From patchwork Mon Jun 10 13:41:34 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Steven Price X-Patchwork-Id: 13692018 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C916D7E767; Mon, 10 Jun 2024 13:43:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.140.110.172 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718026992; cv=none; b=qhb3dr0/wT9Uoc71GDqyjXNJpzohwdBbQA9T/JONW1bwjXOoFR+Hh5uJ+GCQgEhjWf2UX/edYys3BzwOiE3n+UHEi5BRLTt5z6zQEuUckj/ZXmNDTLvU1gbOMbjzrHbWGi0a/VaRYbjJdx0hWW/IqQWKUuESIJ24gsJ010fjIIc= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718026992; c=relaxed/simple; bh=CpgPhKkUlBLdpu95isd0guqk3LvoWrkkQgt4hSrIbag=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=hnhUVsCqVfh4T5tTicCIUcrbnfeDtu/+rfrKKN+l9ERrpo/yTnbj7h0neT3/efDaNi7P7APUHVv7/FJiJvw1pEwAwBbwvYIxc4kRDRfCfqyTdtkMC9k3vLxsleRCopL5AtnogH6s28M3TBodQB2r6khIeLXvm+pJjlH8kJNQokA= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com; spf=pass smtp.mailfrom=arm.com; arc=none smtp.client-ip=217.140.110.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=arm.com 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 056941688; Mon, 10 Jun 2024 06:43:34 -0700 (PDT) Received: from e122027.cambridge.arm.com (e122027.cambridge.arm.com [10.1.35.41]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 1DB713F58B; Mon, 10 Jun 2024 06:43:06 -0700 (PDT) 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, Ganapatrao Kulkarni Subject: [PATCH v3 15/43] arm64: RME: Support for the VGIC in realms Date: Mon, 10 Jun 2024 14:41:34 +0100 Message-Id: <20240610134202.54893-16-steven.price@arm.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240610134202.54893-1-steven.price@arm.com> References: <20240610134202.54893-1-steven.price@arm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 The RMM provides emulation of a VGIC to the realm guest but delegates much of the handling to the host. Implement support in KVM for saving/restoring state to/from the REC structure. Signed-off-by: Steven Price --- v3: Changes to adapt to rebasing only. --- arch/arm64/kvm/arm.c | 15 +++++++++++--- arch/arm64/kvm/vgic/vgic-v3.c | 8 +++++++- arch/arm64/kvm/vgic/vgic.c | 37 +++++++++++++++++++++++++++++++++-- 3 files changed, 54 insertions(+), 6 deletions(-) diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c index d7c62796c9c0..84c3dc1d89b8 100644 --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -652,17 +652,22 @@ void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu) void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu) { + kvm_timer_vcpu_put(vcpu); + kvm_vgic_put(vcpu); + + vcpu->cpu = -1; + + if (vcpu_is_rec(vcpu)) + return; + kvm_arch_vcpu_put_debug_state_flags(vcpu); kvm_arch_vcpu_put_fp(vcpu); if (has_vhe()) kvm_vcpu_put_vhe(vcpu); - kvm_timer_vcpu_put(vcpu); - kvm_vgic_put(vcpu); kvm_vcpu_pmu_restore_host(vcpu); kvm_arm_vmid_clear_active(); vcpu_clear_on_unsupported_cpu(vcpu); - vcpu->cpu = -1; } static void __kvm_arm_vcpu_power_off(struct kvm_vcpu *vcpu) @@ -872,6 +877,10 @@ int kvm_arch_vcpu_run_pid_change(struct kvm_vcpu *vcpu) } if (!irqchip_in_kernel(kvm)) { + /* Userspace irqchip not yet supported with Realms */ + if (kvm_is_realm(vcpu->kvm)) + return -EOPNOTSUPP; + /* * Tell the rest of the code that there are userspace irqchip * VMs in the wild. diff --git a/arch/arm64/kvm/vgic/vgic-v3.c b/arch/arm64/kvm/vgic/vgic-v3.c index ed6e412cd74b..ffb42966fe63 100644 --- a/arch/arm64/kvm/vgic/vgic-v3.c +++ b/arch/arm64/kvm/vgic/vgic-v3.c @@ -7,9 +7,11 @@ #include #include #include +#include #include #include #include +#include #include "vgic.h" @@ -667,7 +669,8 @@ int vgic_v3_probe(const struct gic_kvm_info *info) (unsigned long long)info->vcpu.start); } else if (kvm_get_mode() != KVM_MODE_PROTECTED) { kvm_vgic_global_state.vcpu_base = info->vcpu.start; - kvm_vgic_global_state.can_emulate_gicv2 = true; + if (!static_branch_unlikely(&kvm_rme_is_available)) + kvm_vgic_global_state.can_emulate_gicv2 = true; ret = kvm_register_vgic_device(KVM_DEV_TYPE_ARM_VGIC_V2); if (ret) { kvm_err("Cannot register GICv2 KVM device.\n"); @@ -734,6 +737,9 @@ void vgic_v3_put(struct kvm_vcpu *vcpu) { struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; + if (vcpu_is_rec(vcpu)) + cpu_if->vgic_vmcr = vcpu->arch.rec.run->exit.gicv3_vmcr; + kvm_call_hyp(__vgic_v3_save_vmcr_aprs, cpu_if); WARN_ON(vgic_v4_put(vcpu)); diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c index f07b3ddff7d4..46f7065e993c 100644 --- a/arch/arm64/kvm/vgic/vgic.c +++ b/arch/arm64/kvm/vgic/vgic.c @@ -10,7 +10,9 @@ #include #include +#include #include +#include #include "vgic.h" @@ -843,10 +845,23 @@ static inline bool can_access_vgic_from_kernel(void) return !static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) || has_vhe(); } +static inline void vgic_rmm_save_state(struct kvm_vcpu *vcpu) +{ + struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; + int i; + + for (i = 0; i < kvm_vgic_global_state.nr_lr; i++) { + cpu_if->vgic_lr[i] = vcpu->arch.rec.run->exit.gicv3_lrs[i]; + vcpu->arch.rec.run->enter.gicv3_lrs[i] = 0; + } +} + static inline void vgic_save_state(struct kvm_vcpu *vcpu) { if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) vgic_v2_save_state(vcpu); + else if (vcpu_is_rec(vcpu)) + vgic_rmm_save_state(vcpu); else __vgic_v3_save_state(&vcpu->arch.vgic_cpu.vgic_v3); } @@ -873,10 +888,28 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) vgic_prune_ap_list(vcpu); } +static inline void vgic_rmm_restore_state(struct kvm_vcpu *vcpu) +{ + struct vgic_v3_cpu_if *cpu_if = &vcpu->arch.vgic_cpu.vgic_v3; + int i; + + for (i = 0; i < kvm_vgic_global_state.nr_lr; i++) { + vcpu->arch.rec.run->enter.gicv3_lrs[i] = cpu_if->vgic_lr[i]; + /* + * Also populate the rec.run->exit copies so that a late + * decision to back out from entering the realm doesn't cause + * the state to be lost + */ + vcpu->arch.rec.run->exit.gicv3_lrs[i] = cpu_if->vgic_lr[i]; + } +} + static inline void vgic_restore_state(struct kvm_vcpu *vcpu) { if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) vgic_v2_restore_state(vcpu); + else if (vcpu_is_rec(vcpu)) + vgic_rmm_restore_state(vcpu); else __vgic_v3_restore_state(&vcpu->arch.vgic_cpu.vgic_v3); } @@ -917,7 +950,7 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) void kvm_vgic_load(struct kvm_vcpu *vcpu) { - if (unlikely(!vgic_initialized(vcpu->kvm))) + if (unlikely(!vgic_initialized(vcpu->kvm)) || vcpu_is_rec(vcpu)) return; if (kvm_vgic_global_state.type == VGIC_V2) @@ -928,7 +961,7 @@ void kvm_vgic_load(struct kvm_vcpu *vcpu) void kvm_vgic_put(struct kvm_vcpu *vcpu) { - if (unlikely(!vgic_initialized(vcpu->kvm))) + if (unlikely(!vgic_initialized(vcpu->kvm)) || vcpu_is_rec(vcpu)) return; if (kvm_vgic_global_state.type == VGIC_V2)