Commit 99158246 authored Jan 31, 2018 by Radim Krčmář Committed by Paolo Bonzini Feb 24, 2018

KVM: nVMX: preserve SECONDARY_EXEC_DESC without UMIP



L1 might want to use SECONDARY_EXEC_DESC, so we must not clear the VMCS
bit if UMIP is not being emulated.

We must still set the bit when emulating UMIP as the feature can be
passed to L2 where L0 will do the emulation and because L2 can change
CR4 without a VM exit, we should clear the bit if UMIP is disabled.

Fixes: 0367f205 ("KVM: vmx: add support for emulating UMIP")
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

parent 0b2e9904

arch/x86/kvm/vmx.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -4485,7 +4485,8 @@ static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
		vmcs_set_bits(SECONDARY_VM_EXEC_CONTROL,
		SECONDARY_EXEC_DESC);
		hw_cr4 &= ~X86_CR4_UMIP;
		} else
		} else if (!is_guest_mode(vcpu) \|\|
		!nested_cpu_has2(get_vmcs12(vcpu), SECONDARY_EXEC_DESC))
		vmcs_clear_bits(SECONDARY_VM_EXEC_CONTROL,
		SECONDARY_EXEC_DESC);

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