diff mbox series

[v8,64/69] KVM: arm64: nv: Allocate VNCR page when required

Message ID 20230131092504.2880505-65-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: ARMv8.3/8.4 Nested Virtualization support | expand

Commit Message

Marc Zyngier Jan. 31, 2023, 9:24 a.m. UTC 
If running a NV guest on an ARMv8.4-NV capable system, let's
allocate an additional page that will be used by the hypervisor
to fulfill system register accesses.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/nested.c | 10 ++++++++++
 arch/arm64/kvm/reset.c  |  1 +
 2 files changed, 11 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index f93f4248c6f3..19f07aa8fa68 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -38,6 +38,14 @@  int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu)
 	if (!cpus_have_final_cap(ARM64_HAS_NESTED_VIRT))
 		return -EINVAL;
 
+	if (cpus_have_final_cap(ARM64_HAS_ENHANCED_NESTED_VIRT)) {
+		if (!vcpu->arch.ctxt.vncr_array)
+			vcpu->arch.ctxt.vncr_array = (u64 *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
+
+		if (!vcpu->arch.ctxt.vncr_array)
+			return -ENOMEM;
+	}
+
 	mutex_lock(&kvm->lock);
 
 	/*
@@ -67,6 +75,8 @@  int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu)
 		    kvm_init_stage2_mmu(kvm, &tmp[num_mmus - 2], 0)) {
 			kvm_free_stage2_pgd(&tmp[num_mmus - 1]);
 			kvm_free_stage2_pgd(&tmp[num_mmus - 2]);
+			free_page((unsigned long)vcpu->arch.ctxt.vncr_array);
+			vcpu->arch.ctxt.vncr_array = NULL;
 		} else {
 			kvm->arch.nested_mmus_size = num_mmus;
 			ret = 0;
diff --git a/arch/arm64/kvm/reset.c b/arch/arm64/kvm/reset.c
index 49a3257dec46..8417d2fa0ebd 100644
--- a/arch/arm64/kvm/reset.c
+++ b/arch/arm64/kvm/reset.c
@@ -161,6 +161,7 @@  void kvm_arm_vcpu_destroy(struct kvm_vcpu *vcpu)
 	if (sve_state)
 		kvm_unshare_hyp(sve_state, sve_state + vcpu_sve_state_size(vcpu));
 	kfree(sve_state);
+	free_page((unsigned long)vcpu->arch.ctxt.vncr_array);
 	kfree(vcpu->arch.ccsidr);
 }