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 ==
- 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@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html