" #include "internals.h" +#include "migration/blocker.h" +#ifdef CONFIG_KVM +static Error *mte_migration_blocker; +#endif static void aarch64_a57_initfn(Object *obj) { @@ -785,6 +789,78 @@ void arm_cpu_lpa2_finalize(ARMCPU *cpu, Error **errp) cpu->isar.id_aa64mmfr0 = t; } +static Property arm_cpu_mte_property = + DEFINE_PROP_BOOL("mte", ARMCPU, prop_mte, true); + +void aarch64_add_mte_properties(Object *obj) +{ + ARMCPU *cpu = ARM_CPU(obj); + + /* + * For tcg, the machine type may provide tag memory for MTE emulation. + * We do not know whether that is the case at this point in time, so + * default MTE to on and check later. + * This preserves pre-existing behaviour, but is really a bit awkward. + */ + qdev_property_add_static(DEVICE(obj), &arm_cpu_mte_property); + if (kvm_enabled()) { + /* + * Default MTE to off, as long as migration support is not + * yet implemented. + * TODO: implement migration support for kvm + */ + cpu->prop_mte = false; + } +} + +void arm_cpu_mte_finalize(ARMCPU *cpu, Error **errp) +{ + if (!cpu->prop_mte) { + /* Disable MTE feature bits. */ + cpu->isar.id_aa64pfr1 = + FIELD_DP64(cpu->isar.id_aa64pfr1, ID_AA64PFR1, MTE, 0); + return; + } +#ifndef CONFIG_USER_ONLY + if (!kvm_enabled()) { + if (cpu_isar_feature(aa64_mte, cpu) && !cpu->tag_memory) { + /* + * Disable the MTE feature bits, unless we have tag-memory + * provided by the machine. + * This silent downgrade is not really nice if the user had + * explicitly requested MTE to be enabled by the cpu, but it + * preserves pre-existing behaviour. In an ideal world, we + * would fail if MTE was requested, but no tag memory has + * been provided. + */ + cpu->isar.id_aa64pfr1 = + FIELD_DP64(cpu->isar.id_aa64pfr1, ID_AA64PFR1, MTE, 0); + } + if (!cpu_isar_feature(aa64_mte, cpu)) { + cpu->prop_mte = false; + } + return; + } + if (kvm_arm_mte_supported()) { +#ifdef CONFIG_KVM + if (kvm_vm_enable_cap(kvm_state, KVM_CAP_ARM_MTE, 0)) { + error_setg(errp, "Failed to enable KVM_CAP_ARM_MTE"); + } else { + /* TODO: add proper migration support with MTE enabled */ + if (!mte_migration_blocker) { + error_setg(&mte_migration_blocker, + "Live migration disabled due to MTE enabled"); + if (migrate_add_blocker(mte_migration_blocker, NULL)) { + error_setg(errp, "Failed to add MTE migration blocker"); + } + } + } +#endif + } + /* When HVF provides support for MTE, add it here */ +#endif +} + static void aarch64_host_initfn(Object *obj) { #if defined(CONFIG_KVM) @@ -793,6 +869,7 @@ static void aarch64_host_initfn(Object *obj) if (arm_feature(&cpu->env, ARM_FEATURE_AARCH64)) { aarch64_add_sve_properties(obj); aarch64_add_pauth_properties(obj); + aarch64_add_mte_properties(obj); } #elif defined(CONFIG_HVF) ARMCPU *cpu = ARM_CPU(obj); @@ -958,6 +1035,7 @@ static void aarch64_max_initfn(Object *obj) object_property_add(obj, "sve-max-vq", "uint32", cpu_max_get_sve_max_vq, cpu_max_set_sve_max_vq, NULL, NULL); qdev_property_add_static(DEVICE(obj), &arm_cpu_lpa2_property); + aarch64_add_mte_properties(obj); } static void aarch64_a64fx_initfn(Object *obj) diff --git a/target/arm/kvm64.c b/target/arm/kvm64.c index b8cfaf5782ac..d129a264a3f6 100644 --- a/target/arm/kvm64.c +++ b/target/arm/kvm64.c @@ -746,6 +746,11 @@ bool kvm_arm_steal_time_supported(void) return kvm_check_extension(kvm_state, KVM_CAP_STEAL_TIME); } +bool kvm_arm_mte_supported(void) +{ + return kvm_check_extension(kvm_state, KVM_CAP_ARM_MTE); +} + QEMU_BUILD_BUG_ON(KVM_ARM64_SVE_VQ_MIN != 1); void kvm_arm_sve_get_vls(CPUState *cs, unsigned long *map) diff --git a/target/arm/kvm_arm.h b/target/arm/kvm_arm.h index b7f78b521545..13f06ed5e0ea 100644 --- a/target/arm/kvm_arm.h +++ b/target/arm/kvm_arm.h @@ -306,6 +306,13 @@ bool kvm_arm_pmu_supported(void); */ bool kvm_arm_sve_supported(void); +/** + * kvm_arm_mte_supported: + * + * Returns: true if KVM can enable MTE, and false otherwise. + */ +bool kvm_arm_mte_supported(void); + /** * kvm_arm_get_max_vm_ipa_size: * @ms: Machine state handle @@ -396,6 +403,11 @@ static inline bool kvm_arm_steal_time_supported(void) return false; } +static inline bool kvm_arm_mte_supported(void) +{ + return false; +} + /* * These functions should never actually be called without KVM support. */ diff --git a/target/arm/monitor.c b/target/arm/monitor.c index 80c64fa3556d..f13ff2664b67 100644 --- a/target/arm/monitor.c +++ b/target/arm/monitor.c @@ -96,6 +96,7 @@ static const char *cpu_model_advertised_features[] = { "sve1408", "sve1536", "sve1664", "sve1792", "sve1920", "sve2048", "kvm-no-adjvtime", "kvm-steal-time", "pauth", "pauth-impdef", + "mte", NULL };