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KVM: VMX: Enforce EPT pagetable level checking

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We only support 4 levels EPT pagetable now.

Signed-off-by: Sheng Yang <sheng@linux.intel.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Sheng Yang 2010-06-02 14:05:24 +08:00 committed by Avi Kivity
parent d2d7a61127
commit 4bc9b98281
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kvm/vmx.c
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@ -340,6 +340,11 @@ static inline bool cpu_has_vmx_ept_1g_page(void)
return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
}
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_invept_individual_addr(void)
{
return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
@ -1568,7 +1573,8 @@ static __init int hardware_setup(void)
if (!cpu_has_vmx_vpid())
enable_vpid = 0;
if (!cpu_has_vmx_ept()) {
if (!cpu_has_vmx_ept() ||
!cpu_has_vmx_ept_4levels()) {
enable_ept = 0;
enable_unrestricted_guest = 0;
}