On Thu, Mar 01, 2018 at 09:33:11AM -0500, Waiman Long wrote: > On 03/01/2018 08:34 AM, Joerg Roedel wrote: > I think that should fix the issue of debug exception from userspace. > > One thing that I am not certain about is whether debug exception can > happen even if the IF flag is cleared. If it can, debug exception should > be handled like NMI as the state of the CR3 can be indeterminate if the > exception happens in the entry/exit code. I am actually not 100% sure where it can happen, from the code it can happen from anywhere, except when we are running on an espfix stack. So I am not sure we need the same complex handling NMIs need wrt. to switching the cr3s. 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>
