linux-kernel - [PATCH 2/3] KVM: nVMX: allow setting the VMFUNC controls MSR

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Date:   Tue,  2 Jul 2019 17:04:35 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Liran Alon <liran.alon@...cle.com>, stable@...r.kernel.org
Subject: [PATCH 2/3] 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)
Cc: stable@...r.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@...hat.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 c4e29ef0b21e..163d226efa96 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.
-- 
1.8.3.1