From: Marc Zyngier <marc.zyngier@arm.com>
To: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: Suzuki K Poulose <suzuki.poulose@arm.com>,
"Raslan, KarimAllah" <karahmed@amazon.de>,
Julien Thierry <julien.thierry@arm.com>,
Christoffer Dall <christoffer.dall@arm.com>,
Eric Auger <eric.auger@redhat.com>,
James Morse <james.morse@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>,
"Saidi, Ali" <alisaidi@amazon.com>
Subject: [PATCH v2 2/9] KVM: arm/arm64: vgic: Add __vgic_put_lpi_locked primitive
Date: Tue, 11 Jun 2019 18:03:29 +0100 [thread overview]
Message-ID: <20190611170336.121706-3-marc.zyngier@arm.com> (raw)
In-Reply-To: <20190611170336.121706-1-marc.zyngier@arm.com>
Our LPI translation cache needs to be able to drop the refcount
on an LPI whilst already holding the lpi_list_lock.
Let's add a new primitive for this.
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
virt/kvm/arm/vgic/vgic.c | 26 +++++++++++++++++---------
virt/kvm/arm/vgic/vgic.h | 1 +
2 files changed, 18 insertions(+), 9 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c
index 191deccf60bf..376a297e2169 100644
--- a/virt/kvm/arm/vgic/vgic.c
+++ b/virt/kvm/arm/vgic/vgic.c
@@ -130,6 +130,22 @@ static void vgic_irq_release(struct kref *ref)
{
}
+/*
+ * Drop the refcount on the LPI. Must be called with lpi_list_lock held.
+ */
+void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+
+ if (!kref_put(&irq->refcount, vgic_irq_release))
+ return;
+
+ list_del(&irq->lpi_list);
+ dist->lpi_list_count--;
+
+ kfree(irq);
+}
+
void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
{
struct vgic_dist *dist = &kvm->arch.vgic;
@@ -139,16 +155,8 @@ void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq)
return;
raw_spin_lock_irqsave(&dist->lpi_list_lock, flags);
- if (!kref_put(&irq->refcount, vgic_irq_release)) {
- raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
- return;
- };
-
- list_del(&irq->lpi_list);
- dist->lpi_list_count--;
+ __vgic_put_lpi_locked(kvm, irq);
raw_spin_unlock_irqrestore(&dist->lpi_list_lock, flags);
-
- kfree(irq);
}
void vgic_flush_pending_lpis(struct kvm_vcpu *vcpu)
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 50aad705c4a9..afac2fed7df4 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -172,6 +172,7 @@ vgic_get_mmio_region(struct kvm_vcpu *vcpu, struct vgic_io_device *iodev,
gpa_t addr, int len);
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
u32 intid);
+void __vgic_put_lpi_locked(struct kvm *kvm, struct vgic_irq *irq);
void vgic_put_irq(struct kvm *kvm, struct vgic_irq *irq);
bool vgic_get_phys_line_level(struct vgic_irq *irq);
void vgic_irq_set_phys_pending(struct vgic_irq *irq, bool pending);
--
2.20.1
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next prev parent reply other threads:[~2019-06-11 17:04 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-11 17:03 [PATCH v2 0/9] KVM: arm/arm64: vgic: ITS translation cache Marc Zyngier
2019-06-11 17:03 ` [PATCH v2 1/9] KVM: arm/arm64: vgic: Add LPI translation cache definition Marc Zyngier
2019-06-12 8:16 ` Julien Thierry
2019-06-12 8:49 ` Julien Thierry
2019-06-12 9:52 ` Marc Zyngier
2019-06-12 10:58 ` Julien Thierry
2019-06-12 12:28 ` Julien Thierry
2019-07-23 12:43 ` Auger Eric
2019-06-11 17:03 ` Marc Zyngier [this message]
2019-06-11 17:03 ` [PATCH v2 3/9] KVM: arm/arm64: vgic-its: Add MSI-LPI translation cache invalidation Marc Zyngier
2019-07-23 12:39 ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 4/9] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on specific commands Marc Zyngier
2019-07-01 12:38 ` Auger Eric
2019-07-22 10:54 ` Marc Zyngier
2019-07-23 12:25 ` Auger Eric
2019-07-23 12:43 ` Marc Zyngier
2019-07-23 12:47 ` Auger Eric
2019-07-23 12:50 ` Marc Zyngier
2019-06-11 17:03 ` [PATCH v2 5/9] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on disabling LPIs Marc Zyngier
2019-07-23 15:09 ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 6/9] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on vgic teardown Marc Zyngier
2019-07-23 15:10 ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 7/9] KVM: arm/arm64: vgic-its: Cache successful MSI->LPI translation Marc Zyngier
2019-06-25 11:50 ` Zenghui Yu
2019-06-25 12:31 ` Marc Zyngier
2019-06-25 16:00 ` Zenghui Yu
2019-06-26 3:54 ` Zenghui Yu
2019-06-26 7:55 ` Marc Zyngier
2019-07-23 15:21 ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 8/9] KVM: arm/arm64: vgic-its: Check the LPI translation cache on MSI injection Marc Zyngier
2019-07-23 15:10 ` Auger Eric
2019-07-23 15:45 ` Marc Zyngier
2019-07-24 7:41 ` Auger Eric
2019-06-11 17:03 ` [PATCH v2 9/9] KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic Marc Zyngier
2019-07-23 15:14 ` Auger Eric
2019-07-25 8:24 ` Marc Zyngier
2019-07-23 11:14 ` [PATCH v2 0/9] KVM: arm/arm64: vgic: ITS translation cache Andre Przywara
2019-07-25 8:50 ` Marc Zyngier
2019-07-25 10:01 ` Andre Przywara
2019-07-25 15:37 ` Marc Zyngier
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