From patchwork Thu Mar 16 21:14:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Oliver Upton X-Patchwork-Id: 13178323 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 D8201C6FD1F for ; Thu, 16 Mar 2023 21:15:34 +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=vDL0Yq2c2Ym8dXRO7pl6a1/6xk7w8BksWSznHetinxQ=; b=IKEj1z9OqX42wh v9hDO7z2xmKtVk6mjvyvwQZKisOO84R6MaWIC4NwAiGEjJVn9+usowfsPqCwQB0XpqlPwq9fR8GlZ 4fLJYSR84oXkO2qXeSZyhCifod4fHxhw68Zr0TH2nwIKLo29K4GoKVCJEJ861WJZJpLabyO+Ap3dr zGM4v+5C7pbuIzY0DfvFHP/40Pdbi6GnzNhsU9KxUdj1z9pyzTliSdoxnUkvpX3Q93oNmDkccfWg+ AekUW7attn6oY+gFGlMU9HtB/6eC0TMhtOHho2TrOmejkV/h7nygbyelA2zJQaKXdGzQa7OB+/avp sd/39amFeT2y+OdSC1NA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1pcuvs-0000eN-1m; Thu, 16 Mar 2023 21:14:44 +0000 Received: from out-37.mta1.migadu.com ([2001:41d0:203:375::25]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1pcuvk-0000ad-2a for linux-arm-kernel@lists.infradead.org; Thu, 16 Mar 2023 21:14:39 +0000 X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1679001273; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=xhgnOJEosH98wdoXReR9wJiedx7z0eEZV5vpcQvw08E=; b=iDbC9HZzNWdsKhHOdvki9BYBYAVWsMLr1ci6nNZXaI5+4F95T7AGmAvFl9zqdgRs3hDOH8 tEj/bid2ED5rQevZ0nsMgMZJcSCbYlTP17Nb8BwypxeEElFZIDwhYnvgAEEDpg3QXumsER 3Ugoy53xZ6b1faOad4gZ5GrW9mv9e6A= From: Oliver Upton To: Marc Zyngier Cc: James Morse , Suzuki K Poulose , kvmarm@lists.linux.dev, Zenghui Yu , linux-arm-kernel@lists.infradead.org, Sean Christopherson , Oliver Upton Subject: [PATCH v2 4/4] KVM: arm64: Use config_lock to protect vgic state Date: Thu, 16 Mar 2023 21:14:12 +0000 Message-Id: <20230316211412.2651555-5-oliver.upton@linux.dev> In-Reply-To: <20230316211412.2651555-1-oliver.upton@linux.dev> References: <20230316211412.2651555-1-oliver.upton@linux.dev> MIME-Version: 1.0 X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230316_141437_128349_BF0A48AB X-CRM114-Status: GOOD ( 22.10 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Almost all of the vgic state is VM-scoped but accessed from the context of a vCPU. These accesses were serialized on the kvm->lock which cannot be nested within a vcpu->mutex critical section. Move over the vgic state to using the config_lock. Tweak the lock ordering where necessary to ensure that the config_lock is acquired after the vcpu->mutex. Acquire the config_lock in kvm_vgic_create() to avoid a race between the converted flows and GIC creation. Signed-off-by: Oliver Upton --- arch/arm64/kvm/vgic/vgic-debug.c | 8 ++-- arch/arm64/kvm/vgic/vgic-init.c | 33 ++++++++++------- arch/arm64/kvm/vgic/vgic-its.c | 29 ++++++--------- arch/arm64/kvm/vgic/vgic-kvm-device.c | 53 ++++++++++++--------------- arch/arm64/kvm/vgic/vgic-mmio-v3.c | 4 +- arch/arm64/kvm/vgic/vgic-mmio.c | 12 +++--- arch/arm64/kvm/vgic/vgic-v4.c | 11 +++--- arch/arm64/kvm/vgic/vgic.c | 2 +- 8 files changed, 75 insertions(+), 77 deletions(-) diff --git a/arch/arm64/kvm/vgic/vgic-debug.c b/arch/arm64/kvm/vgic/vgic-debug.c index 78cde687383c..07aa0437125a 100644 --- a/arch/arm64/kvm/vgic/vgic-debug.c +++ b/arch/arm64/kvm/vgic/vgic-debug.c @@ -85,7 +85,7 @@ static void *vgic_debug_start(struct seq_file *s, loff_t *pos) struct kvm *kvm = s->private; struct vgic_state_iter *iter; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); iter = kvm->arch.vgic.iter; if (iter) { iter = ERR_PTR(-EBUSY); @@ -104,7 +104,7 @@ static void *vgic_debug_start(struct seq_file *s, loff_t *pos) if (end_of_vgic(iter)) iter = NULL; out: - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); return iter; } @@ -132,12 +132,12 @@ static void vgic_debug_stop(struct seq_file *s, void *v) if (IS_ERR(v)) return; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); iter = kvm->arch.vgic.iter; kfree(iter->lpi_array); kfree(iter); kvm->arch.vgic.iter = NULL; - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); } static void print_dist_state(struct seq_file *s, struct vgic_dist *dist) diff --git a/arch/arm64/kvm/vgic/vgic-init.c b/arch/arm64/kvm/vgic/vgic-init.c index cd134db41a57..b1690063e17d 100644 --- a/arch/arm64/kvm/vgic/vgic-init.c +++ b/arch/arm64/kvm/vgic/vgic-init.c @@ -74,9 +74,6 @@ int kvm_vgic_create(struct kvm *kvm, u32 type) unsigned long i; int ret; - if (irqchip_in_kernel(kvm)) - return -EEXIST; - /* * This function is also called by the KVM_CREATE_IRQCHIP handler, * which had no chance yet to check the availability of the GICv2 @@ -91,6 +88,13 @@ int kvm_vgic_create(struct kvm *kvm, u32 type) if (!lock_all_vcpus(kvm)) return ret; + mutex_lock(&kvm->arch.config_lock); + + if (irqchip_in_kernel(kvm)) { + ret = -EEXIST; + goto out_unlock; + } + kvm_for_each_vcpu(i, vcpu, kvm) { if (vcpu_has_run_once(vcpu)) goto out_unlock; @@ -118,6 +122,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type) INIT_LIST_HEAD(&kvm->arch.vgic.rd_regions); out_unlock: + mutex_unlock(&kvm->arch.config_lock); unlock_all_vcpus(kvm); return ret; } @@ -227,9 +232,9 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu) * KVM io device for the redistributor that belongs to this VCPU. */ if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V3) { - mutex_lock(&vcpu->kvm->lock); + mutex_lock(&vcpu->kvm->arch.config_lock); ret = vgic_register_redist_iodev(vcpu); - mutex_unlock(&vcpu->kvm->lock); + mutex_unlock(&vcpu->kvm->arch.config_lock); } return ret; } @@ -250,7 +255,6 @@ static void kvm_vgic_vcpu_enable(struct kvm_vcpu *vcpu) * The function is generally called when nr_spis has been explicitly set * by the guest through the KVM DEVICE API. If not nr_spis is set to 256. * vgic_initialized() returns true when this function has succeeded. - * Must be called with kvm->lock held! */ int vgic_init(struct kvm *kvm) { @@ -259,6 +263,8 @@ int vgic_init(struct kvm *kvm) int ret = 0, i; unsigned long idx; + lockdep_assert_held(&kvm->arch.config_lock); + if (vgic_initialized(kvm)) return 0; @@ -373,12 +379,13 @@ void kvm_vgic_vcpu_destroy(struct kvm_vcpu *vcpu) vgic_cpu->rd_iodev.base_addr = VGIC_ADDR_UNDEF; } -/* To be called with kvm->lock held */ static void __kvm_vgic_destroy(struct kvm *kvm) { struct kvm_vcpu *vcpu; unsigned long i; + lockdep_assert_held(&kvm->arch.config_lock); + vgic_debug_destroy(kvm); kvm_for_each_vcpu(i, vcpu, kvm) @@ -389,9 +396,9 @@ static void __kvm_vgic_destroy(struct kvm *kvm) void kvm_vgic_destroy(struct kvm *kvm) { - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); __kvm_vgic_destroy(kvm); - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); } /** @@ -414,9 +421,9 @@ int vgic_lazy_init(struct kvm *kvm) if (kvm->arch.vgic.vgic_model != KVM_DEV_TYPE_ARM_VGIC_V2) return -EBUSY; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); ret = vgic_init(kvm); - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); } return ret; @@ -441,7 +448,7 @@ int kvm_vgic_map_resources(struct kvm *kvm) if (likely(vgic_ready(kvm))) return 0; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); if (vgic_ready(kvm)) goto out; @@ -459,7 +466,7 @@ int kvm_vgic_map_resources(struct kvm *kvm) dist->ready = true; out: - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); return ret; } diff --git a/arch/arm64/kvm/vgic/vgic-its.c b/arch/arm64/kvm/vgic/vgic-its.c index 2642e9ce2819..ca55065102e7 100644 --- a/arch/arm64/kvm/vgic/vgic-its.c +++ b/arch/arm64/kvm/vgic/vgic-its.c @@ -2043,7 +2043,10 @@ static int vgic_its_attr_regs_access(struct kvm_device *dev, if (offset & align) return -EINVAL; - mutex_lock(&dev->kvm->lock); + if (!lock_all_vcpus(dev->kvm)) + return -EBUSY; + + mutex_lock(&dev->kvm->arch.config_lock); if (IS_VGIC_ADDR_UNDEF(its->vgic_its_base)) { ret = -ENXIO; @@ -2058,11 +2061,6 @@ static int vgic_its_attr_regs_access(struct kvm_device *dev, goto out; } - if (!lock_all_vcpus(dev->kvm)) { - ret = -EBUSY; - goto out; - } - addr = its->vgic_its_base + offset; len = region->access_flags & VGIC_ACCESS_64bit ? 8 : 4; @@ -2076,9 +2074,9 @@ static int vgic_its_attr_regs_access(struct kvm_device *dev, } else { *reg = region->its_read(dev->kvm, its, addr, len); } - unlock_all_vcpus(dev->kvm); out: - mutex_unlock(&dev->kvm->lock); + mutex_unlock(&dev->kvm->arch.config_lock); + unlock_all_vcpus(dev->kvm); return ret; } @@ -2748,14 +2746,11 @@ static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr) if (attr == KVM_DEV_ARM_VGIC_CTRL_INIT) /* Nothing to do */ return 0; - mutex_lock(&kvm->lock); - mutex_lock(&its->its_lock); - - if (!lock_all_vcpus(kvm)) { - mutex_unlock(&its->its_lock); - mutex_unlock(&kvm->lock); + if (!lock_all_vcpus(kvm)) return -EBUSY; - } + + mutex_lock(&kvm->arch.config_lock); + mutex_lock(&its->its_lock); switch (attr) { case KVM_DEV_ARM_ITS_CTRL_RESET: @@ -2769,9 +2764,9 @@ static int vgic_its_ctrl(struct kvm *kvm, struct vgic_its *its, u64 attr) break; } - unlock_all_vcpus(kvm); mutex_unlock(&its->its_lock); - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); + unlock_all_vcpus(kvm); return ret; } diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c index edeac2380591..d5f8a81d6a92 100644 --- a/arch/arm64/kvm/vgic/vgic-kvm-device.c +++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c @@ -46,7 +46,7 @@ int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev struct vgic_dist *vgic = &kvm->arch.vgic; int r; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); switch (FIELD_GET(KVM_ARM_DEVICE_TYPE_MASK, dev_addr->id)) { case KVM_VGIC_V2_ADDR_TYPE_DIST: r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); @@ -68,7 +68,7 @@ int kvm_set_legacy_vgic_v2_addr(struct kvm *kvm, struct kvm_arm_device_addr *dev r = -ENODEV; } - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); return r; } @@ -102,7 +102,7 @@ static int kvm_vgic_addr(struct kvm *kvm, struct kvm_device_attr *attr, bool wri if (get_user(addr, uaddr)) return -EFAULT; - mutex_lock(&kvm->lock); + mutex_lock(&kvm->arch.config_lock); switch (attr->attr) { case KVM_VGIC_V2_ADDR_TYPE_DIST: r = vgic_check_type(kvm, KVM_DEV_TYPE_ARM_VGIC_V2); @@ -191,7 +191,7 @@ static int kvm_vgic_addr(struct kvm *kvm, struct kvm_device_attr *attr, bool wri } out: - mutex_unlock(&kvm->lock); + mutex_unlock(&kvm->arch.config_lock); if (!r && !write) r = put_user(addr, uaddr); @@ -227,7 +227,7 @@ static int vgic_set_common_attr(struct kvm_device *dev, (val & 31)) return -EINVAL; - mutex_lock(&dev->kvm->lock); + mutex_lock(&dev->kvm->arch.config_lock); if (vgic_ready(dev->kvm) || dev->kvm->arch.vgic.nr_spis) ret = -EBUSY; @@ -235,16 +235,16 @@ static int vgic_set_common_attr(struct kvm_device *dev, dev->kvm->arch.vgic.nr_spis = val - VGIC_NR_PRIVATE_IRQS; - mutex_unlock(&dev->kvm->lock); + mutex_unlock(&dev->kvm->arch.config_lock); return ret; } case KVM_DEV_ARM_VGIC_GRP_CTRL: { switch (attr->attr) { case KVM_DEV_ARM_VGIC_CTRL_INIT: - mutex_lock(&dev->kvm->lock); + mutex_lock(&dev->kvm->arch.config_lock); r = vgic_init(dev->kvm); - mutex_unlock(&dev->kvm->lock); + mutex_unlock(&dev->kvm->arch.config_lock); return r; case KVM_DEV_ARM_VGIC_SAVE_PENDING_TABLES: /* @@ -254,15 +254,14 @@ static int vgic_set_common_attr(struct kvm_device *dev, */ if (vgic_check_type(dev->kvm, KVM_DEV_TYPE_ARM_VGIC_V3)) return -ENXIO; - mutex_lock(&dev->kvm->lock); - if (!lock_all_vcpus(dev->kvm)) { - mutex_unlock(&dev->kvm->lock); + if (!lock_all_vcpus(dev->kvm)) return -EBUSY; - } + + mutex_lock(&dev->kvm->arch.config_lock); r = vgic_v3_save_pending_tables(dev->kvm); + mutex_unlock(&dev->kvm->arch.config_lock); unlock_all_vcpus(dev->kvm); - mutex_unlock(&dev->kvm->lock); return r; } break; @@ -409,17 +408,15 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev, if (get_user(val, uaddr)) return -EFAULT; - mutex_lock(&dev->kvm->lock); + if (!lock_all_vcpus(dev->kvm)) + return -EBUSY; + + mutex_lock(&dev->kvm->arch.config_lock); ret = vgic_init(dev->kvm); if (ret) goto out; - if (!lock_all_vcpus(dev->kvm)) { - ret = -EBUSY; - goto out; - } - switch (attr->group) { case KVM_DEV_ARM_VGIC_GRP_CPU_REGS: ret = vgic_v2_cpuif_uaccess(vcpu, is_write, addr, &val); @@ -432,9 +429,9 @@ static int vgic_v2_attr_regs_access(struct kvm_device *dev, break; } - unlock_all_vcpus(dev->kvm); out: - mutex_unlock(&dev->kvm->lock); + mutex_unlock(&dev->kvm->arch.config_lock); + unlock_all_vcpus(dev->kvm); if (!ret && !is_write) ret = put_user(val, uaddr); @@ -567,14 +564,12 @@ static int vgic_v3_attr_regs_access(struct kvm_device *dev, return -EFAULT; } - mutex_lock(&dev->kvm->lock); + if (!lock_all_vcpus(dev->kvm)) + return -EBUSY; - if (unlikely(!vgic_initialized(dev->kvm))) { - ret = -EBUSY; - goto out; - } + mutex_lock(&dev->kvm->arch.config_lock); - if (!lock_all_vcpus(dev->kvm)) { + if (unlikely(!vgic_initialized(dev->kvm))) { ret = -EBUSY; goto out; } @@ -609,9 +604,9 @@ static int vgic_v3_attr_regs_access(struct kvm_device *dev, break; } - unlock_all_vcpus(dev->kvm); out: - mutex_unlock(&dev->kvm->lock); + mutex_unlock(&dev->kvm->arch.config_lock); + unlock_all_vcpus(dev->kvm); if (!ret && uaccess && !is_write) { u32 __user *uaddr = (u32 __user *)(unsigned long)attr->addr; diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c index 91201f743033..472b18ac92a2 100644 --- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c +++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c @@ -111,7 +111,7 @@ static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu, case GICD_CTLR: { bool was_enabled, is_hwsgi; - mutex_lock(&vcpu->kvm->lock); + mutex_lock(&vcpu->kvm->arch.config_lock); was_enabled = dist->enabled; is_hwsgi = dist->nassgireq; @@ -139,7 +139,7 @@ static void vgic_mmio_write_v3_misc(struct kvm_vcpu *vcpu, else if (!was_enabled && dist->enabled) vgic_kick_vcpus(vcpu->kvm); - mutex_unlock(&vcpu->kvm->lock); + mutex_unlock(&vcpu->kvm->arch.config_lock); break; } case GICD_TYPER: diff --git a/arch/arm64/kvm/vgic/vgic-mmio.c b/arch/arm64/kvm/vgic/vgic-mmio.c index e67b3b2c8044..1939c94e0b24 100644 --- a/arch/arm64/kvm/vgic/vgic-mmio.c +++ b/arch/arm64/kvm/vgic/vgic-mmio.c @@ -530,13 +530,13 @@ unsigned long vgic_mmio_read_active(struct kvm_vcpu *vcpu, u32 intid = VGIC_ADDR_TO_INTID(addr, 1); u32 val; - mutex_lock(&vcpu->kvm->lock); + mutex_lock(&vcpu->kvm->arch.config_lock); vgic_access_active_prepare(vcpu, intid); val = __vgic_mmio_read_active(vcpu, addr, len); vgic_access_active_finish(vcpu, intid); - mutex_unlock(&vcpu->kvm->lock); + mutex_unlock(&vcpu->kvm->arch.config_lock); return val; } @@ -625,13 +625,13 @@ void vgic_mmio_write_cactive(struct kvm_vcpu *vcpu, { u32 intid = VGIC_ADDR_TO_INTID(addr, 1); - mutex_lock(&vcpu->kvm->lock); + mutex_lock(&vcpu->kvm->arch.config_lock); vgic_access_active_prepare(vcpu, intid); __vgic_mmio_write_cactive(vcpu, addr, len, val); vgic_access_active_finish(vcpu, intid); - mutex_unlock(&vcpu->kvm->lock); + mutex_unlock(&vcpu->kvm->arch.config_lock); } int vgic_mmio_uaccess_write_cactive(struct kvm_vcpu *vcpu, @@ -662,13 +662,13 @@ void vgic_mmio_write_sactive(struct kvm_vcpu *vcpu, { u32 intid = VGIC_ADDR_TO_INTID(addr, 1); - mutex_lock(&vcpu->kvm->lock); + mutex_lock(&vcpu->kvm->arch.config_lock); vgic_access_active_prepare(vcpu, intid); __vgic_mmio_write_sactive(vcpu, addr, len, val); vgic_access_active_finish(vcpu, intid); - mutex_unlock(&vcpu->kvm->lock); + mutex_unlock(&vcpu->kvm->arch.config_lock); } int vgic_mmio_uaccess_write_sactive(struct kvm_vcpu *vcpu, diff --git a/arch/arm64/kvm/vgic/vgic-v4.c b/arch/arm64/kvm/vgic/vgic-v4.c index a413718be92b..3bb003478060 100644 --- a/arch/arm64/kvm/vgic/vgic-v4.c +++ b/arch/arm64/kvm/vgic/vgic-v4.c @@ -232,9 +232,8 @@ int vgic_v4_request_vpe_irq(struct kvm_vcpu *vcpu, int irq) * @kvm: Pointer to the VM being initialized * * We may be called each time a vITS is created, or when the - * vgic is initialized. This relies on kvm->lock to be - * held. In both cases, the number of vcpus should now be - * fixed. + * vgic is initialized. In both cases, the number of vcpus + * should now be fixed. */ int vgic_v4_init(struct kvm *kvm) { @@ -243,6 +242,8 @@ int vgic_v4_init(struct kvm *kvm) int nr_vcpus, ret; unsigned long i; + lockdep_assert_held(&kvm->arch.config_lock); + if (!kvm_vgic_global_state.has_gicv4) return 0; /* Nothing to see here... move along. */ @@ -309,14 +310,14 @@ int vgic_v4_init(struct kvm *kvm) /** * vgic_v4_teardown - Free the GICv4 data structures * @kvm: Pointer to the VM being destroyed - * - * Relies on kvm->lock to be held. */ void vgic_v4_teardown(struct kvm *kvm) { struct its_vm *its_vm = &kvm->arch.vgic.its_vm; int i; + lockdep_assert_held(&kvm->arch.config_lock); + if (!its_vm->vpes) return; diff --git a/arch/arm64/kvm/vgic/vgic.c b/arch/arm64/kvm/vgic/vgic.c index d97e6080b421..afea64f60086 100644 --- a/arch/arm64/kvm/vgic/vgic.c +++ b/arch/arm64/kvm/vgic/vgic.c @@ -23,7 +23,7 @@ struct vgic_global kvm_vgic_global_state __ro_after_init = { /* * Locking order is always: - * kvm->lock (mutex) + * kvm->arch.config_lock (mutex) * its->cmd_lock (mutex) * its->its_lock (mutex) * vgic_cpu->ap_list_lock must be taken with IRQs disabled