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KVM: nVMX: allow setting the VMFUNC controls MSR

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Allow userspace to set a custom value for the VMFUNC controls MSR, as long
as the capabilities it advertises do not exceed those of the host.

Fixes: 27c42a1bb ("KVM: nVMX: Enable VMFUNC for the L1 hypervisor", 2017-08-03)
Reviewed-by: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2019-07-02 14:40:40 +02:00
parent 6defc59184
commit e8a70bd4e9
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kvm/vmx/nested.c
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@ -1234,6 +1234,11 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
case MSR_IA32_VMX_VMCS_ENUM:
vmx->nested.msrs.vmcs_enum = data;
return 0;
case MSR_IA32_VMX_VMFUNC:
if (data & ~vmx->nested.msrs.vmfunc_controls)
return -EINVAL;
vmx->nested.msrs.vmfunc_controls = data;
return 0;
default:
/*
* The rest of the VMX capability MSRs do not support restore.