https://bugzilla.kernel.org/show_bug.cgi?id=65561 --- Comment #12 from Paolo Bonzini <bonzini@xxxxxxx> --- > Hi, Paolo, thanks for your explanation. I am interested in fixing this. So > what's the technical challenge here? The first step is to reproduce the failure. To do this you can make a patch to kvm-unit-tests (git://git.kernel.org/pub/scm/virt/kvm/kvm-unit-tests.git). 0x80000021 means invalid guest state in the VMCS (the VM information that is passed to the processor). So you could try adding some printk to understand what is the invalid guest state. To do this you need to download the Intel manuals (known as "Intel SDM", google is your friend). You can post the testcase patch on kvm@xxxxxxxxxxxxxxx once you have a reproducer. > When you say "support for single-stepping and breakpoints in the emulator is > quite minimal", do you mean it's a problem in the Qemu side, rather than > something wrong in the kvm kernel modules? If so, and if we want to fix this, > we need to make some changes in the Qemu code, right? No, the emulator is part of KVM, see arch/x86/kvm/emulate.c. I have some pending patches for it, destined to 3.17. There is a small chance that they fix the bug. -- You are receiving this mail because: You are watching the assignee of the bug. -- 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
