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| author | Marc Zyngier <maz@kernel.org> | 2025-05-14 11:34:45 +0100 |
|---|---|---|
| committer | Marc Zyngier <maz@kernel.org> | 2025-05-19 07:59:46 +0100 |
| commit | 469c4713d48028186e4bbf4b74ebce273af9a394 (patch) | |
| tree | 081ae0c976e01e5e3eff28f74d42f70b004e4d38 /arch/arm64/kvm/nested.c | |
| parent | fb3066904a4e2562cbcf71b26b0f0dc7a262280c (diff) | |
| download | lwn-469c4713d48028186e4bbf4b74ebce273af9a394.tar.gz lwn-469c4713d48028186e4bbf4b74ebce273af9a394.zip | |
KVM: arm64: nv: Allocate VNCR page when required
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>
Diffstat (limited to 'arch/arm64/kvm/nested.c')
| -rw-r--r-- | arch/arm64/kvm/nested.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c index 4a3fc11f7ecf..0513f1367219 100644 --- a/arch/arm64/kvm/nested.c +++ b/arch/arm64/kvm/nested.c @@ -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; } |