From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 32F52C54EAA for ; Fri, 27 Jan 2023 11:39:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=V2P/Eldf/THRpv7PzIiJ1mHnj+xWQOgRmM5J8uJs5Ak=; b=O0oal2Ej4lTkGp BjWpcKTb/ely8IfYVJUjHYRqH6uU7aJgzB8OuasY28WYC+opEdxCiPA2FKHxTTy0EC93E5t1XknX9 BocUPk9TVmSUbpvkVdnHJstrD/flujmKOWLSCU9meZmhv8R/6BvT/QBigaej62wHXa3F9WSbemDZA KB2hNXYgM1dfDFbYnHw/33byhPnPC5b0c6CqmFHXHcBFOAjzgLZGoE6qM4vkkdkSVRAV4G58jaI7h curCFR0lvt8FTSYWk1ZBc02Y9e+TMDaWR0tVsrPVljzeLcMc8itbBKVDnW3C+UUwD0Bba2PLekys9 wtRZ2py0QsK4zWM1rKUA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pLN3y-00EC0T-7U; Fri, 27 Jan 2023 11:38:34 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1pLMva-00E7vK-Hi for linux-arm-kernel@lists.infradead.org; Fri, 27 Jan 2023 11:29:56 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 872351596; Fri, 27 Jan 2023 03:30:35 -0800 (PST) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.35.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3B9823F64C; Fri, 27 Jan 2023 03:29:51 -0800 (PST) From: Steven Price To: kvm@vger.kernel.org, kvmarm@lists.linux.dev Cc: Steven Price , Catalin Marinas , Marc Zyngier , Will Deacon , James Morse , Oliver Upton , Suzuki K Poulose , Zenghui Yu , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Joey Gouly , Alexandru Elisei , Christoffer Dall , Fuad Tabba , linux-coco@lists.linux.dev Subject: [RFC PATCH 04/28] arm64: RME: Check for RME support at KVM init Date: Fri, 27 Jan 2023 11:29:08 +0000 Message-Id: <20230127112932.38045-5-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230127112932.38045-1-steven.price@arm.com> References: <20230127112248.136810-1-suzuki.poulose@arm.com> <20230127112932.38045-1-steven.price@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230127_032954_752418_BDA31DAF X-CRM114-Status: GOOD ( 20.93 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Query the RMI version number and check if it is a compatible version. A static key is also provided to signal that a supported RMM is available. Functions are provided to query if a VM or VCPU is a realm (or rec) which currently will always return false. Signed-off-by: Steven Price --- arch/arm64/include/asm/kvm_emulate.h | 17 ++++++++++ arch/arm64/include/asm/kvm_host.h | 4 +++ arch/arm64/include/asm/kvm_rme.h | 22 +++++++++++++ arch/arm64/include/asm/virt.h | 1 + arch/arm64/kvm/Makefile | 3 +- arch/arm64/kvm/arm.c | 8 +++++ arch/arm64/kvm/rme.c | 49 ++++++++++++++++++++++++++++ 7 files changed, 103 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/include/asm/kvm_rme.h create mode 100644 arch/arm64/kvm/rme.c diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h index 9bdba47f7e14..5a2b7229e83f 100644 --- a/arch/arm64/include/asm/kvm_emulate.h +++ b/arch/arm64/include/asm/kvm_emulate.h @@ -490,4 +490,21 @@ static inline bool vcpu_has_feature(struct kvm_vcpu *vcpu, int feature) return test_bit(feature, vcpu->arch.features); } +static inline bool kvm_is_realm(struct kvm *kvm) +{ + if (static_branch_unlikely(&kvm_rme_is_available)) + return kvm->arch.is_realm; + return false; +} + +static inline enum realm_state kvm_realm_state(struct kvm *kvm) +{ + return READ_ONCE(kvm->arch.realm.state); +} + +static inline bool vcpu_is_rec(struct kvm_vcpu *vcpu) +{ + return false; +} + #endif /* __ARM64_KVM_EMULATE_H__ */ diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index 35a159d131b5..04347c3a8c6b 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -26,6 +26,7 @@ #include #include #include +#include #define __KVM_HAVE_ARCH_INTC_INITIALIZED @@ -240,6 +241,9 @@ struct kvm_arch { * the associated pKVM instance in the hypervisor. */ struct kvm_protected_vm pkvm; + + bool is_realm; + struct realm realm; }; struct kvm_vcpu_fault_info { diff --git a/arch/arm64/include/asm/kvm_rme.h b/arch/arm64/include/asm/kvm_rme.h new file mode 100644 index 000000000000..c26bc2c6770d --- /dev/null +++ b/arch/arm64/include/asm/kvm_rme.h @@ -0,0 +1,22 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 2023 ARM Ltd. + */ + +#ifndef __ASM_KVM_RME_H +#define __ASM_KVM_RME_H + +enum realm_state { + REALM_STATE_NONE, + REALM_STATE_NEW, + REALM_STATE_ACTIVE, + REALM_STATE_DYING +}; + +struct realm { + enum realm_state state; +}; + +int kvm_init_rme(void); + +#endif diff --git a/arch/arm64/include/asm/virt.h b/arch/arm64/include/asm/virt.h index 4eb601e7de50..be1383e26626 100644 --- a/arch/arm64/include/asm/virt.h +++ b/arch/arm64/include/asm/virt.h @@ -80,6 +80,7 @@ void __hyp_set_vectors(phys_addr_t phys_vector_base); void __hyp_reset_vectors(void); DECLARE_STATIC_KEY_FALSE(kvm_protected_mode_initialized); +DECLARE_STATIC_KEY_FALSE(kvm_rme_is_available); /* Reports the availability of HYP mode */ static inline bool is_hyp_mode_available(void) diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile index 5e33c2d4645a..d2f0400c50da 100644 --- a/arch/arm64/kvm/Makefile +++ b/arch/arm64/kvm/Makefile @@ -20,7 +20,8 @@ kvm-y += arm.o mmu.o mmio.o psci.o hypercalls.o pvtime.o \ vgic/vgic-v3.o vgic/vgic-v4.o \ vgic/vgic-mmio.o vgic/vgic-mmio-v2.o \ vgic/vgic-mmio-v3.o vgic/vgic-kvm-device.o \ - vgic/vgic-its.o vgic/vgic-debug.o + vgic/vgic-its.o vgic/vgic-debug.o \ + rme.o kvm-$(CONFIG_HW_PERF_EVENTS) += pmu-emul.o pmu.o diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index 9c5573bc4614..d97b39d042ab 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include @@ -47,6 +48,7 @@ static enum kvm_mode kvm_mode = KVM_MODE_DEFAULT; DEFINE_STATIC_KEY_FALSE(kvm_protected_mode_initialized); +DEFINE_STATIC_KEY_FALSE(kvm_rme_is_available); DECLARE_KVM_HYP_PER_CPU(unsigned long, kvm_hyp_vector); @@ -2213,6 +2215,12 @@ int kvm_arch_init(void *opaque) in_hyp_mode = is_kernel_in_hyp_mode(); + if (in_hyp_mode) { + err = kvm_init_rme(); + if (err) + return err; + } + if (cpus_have_final_cap(ARM64_WORKAROUND_DEVICE_LOAD_ACQUIRE) || cpus_have_final_cap(ARM64_WORKAROUND_1508412)) kvm_info("Guests without required CPU erratum workarounds can deadlock system!\n" \ diff --git a/arch/arm64/kvm/rme.c b/arch/arm64/kvm/rme.c new file mode 100644 index 000000000000..f6b587bc116e --- /dev/null +++ b/arch/arm64/kvm/rme.c @@ -0,0 +1,49 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2023 ARM Ltd. + */ + +#include + +#include +#include + +static int rmi_check_version(void) +{ + struct arm_smccc_res res; + int version_major, version_minor; + + arm_smccc_1_1_invoke(SMC_RMI_VERSION, &res); + + if (res.a0 == SMCCC_RET_NOT_SUPPORTED) + return -ENXIO; + + version_major = RMI_ABI_VERSION_GET_MAJOR(res.a0); + version_minor = RMI_ABI_VERSION_GET_MINOR(res.a0); + + if (version_major != RMI_ABI_MAJOR_VERSION) { + kvm_err("Unsupported RMI ABI (version %d.%d) we support %d\n", + version_major, version_minor, + RMI_ABI_MAJOR_VERSION); + return -ENXIO; + } + + kvm_info("RMI ABI version %d.%d\n", version_major, version_minor); + + return 0; +} + +int kvm_init_rme(void) +{ + if (PAGE_SIZE != SZ_4K) + /* Only 4k page size on the host is supported */ + return 0; + + if (rmi_check_version()) + /* Continue without realm support */ + return 0; + + /* Future patch will enable static branch kvm_rme_is_available */ + + return 0; +} -- 2.34.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel