From e8a70bd4e92525de459acfa5668c8e1f24664331 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Tue, 2 Jul 2019 14:40:40 +0200
Subject: [PATCH] KVM: nVMX: allow setting the VMFUNC controls MSR
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>
---
arch/x86/kvm/vmx/nested.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index c4e29ef0b21e4..163d226efa967 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -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.
--
GitLab