KVM: VMX: always require WB memory type for EPT
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 <david@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b83724d..19aa69a 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1200,6 +1200,11 @@
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 @@
{
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 @@
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;