On Thu, Mar 01, 2018 at 01:24:39PM -0500, Brian Gerst wrote: > The IF flag only affects external maskable interrupts, not traps or > faults. You do need to check CR3 because SYSENTER does not clear TF > and will immediately cause a debug trap on kernel entry (with user > CR3) if set. That is why the code existed before to check for the > entry stack for debug/NMI. Yeah, okay, thanks for the clarification. This also means the #DB handler needs to leave with the same cr3 as it entered. I'll work that into my patches. Thanks, Joerg -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
