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).
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.
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