KVM: arm/arm64: vgic: Add LPI translation cache definition

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 16*nr_vcpus.

Tested-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2019-03-18 10:13:01 +00:00
parent d45331b00d
commit 24cab82c34
4 changed files with 59 additions and 0 deletions

View File

@ -249,6 +249,9 @@ struct vgic_dist {
struct list_head lpi_list_head;
int lpi_list_count;
/* LPI translation cache */
struct list_head lpi_translation_cache;
/* used by vgic-debug */
struct vgic_state_iter *iter;

View File

@ -53,6 +53,7 @@ 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);
}
@ -294,6 +295,7 @@ 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;
@ -335,6 +337,9 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
INIT_LIST_HEAD(&dist->rd_regions);
}
if (vgic_has_its(kvm))
vgic_lpi_translation_cache_destroy(kvm);
if (vgic_supports_direct_msis(kvm))
vgic_v4_teardown(kvm);
}

View File

@ -138,6 +138,14 @@ struct its_ite {
u32 event_id;
};
struct vgic_translation_cache_entry {
struct list_head entry;
phys_addr_t db;
u32 devid;
u32 eventid;
struct vgic_irq *irq;
};
/**
* struct vgic_its_abi - ITS abi ops and settings
* @cte_esz: collection table entry size
@ -1657,6 +1665,45 @@ out:
return ret;
}
/* Default is 16 cached LPIs per vcpu */
#define LPI_DEFAULT_PCPU_CACHE_SIZE 16
void vgic_lpi_translation_cache_init(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
unsigned int sz;
int i;
if (!list_empty(&dist->lpi_translation_cache))
return;
sz = atomic_read(&kvm->online_vcpus) * LPI_DEFAULT_PCPU_CACHE_SIZE;
for (i = 0; i < sz; 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);
}
}
void vgic_lpi_translation_cache_destroy(struct kvm *kvm)
{
struct vgic_dist *dist = &kvm->arch.vgic;
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);
}
}
#define INITIAL_BASER_VALUE \
(GIC_BASER_CACHEABILITY(GITS_BASER, INNER, RaWb) | \
GIC_BASER_CACHEABILITY(GITS_BASER, OUTER, SameAsInner) | \
@ -1685,6 +1732,8 @@ 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);

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@ -307,6 +307,8 @@ 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);
void vgic_lpi_translation_cache_destroy(struct kvm *kvm);
bool vgic_supports_direct_msis(struct kvm *kvm);
int vgic_v4_init(struct kvm *kvm);