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KVM: arm/arm64: vgic-irqfd: Implement kvm_arch_set_irq_inatomic 

Now that we have a cache of MSI->LPI translations, it is pretty
easy to implement kvm_arch_set_irq_inatomic (this cache can be
parsed without sleeping).

Hopefully, this will improve some LPI-heavy workloads.

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 10:34:48 +00:00
parent 86a7dae884
commit 41108170d9
1 changed files with 30 additions and 6 deletions
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36
virt/kvm/arm/vgic/vgic-irqfd.c
View File

@ -66,6 +66,15 @@ out:
return r;
}
static void kvm_populate_msi(struct kvm_kernel_irq_routing_entry *e,
struct kvm_msi *msi)
{
msi->address_lo = e->msi.address_lo;
msi->address_hi = e->msi.address_hi;
msi->data = e->msi.data;
msi->flags = e->msi.flags;
msi->devid = e->msi.devid;
}
/**
* kvm_set_msi: inject the MSI corresponding to the
* MSI routing entry
@ -79,21 +88,36 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
{
struct kvm_msi msi;
msi.address_lo = e->msi.address_lo;
msi.address_hi = e->msi.address_hi;
msi.data = e->msi.data;
msi.flags = e->msi.flags;
msi.devid = e->msi.devid;
if (!vgic_has_its(kvm))
return -ENODEV;
if (!level)
return -1;
kvm_populate_msi(e, &msi);
return vgic_its_inject_msi(kvm, &msi);
}
/**
* kvm_arch_set_irq_inatomic: fast-path for irqfd injection
*
* Currently only direct MSI injection is supported.
*/
int kvm_arch_set_irq_inatomic(struct kvm_kernel_irq_routing_entry *e,
struct kvm *kvm, int irq_source_id, int level,
bool line_status)
{
if (e->type == KVM_IRQ_ROUTING_MSI && vgic_has_its(kvm) && level) {
struct kvm_msi msi;
kvm_populate_msi(e, &msi);
if (!vgic_its_inject_cached_translation(kvm, &msi))
return 0;
}
return -EWOULDBLOCK;
}
int kvm_vgic_setup_default_irq_routing(struct kvm *kvm)
{
struct kvm_irq_routing_entry *entries;