From: Marc Zyngier <marc.zyngier@arm.com>
To: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>
Cc: kvm@vger.kernel.org,
Richard Henderson <richard.henderson@linaro.org>,
Masami Hiramatsu <mhiramat@kernel.org>,
kvmarm@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH 03/11] KVM: arm/arm64: vgic: Make vgic_cpu->ap_list_lock a raw_spinlock
Date: Thu, 7 Feb 2019 13:18:35 +0000 [thread overview]
Message-ID: <20190207131843.157210-4-marc.zyngier@arm.com> (raw)
In-Reply-To: <20190207131843.157210-1-marc.zyngier@arm.com>
From: Julien Thierry <julien.thierry@arm.com>
vgic_cpu->ap_list_lock must always be taken with interrupts disabled as
it is used in interrupt context.
For configurations such as PREEMPT_RT_FULL, this means that it should
be a raw_spinlock since RT spinlocks are interruptible.
Signed-off-by: Julien Thierry <julien.thierry@arm.com>
Acked-by: Christoffer Dall <christoffer.dall@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
---
include/kvm/arm_vgic.h | 2 +-
virt/kvm/arm/vgic/vgic-init.c | 2 +-
virt/kvm/arm/vgic/vgic.c | 37 ++++++++++++++++++-----------------
3 files changed, 21 insertions(+), 20 deletions(-)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 32954e115796..c36c86f1ec9a 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -307,7 +307,7 @@ struct vgic_cpu {
unsigned int used_lrs;
struct vgic_irq private_irqs[VGIC_NR_PRIVATE_IRQS];
- spinlock_t ap_list_lock; /* Protects the ap_list */
+ raw_spinlock_t ap_list_lock; /* Protects the ap_list */
/*
* List of IRQs that this VCPU should consider because they are either
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 330c1ada7326..dfbfcb1fe933 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -206,7 +206,7 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
vgic_cpu->sgi_iodev.base_addr = VGIC_ADDR_UNDEF;
INIT_LIST_HEAD(&vgic_cpu->ap_list_head);
- spin_lock_init(&vgic_cpu->ap_list_lock);
+ raw_spin_lock_init(&vgic_cpu->ap_list_lock);
/*
* Enable and configure all SGIs to be edge-triggered and
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index ea54a1923c4f..abd9c7352677 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -54,11 +54,11 @@ struct vgic_global kvm_vgic_global_state __ro_after_init = {
* When taking more than one ap_list_lock at the same time, always take the
* lowest numbered VCPU's ap_list_lock first, so:
* vcpuX->vcpu_id < vcpuY->vcpu_id:
- * spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
- * spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
+ * raw_spin_lock(vcpuX->arch.vgic_cpu.ap_list_lock);
+ * raw_spin_lock(vcpuY->arch.vgic_cpu.ap_list_lock);
*
* Since the VGIC must support injecting virtual interrupts from ISRs, we have
- * to use the spin_lock_irqsave/spin_unlock_irqrestore versions of outer
+ * to use the raw_spin_lock_irqsave/raw_spin_unlock_irqrestore versions of outer
* spinlocks for any lock that may be taken while injecting an interrupt.
*/
@@ -351,7 +351,7 @@ bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
/* someone can do stuff here, which we re-check below */
- spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+ raw_spin_lock_irqsave(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
raw_spin_lock(&irq->irq_lock);
/*
@@ -368,7 +368,8 @@ bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
if (unlikely(irq->vcpu || vcpu != vgic_target_oracle(irq))) {
raw_spin_unlock(&irq->irq_lock);
- spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+ raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock,
+ flags);
raw_spin_lock_irqsave(&irq->irq_lock, flags);
goto retry;
@@ -383,7 +384,7 @@ bool vgic_queue_irq_unlock(struct kvm *kvm, struct vgic_irq *irq,
irq->vcpu = vcpu;
raw_spin_unlock(&irq->irq_lock);
- spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
+ raw_spin_unlock_irqrestore(&vcpu->arch.vgic_cpu.ap_list_lock, flags);
kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu);
kvm_vcpu_kick(vcpu);
@@ -597,7 +598,7 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
retry:
- spin_lock(&vgic_cpu->ap_list_lock);
+ raw_spin_lock(&vgic_cpu->ap_list_lock);
list_for_each_entry_safe(irq, tmp, &vgic_cpu->ap_list_head, ap_list) {
struct kvm_vcpu *target_vcpu, *vcpuA, *vcpuB;
@@ -638,7 +639,7 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
/* This interrupt looks like it has to be migrated. */
raw_spin_unlock(&irq->irq_lock);
- spin_unlock(&vgic_cpu->ap_list_lock);
+ raw_spin_unlock(&vgic_cpu->ap_list_lock);
/*
* Ensure locking order by always locking the smallest
@@ -652,9 +653,9 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
vcpuB = vcpu;
}
- spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
- spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
- SINGLE_DEPTH_NESTING);
+ raw_spin_lock(&vcpuA->arch.vgic_cpu.ap_list_lock);
+ raw_spin_lock_nested(&vcpuB->arch.vgic_cpu.ap_list_lock,
+ SINGLE_DEPTH_NESTING);
raw_spin_lock(&irq->irq_lock);
/*
@@ -676,8 +677,8 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
}
raw_spin_unlock(&irq->irq_lock);
- spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
- spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
+ raw_spin_unlock(&vcpuB->arch.vgic_cpu.ap_list_lock);
+ raw_spin_unlock(&vcpuA->arch.vgic_cpu.ap_list_lock);
if (target_vcpu_needs_kick) {
kvm_make_request(KVM_REQ_IRQ_PENDING, target_vcpu);
@@ -687,7 +688,7 @@ static void vgic_prune_ap_list(struct kvm_vcpu *vcpu)
goto retry;
}
- spin_unlock(&vgic_cpu->ap_list_lock);
+ raw_spin_unlock(&vgic_cpu->ap_list_lock);
}
static inline void vgic_fold_lr_state(struct kvm_vcpu *vcpu)
@@ -872,9 +873,9 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu)
DEBUG_SPINLOCK_BUG_ON(!irqs_disabled());
- spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
+ raw_spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock);
vgic_flush_lr_state(vcpu);
- spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
+ raw_spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock);
if (can_access_vgic_from_kernel())
vgic_restore_state(vcpu);
@@ -918,7 +919,7 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
vgic_get_vmcr(vcpu, &vmcr);
- spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
+ raw_spin_lock_irqsave(&vgic_cpu->ap_list_lock, flags);
list_for_each_entry(irq, &vgic_cpu->ap_list_head, ap_list) {
raw_spin_lock(&irq->irq_lock);
@@ -931,7 +932,7 @@ int kvm_vgic_vcpu_pending_irq(struct kvm_vcpu *vcpu)
break;
}
- spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
+ raw_spin_unlock_irqrestore(&vgic_cpu->ap_list_lock, flags);
return pending;
}
--
2.20.1
next prev parent reply other threads:[~2019-02-07 13:18 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-07 13:18 [GIT PULL] KVM/ARM updates for 5.0-rc6 Marc Zyngier
2019-02-07 13:18 ` [PATCH 01/11] KVM: arm/arm64: vgic: Make vgic_irq->irq_lock a raw_spinlock Marc Zyngier
2019-02-07 13:18 ` [PATCH 02/11] KVM: arm/arm64: vgic: Make vgic_dist->lpi_list_lock " Marc Zyngier
2019-02-07 13:18 ` Marc Zyngier [this message]
2019-02-07 13:18 ` [PATCH 04/11] arm64: KVM: Don't generate UNDEF when LORegion feature is present Marc Zyngier
2019-02-07 13:18 ` [PATCH 05/11] KVM: arm/arm64: Reset the VCPU without preemption and vcpu state loaded Marc Zyngier
2019-03-04 16:30 ` Julien Grall
2019-03-04 17:06 ` Marc Zyngier
2019-03-04 17:31 ` Julien Grall
2019-03-04 17:37 ` Marc Zyngier
2019-02-07 13:18 ` [PATCH 06/11] arm/arm64: KVM: Allow a VCPU to fully reset itself Marc Zyngier
2019-02-07 13:18 ` [PATCH 07/11] arm/arm64: KVM: Don't panic on failure to properly reset system registers Marc Zyngier
2019-02-07 13:18 ` [PATCH 08/11] KVM: arm/arm64: vgic: Always initialize the group of private IRQs Marc Zyngier
2019-02-07 13:18 ` [PATCH 09/11] arm: KVM: Add missing kvm_stage2_has_pmd() helper Marc Zyngier
2019-02-07 13:18 ` [PATCH 10/11] KVM: arm64: Relax the restriction on using stage2 PUD huge mapping Marc Zyngier
2019-02-07 13:18 ` [PATCH 11/11] KVM: arm64: Forbid kprobing of the VHE world-switch code Marc Zyngier
2019-02-13 18:39 ` [GIT PULL] KVM/ARM updates for 5.0-rc6 Paolo Bonzini
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