On Tue, Dec 08, 2009 at 11:36:59AM +0200, Avi Kivity wrote: > On 12/08/2009 09:57 AM, Sheng Yang wrote: > >vcpu->arch.cr0 = cr0; > >>- vmx_set_cr4(vcpu, vcpu->arch.cr4); > >>+ vmx_set_cr4(vcpu, kvm_read_cr4(vcpu)); > >> } > >Another place accessed cr4 directly, in ept_update_paging_mode_cr4() > > > > That one is called from vmx_set_cr4(); at that time CR4_READ_SHADOW > is not up-to-date and vmx_decache_cr4_guest_bits() will actually > corrupt vcpu->arch.cr4 (except it won't be called, since cr4.pae is > never guest owned). Yes, you are right... > > But you are right, I should have placed a comment. I'll add a patch > that inlines ept_update_paging_mode_cr4 into its caller so it can > access the cr4 parameter directly instead of vcpu->arch.cr4. Just notice another thing, seems the cr4_guest_owned_bits' initial value is wrong. It should be ~KVM_GUEST_CR4_MASK rather than KVM_GUEST_CR4_MASK in this patch IIUC. -- regards Yang, Sheng -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
