Hi! > This patch implements the functionality of jumping between the kexeced > kernel and the original kernel. > > A new reboot command named LINUX_REBOOT_CMD_KJUMP is defined to > trigger the jumping to (executing) the new kernel and jumping back to > the original kernel. > > To support jumping between two kernels, before jumping to (executing) > the new kernel and jumping back to the original kernel, the devices > are put into quiescent state (to be fully implemented), and the state > of devices and CPU is saved. After jumping back from kexeced kernel > and jumping to the new kernel, the state of devices and CPU are > restored accordingly. The devices/CPU state save/restore code of > software suspend is called to implement corresponding function. > > To support jumping without preserving memory. One shadow backup page > is allocated for each page used by new (kexeced) kernel. When do > kexec_load, the image of new kernel is loaded into shadow pages, and > before executing, the original pages and the shadow pages are swapped, > so the contents of original pages are backuped. Before jumping to the > new (kexeced) kernel and after jumping back to the original kernel, > the original pages and the shadow pages are swapped too. > > A jump back protocol is defined and documented. > Signed-off-by: Huang Ying <ying.huang@xxxxxxxxx> Seems like good enough for -mm to me. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
