Re: [BUG] Nested Virtualization Bug on x86-64 AMD CPU

2023-12-05 Thread Reima ISHII
larly considering Xen's current lack of AVIC support. > But, is this by any chance all running nested under KVM in your fuzzer? No, KVM was not used. The issue was observed on a Xen hypervisor's domU HVM running directly on the hardware. Within the guest HVM, a simple custom hypervisor was

[BUG] Nested Virtualization Bug on x86-64 AMD CPU

2023-12-05 Thread Reima ISHII
) (XEN) (XEN) Panic on CPU 10: (XEN) Xen BUG at arch/x86/hvm/svm/nestedsvm.c:983 (XEN) (XEN) -- Graduate School of Information Science and Technology, The University of Tokyo Reima Ishii ish...@g.ecc.u-tokyo.ac.jp

[BUG] Assertion failure with vmcb->_vintr.fields.vgif in nested SVM

2023-11-12 Thread Reima ISHII
anic on CPU 2: (XEN) Assertion 'vmcb->_vintr.fields.vgif == 0' failed at arch/x86/hvm/svm/nestedsvm.c:799 (XEN) Thanks, -- Graduate School of Information Science and Technology, The University of Tokyo Reima Ishii ish...@g.ecc.u-tokyo.ac.jp