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KVM: MMU: handle invalid root_hpa at __direct_map
commit 989c6b34f6a9480e397b170cc62237e89bf4fdb9 upstream. It is possible for __direct_map to be called on invalid root_hpa (-1), two examples: 1) try_async_pf -> can_do_async_pf -> vmx_interrupt_allowed -> nested_vmx_vmexit 2) vmx_handle_exit -> vmx_interrupt_allowed -> nested_vmx_vmexit Then to load_vmcs12_host_state and kvm_mmu_reset_context. Check for this possibility, let fault exception be regenerated. BZ: https://bugzilla.redhat.com/show_bug.cgi?id=924916 Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Cc: Josh Boyer <jwboyer@fedoraproject.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -2585,6 +2585,9 @@ static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
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int emulate = 0;
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gfn_t pseudo_gfn;
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if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
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return 0;
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for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) {
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if (iterator.level == level) {
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mmu_set_spte(vcpu, iterator.sptep, ACC_ALL,
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