From: Marc Zyngier <marc.zyngier@arm.com>
To: linux-arm-kernel@lists.infradead.org,
kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org
Cc: "Raslan, KarimAllah" <karahmed@amazon.de>
Subject: [PATCH 1/8] KVM: arm/arm64: vgic: Add LPI translation cache definition
Date: Thu, 6 Jun 2019 17:54:48 +0100 [thread overview]
Message-ID: <20190606165455.162478-2-marc.zyngier@arm.com> (raw)
In-Reply-To: <20190606165455.162478-1-marc.zyngier@arm.com>
Add the basic data structure that expresses an MSI to LPI
translation as well as the allocation/release hooks.
THe size of the cache is arbitrarily defined as 4*nr_vcpus.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
include/kvm/arm_vgic.h | 10 ++++++++++
virt/kvm/arm/vgic/vgic-init.c | 34 ++++++++++++++++++++++++++++++++++
virt/kvm/arm/vgic/vgic-its.c | 2 ++
virt/kvm/arm/vgic/vgic.h | 3 +++
4 files changed, 49 insertions(+)
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index c36c86f1ec9a..5a0d6b07c5ef 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -173,6 +173,14 @@ struct vgic_io_device {
struct kvm_io_device dev;
};
+struct vgic_translation_cache_entry {
+ struct list_head entry;
+ phys_addr_t db;
+ u32 devid;
+ u32 eventid;
+ struct vgic_irq *irq;
+};
+
struct vgic_its {
/* The base address of the ITS control register frame */
gpa_t vgic_its_base;
@@ -260,6 +268,8 @@ struct vgic_dist {
struct list_head lpi_list_head;
int lpi_list_count;
+ struct list_head lpi_translation_cache;
+
/* used by vgic-debug */
struct vgic_state_iter *iter;
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 3bdb31eaed64..25ae25694a28 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -64,6 +64,7 @@ void kvm_vgic_early_init(struct kvm *kvm)
struct vgic_dist *dist = &kvm->arch.vgic;
INIT_LIST_HEAD(&dist->lpi_list_head);
+ INIT_LIST_HEAD(&dist->lpi_translation_cache);
raw_spin_lock_init(&dist->lpi_list_lock);
}
@@ -260,6 +261,27 @@ static void kvm_vgic_vcpu_enable(struct kvm_vcpu *vcpu)
vgic_v3_enable(vcpu);
}
+void vgic_lpi_translation_cache_init(struct kvm *kvm)
+{
+ struct vgic_dist *dist = &kvm->arch.vgic;
+ int i;
+
+ if (!list_empty(&dist->lpi_translation_cache))
+ return;
+
+ for (i = 0; i < LPI_CACHE_SIZE(kvm); i++) {
+ struct vgic_translation_cache_entry *cte;
+
+ /* An allocation failure is not fatal */
+ cte = kzalloc(sizeof(*cte), GFP_KERNEL);
+ if (WARN_ON(!cte))
+ break;
+
+ INIT_LIST_HEAD(&cte->entry);
+ list_add(&cte->entry, &dist->lpi_translation_cache);
+ }
+}
+
/*
* vgic_init: allocates and initializes dist and vcpu data structures
* depending on two dimensioning parameters:
@@ -305,6 +327,7 @@ int vgic_init(struct kvm *kvm)
}
if (vgic_has_its(kvm)) {
+ vgic_lpi_translation_cache_init(kvm);
ret = vgic_v4_init(kvm);
if (ret)
goto out;
@@ -346,6 +369,17 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
INIT_LIST_HEAD(&dist->rd_regions);
}
+ if (vgic_has_its(kvm)) {
+ struct vgic_translation_cache_entry *cte, *tmp;
+
+ list_for_each_entry_safe(cte, tmp,
+ &dist->lpi_translation_cache, entry) {
+ list_del(&cte->entry);
+ kfree(cte);
+ }
+ INIT_LIST_HEAD(&dist->lpi_translation_cache);
+ }
+
if (vgic_supports_direct_msis(kvm))
vgic_v4_teardown(kvm);
}
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 44ceaccb18cf..5758504fd934 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -1696,6 +1696,8 @@ static int vgic_its_create(struct kvm_device *dev, u32 type)
kfree(its);
return ret;
}
+
+ vgic_lpi_translation_cache_init(dev->kvm);
}
mutex_init(&its->its_lock);
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index abeeffabc456..a58e1b263dca 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -316,6 +316,9 @@ int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr);
int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
u32 devid, u32 eventid, struct vgic_irq **irq);
struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi);
+void vgic_lpi_translation_cache_init(struct kvm *kvm);
+
+#define LPI_CACHE_SIZE(kvm) (atomic_read(&(kvm)->online_vcpus) * 4)
bool vgic_supports_direct_msis(struct kvm *kvm);
int vgic_v4_init(struct kvm *kvm);
--
2.20.1
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next prev parent reply other threads:[~2019-06-06 16:55 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-06 16:54 [PATCH 0/8] KVM: arm/arm64: vgic: ITS translation cache Marc Zyngier
2019-06-06 16:54 ` Marc Zyngier [this message]
2019-06-07 3:47 ` [PATCH 1/8] KVM: arm/arm64: vgic: Add LPI translation cache definition Saidi, Ali
2019-06-07 7:38 ` Marc Zyngier
2019-06-07 8:12 ` Julien Thierry
2019-06-07 8:38 ` Marc Zyngier
2019-06-07 12:09 ` Auger Eric
2019-06-07 12:44 ` Marc Zyngier
2019-06-07 14:15 ` Auger Eric
2019-06-07 15:04 ` Marc Zyngier
2019-06-06 16:54 ` [PATCH 2/8] KVM: arm/arm64: vgic: Add __vgic_put_lpi_locked primitive Marc Zyngier
2019-06-07 12:11 ` Auger Eric
2019-06-06 16:54 ` [PATCH 3/8] KVM: arm/arm64: vgic-its: Cache successful MSI->LPI translation Marc Zyngier
2019-06-07 8:35 ` Julien Thierry
2019-06-07 8:51 ` Marc Zyngier
2019-06-07 8:56 ` Julien Thierry
2019-06-07 9:16 ` Marc Zyngier
2019-06-07 14:29 ` Auger Eric
2019-06-06 16:54 ` [PATCH 4/8] KVM: arm/arm64: vgic-its: Add kvm parameter to vgic_its_free_collection Marc Zyngier
2019-06-07 14:29 ` Auger Eric
2019-06-07 14:49 ` Marc Zyngier
2019-06-06 16:54 ` [PATCH 5/8] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on specific commands Marc Zyngier
2019-06-06 16:54 ` [PATCH 6/8] KVM: arm/arm64: vgic-its: Invalidate MSI-LPI translation cache on disabling LPIs Marc Zyngier
2019-06-06 16:54 ` [PATCH 7/8] KVM: arm/arm64: vgic-its: Check the LPI translation cache on MSI injection Marc Zyngier
2019-06-06 16:54 ` [PATCH 8/8] KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic Marc Zyngier
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