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KVM: arm64: nv: Allocate VNCR page when required

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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.

Reviewed-by: Ganapatrao Kulkarni <gankulkarni@os.amperecomputing.com>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20250514103501.2225951-3-maz@kernel.org
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Marc Zyngier 2025-05-14 11:34:45 +01:00
parent fb3066904a
commit 469c4713d4
2 changed files with 11 additions and 0 deletions
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10
arch/arm64/kvm/nested.c
View File

@ -55,6 +55,13 @@ int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu)
!cpus_have_final_cap(ARM64_HAS_HCR_NV1))
return -EINVAL;
if (!vcpu->arch.ctxt.vncr_array)
vcpu->arch.ctxt.vncr_array = (u64 *)__get_free_page(GFP_KERNEL_ACCOUNT |
__GFP_ZERO);
if (!vcpu->arch.ctxt.vncr_array)
return -ENOMEM;
/*
* Let's treat memory allocation failures as benign: If we fail to
* allocate anything, return an error and keep the allocated array
@ -85,6 +92,9 @@ int kvm_vcpu_init_nested(struct kvm_vcpu *vcpu)
for (int i = kvm->arch.nested_mmus_size; i < num_mmus; i++)
kvm_free_stage2_pgd(&kvm->arch.nested_mmus[i]);
free_page((unsigned long)vcpu->arch.ctxt.vncr_array);
vcpu->arch.ctxt.vncr_array = NULL;
return ret;
}

1
arch/arm64/kvm/reset.c
View File

@ -158,6 +158,7 @@ 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);
}