Hi ARM-KVM folks I've reviewed and applied the recently updated patch from Marc. Its patch title is "[PATCH v3 03/11] arm64: KVM: trap VM system registers until MMU and caches are ON". After applying the patch, I can see the following panic messages. [ 282.430679] kvm [919]: Unkown exception class: hsr: 0x2000000 [ 282.434943] BUG: failure at arch/arm64/kvm/handle_exit.c:95/kvm_get_exit_handler()! [ 282.442714] Kernel panic - not syncing: BUG! [ 282.446818] CPU: 0 PID: 919 Comm: kvm-vcpu-0 Not tainted 3.13.0+ #1 [ 282.453053] Call trace: [ 282.455491] [<ffffffc0000871e0>] dump_backtrace+0x0/0x12c [ 282.460858] [<ffffffc000087320>] show_stack+0x14/0x1c [ 282.465887] [<ffffffc000400784>] dump_stack+0x70/0xbc [ 282.470911] [<ffffffc0003fd848>] panic+0xe8/0x208 [ 282.475591] [<ffffffc00009a614>] handle_exit+0x150/0x170 [ 282.480876] [<ffffffc000097244>] kvm_arch_vcpu_ioctl_run+0x144/0x3bc [ 282.487205] [<ffffffc0000946dc>] kvm_vcpu_ioctl+0x55c/0x654 [ 282.492752] [<ffffffc000155c28>] do_vfs_ioctl+0x2f8/0x570 [ 282.498123] [<ffffffc000155ee4>] SyS_ioctl+0x44/0x78 Can I get an idea on this? Before applying the patch, guest kernel goes to vector table when trying to set sctlr_el1 in the following codes. __turn_mmu_on: msr sctlr_el1, x0 isb br x27 ENDPROC(__turn_mmu_on) That is my starting point to review and apply the latest patches in the mailing list. After applying Marc's patch, the guest does not fall into vector table at the above point. However, the original intention of the patch is to detect the point where the guest enables M+C. So, another question is as follows. According to the symptom, all system registers should trapped before enabling M+C. Could I get a comment on why they should be trapped? I'm using 3.13-stable kernel + Marc's patches and kvm tool from Will's tree as KVM and guest launcher respectively. Best Regards Jungseok Lee _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/cucslists/listinfo/kvmarm
