From 42aa53b4e1c05212baf63842515b22920241e5e1 Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Thu, 10 Aug 2017 23:15:29 +0200 Subject: [PATCH] KVM: VMX: always require WB memory type for EPT MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit We already always set that type but don't check if it is supported. Also for nVMX, we only support WB for now. Let's just require it. Signed-off-by: David Hildenbrand Signed-off-by: Radim Krčmář --- arch/x86/kvm/vmx.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index b83724dce879..19aa69af7c2d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -1200,6 +1200,11 @@ static inline bool cpu_has_vmx_ept_4levels(void) return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT; } +static inline bool cpu_has_vmx_ept_mt_wb(void) +{ + return vmx_capability.ept & VMX_EPTP_WB_BIT; +} + static inline bool cpu_has_vmx_ept_ad_bits(void) { return vmx_capability.ept & VMX_EPT_AD_BIT; @@ -4300,7 +4305,6 @@ static u64 construct_eptp(struct kvm_vcpu *vcpu, unsigned long root_hpa) { u64 eptp = VMX_EPTP_MT_WB | VMX_EPTP_PWL_4; - /* TODO write the value reading from MSR */ if (enable_ept_ad_bits && (!is_guest_mode(vcpu) || nested_ept_ad_enabled(vcpu))) eptp |= VMX_EPTP_AD_ENABLE_BIT; @@ -6635,7 +6639,8 @@ static __init int hardware_setup(void) init_vmcs_shadow_fields(); if (!cpu_has_vmx_ept() || - !cpu_has_vmx_ept_4levels()) { + !cpu_has_vmx_ept_4levels() || + !cpu_has_vmx_ept_mt_wb()) { enable_ept = 0; enable_unrestricted_guest = 0; enable_ept_ad_bits = 0; -- 2.20.1