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Merge branch 'kvm-arm64/vgic-v4-ctl' into kvmarm/next

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* kvm-arm64/vgic-v4-ctl:
  : Userspace control of nASSGIcap, courtesy of Raghavendra Rao Ananta
  :
  : Allow userspace to decide if support for SGIs without an active state is
  : advertised to the guest, allowing VMs from GICv3-only hardware to be
  : migrated to to GICv4.1 capable machines.
  Documentation: KVM: arm64: Describe VGICv3 registers writable pre-init
  KVM: arm64: selftests: Add test for nASSGIcap attribute
  KVM: arm64: vgic-v3: Allow userspace to write GICD_TYPER2.nASSGIcap
  KVM: arm64: vgic-v3: Allow access to GICD_IIDR prior to initialization
  KVM: arm64: vgic-v3: Consolidate MAINT_IRQ handling
  KVM: arm64: Disambiguate support for vSGIs v. vLPIs

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
This commit is contained in:
Oliver Upton
2025-07-28 08:11:34 -07:00
parent a7f49a9bf4 eed9b14209
commit 0d46e324c0
9 changed files with 158 additions and 50 deletions
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21
arch/arm64/kvm/vgic/vgic-init.c
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@@ -157,6 +157,7 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
kvm->arch.vgic.in_kernel = true;
kvm->arch.vgic.vgic_model = type;
kvm->arch.vgic.implementation_rev = KVM_VGIC_IMP_REV_LATEST;
kvm->arch.vgic.vgic_dist_base = VGIC_ADDR_UNDEF;
@@ -165,6 +166,9 @@ int kvm_vgic_create(struct kvm *kvm, u32 type)
else
INIT_LIST_HEAD(&kvm->arch.vgic.rd_regions);
if (type == KVM_DEV_TYPE_ARM_VGIC_V3)
kvm->arch.vgic.nassgicap = system_supports_direct_sgis();
out_unlock:
mutex_unlock(&kvm->arch.config_lock);
kvm_unlock_all_vcpus(kvm);
@@ -391,11 +395,10 @@ int vgic_init(struct kvm *kvm)
goto out;
/*
* If we have GICv4.1 enabled, unconditionally 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.
* Ensure vPEs are allocated if direct IRQ injection (e.g. vSGIs,
* vLPIs) is supported.
*/
if (vgic_supports_direct_msis(kvm)) {
if (vgic_supports_direct_irqs(kvm)) {
ret = vgic_v4_init(kvm);
if (ret)
goto out;
@@ -409,15 +412,7 @@ int vgic_init(struct kvm *kvm)
goto out;
vgic_debug_init(kvm);
/*
* If userspace didn't set the GIC implementation revision,
* default to the latest and greatest. You know want it.
*/
if (!dist->implementation_rev)
dist->implementation_rev = KVM_VGIC_IMP_REV_LATEST;
dist->initialized = true;
out:
return ret;
}
@@ -443,7 +438,7 @@ static void kvm_vgic_dist_destroy(struct kvm *kvm)
dist->vgic_cpu_base = VGIC_ADDR_UNDEF;
}
if (vgic_supports_direct_msis(kvm))
if (vgic_supports_direct_irqs(kvm))
vgic_v4_teardown(kvm);
xa_destroy(&dist->lpi_xa);