From: Junaid Shahid junaids@google.com

Upstream commit d35b34a9a70edae7ef923f100e51b8b5ae9fe899.

kvm should not attempt to read guest PDPTEs when CR0.PG = 0 and CR4.PAE = 1.

Signed-off-by: Junaid Shahid junaids@google.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Sean Christopherson sean.j.christopherson@intel.com --- arch/x86/kvm/x86.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 0b6517f5821b..384127a00328 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -587,7 +587,7 @@ static bool pdptrs_changed(struct kvm_vcpu *vcpu) gfn_t gfn; int r;

- if (is_long_mode(vcpu) || !is_pae(vcpu)) + if (is_long_mode(vcpu) || !is_pae(vcpu) || !is_paging(vcpu)) return false;

if (!test_bit(VCPU_EXREG_PDPTR, @@ -7491,7 +7491,7 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, kvm_update_cpuid(vcpu);

idx = srcu_read_lock(&vcpu->kvm->srcu); - if (!is_long_mode(vcpu) && is_pae(vcpu)) { + if (!is_long_mode(vcpu) && is_pae(vcpu) && is_paging(vcpu)) { load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu)); mmu_reset_needed = 1; }