[PATCH v7 63/68] KVM: arm64: nv: Allocate VNCR page when required
From: Marc Zyngier <maz@kernel.org>
Date: 2023-01-12 19:45:31
Also in:
kvm, kvmarm
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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 --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 d061dcc21578..18260062387b 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); } static void kvm_vcpu_reset_sve(struct kvm_vcpu *vcpu)
--
2.34.1
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