On 01/26/18 11:46, Andy Lutomirski wrote: > > Under QEMU TCG, gs stays equal to 1. On native or KVM, on Skylake, it > changes to 0. > > On KVM or native, I do not observe do_debug getting called with %gs == > 1. On TCG, I do. I don't think that's precisely the problem that's > causing the test to fail, since the test doesn't use TF or ptrace, but > I wouldn't be shocked if it's related. > > hpa, any insight? > > (NB: if you want to play with this as I've described it, you may need > to make invalid_selector() in ptrace.c always return false. The > current implementation is too strict and causes problems.) > Looking at it. I want to grok this in the general context of fsgsbase as well, of course. -hpa -- To unsubscribe from this list: send the line "unsubscribe linux-kselftest" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
