KVM: nVMX: fix nested EPT detection
authorLadi Prosek <lprosek@redhat.com>
Thu, 23 Mar 2017 06:18:08 +0000 (07:18 +0100)
committerPaolo Bonzini <pbonzini@redhat.com>
Tue, 28 Mar 2017 08:10:15 +0000 (10:10 +0200)
commit7ad658b693536741c37b16aeb07840a2ce75f5b9
tree7b865d5e02a05db83e9684bafad0ebf5fe0e8ea3
parent0292e169b2d9c8377a168778f0b16eadb1f578fd
KVM: nVMX: fix nested EPT detection

The nested_ept_enabled flag introduced in commit 7ca29de2136 was not
computed correctly. We are interested only in L1's EPT state, not the
the combined L0+L1 value.

In particular, if L0 uses EPT but L1 does not, nested_ept_enabled must
be false to make sure that PDPSTRs are loaded based on CR3 as usual,
because the special case described in 26.3.2.4 Loading Page-Directory-
Pointer-Table Entries does not apply.

Fixes: 7ca29de21362 ("KVM: nVMX: fix CR3 load if L2 uses PAE paging and EPT")
Cc: qemu-stable@nongnu.org
Reported-by: Wanpeng Li <wanpeng.li@hotmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Ladi Prosek <lprosek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
arch/x86/kvm/vmx.c