On Wed, Dec 21, 2016 at 12:00 PM, Paolo Bonzini <pbonzini@xxxxxxxxxx> wrote: > > > On 21/12/2016 10:41, Dmitry Vyukov wrote: >> Hello, >> >> I am getting some KVM_EXIT_INTERNAL_ERROR/KVM_INTERNAL_ERROR_EMULATION >> while fuzzing KVM. Does it indicate a bug in kvm code? > > No, it just indicates something that isn't implemented. Other > KVM_EXIT_INTERNAL_ERROR cases indicate a bug in the userspace code. Something is not implemented where? You mean host userspace (VMM)? But what about guest container killing whole VM? It looks equivalent to non-root killing machine. > If you're running nested virtualization and the nested guest manages to > kill the host, that's bad. Otherwise, they're harmless. > > Paolo > >> To make it clear, the context is that guest does all kind of weird >> stuff and if it kills itself it is fine. I am just trying to catch bad >> effects on the host. >> As far as I can tell, if qemu gets KVM_EXIT_INTERNAL_ERROR it will >> fail. So for user it will look like qemu misbehaves. E.g. it will not >> auto restart the VM. >> If KVM_EXIT_INTERNAL_ERROR/KVM_INTERNAL_ERROR_EMULATION is OK, are >> other KVM_EXIT_INTERNAL_ERROR error codes worse? Are there any other >> indications that host is affected in a bad way? I mean besides BUGs, >> WARNINGs and crashes of the host kernel. >> >> Thanks >> -- >> 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 >> -- 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
