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KVM: arm64: vgic-v4: Initialize GICv4.1 even in the absence of a virtual ITS 

KVM now expects to be able to use HW-accelerated delivery of vSGIs
as soon as the guest has enabled thm. Unfortunately, we only
initialize the GICv4 context if we have a virtual ITS exposed to
the guest.

Fix it by always initializing the GICv4.1 context if it is
available on the host.

Fixes: 2291ff2f2a ("KVM: arm64: GICv4.1: Plumb SGI implementation selection in the distributor")
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
alistair/sunxi64-5.7-dsi
Marc Zyngier 2020-04-24 15:30:30 +01:00
parent 6e977984f6
commit 958e8e14fd
2 changed files with 10 additions and 2 deletions
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9
virt/kvm/arm/vgic/vgic-init.c
View File

@ -294,8 +294,15 @@ int vgic_init(struct kvm *kvm)
}
}
if (vgic_has_its(kvm)) {
if (vgic_has_its(kvm))
vgic_lpi_translation_cache_init(kvm);
/*
* If we have GICv4.1 enabled, unconditionnaly request enable the
* v4 support so that we get HW-accelerated vSGIs. Otherwise, only
* enable it if we present a virtual ITS to the guest.
*/
if (vgic_supports_direct_msis(kvm)) {
ret = vgic_v4_init(kvm);
if (ret)
goto out;

3
virt/kvm/arm/vgic/vgic-mmio-v3.c
View File

@ -50,7 +50,8 @@ bool vgic_has_its(struct kvm *kvm)
bool vgic_supports_direct_msis(struct kvm *kvm)
{
return kvm_vgic_global_state.has_gicv4 && vgic_has_its(kvm);
return (kvm_vgic_global_state.has_gicv4_1 ||
(kvm_vgic_global_state.has_gicv4 && vgic_has_its(kvm)));
}
/*