On Sat, Dec 22, 2012 at 02:38:29AM -0800, Yinghai Lu wrote: > On Fri, Dec 21, 2012 at 6:42 PM, Konrad Rzeszutek Wilk > <konrad.w...@oracle.com> wrote: > > On Mon, Dec 17, 2012 at 11:15:32PM -0800, Yinghai Lu wrote: > >> Now we have limit kdump reseved under 896M, because kexec has the > >> limitation. > >> and also bzImage need to stay under 4g. > >> > >> To make kexec/kdump could use range above 4g, we need to make bzImage and > >> ramdisk could be loaded above 4g. > >> During booting bzImage will be unpacked on same postion and stay high. > >> > >> The patches add fields in setup_header and boot_params to > >> 1. get info about ramdisk position info above 4g from bootloader/kexec > >> 2. get info about cmd_line_ptr info above 4g from bootloader/kexec > >> 3. set xloadflags bit0 in header for bzImage and bootloader/kexec load > >> could check that to decide if it could to put bzImage high. > >> 4. use sentinel to make sure ext_* fields in boot_params could be used. > >> > >> This patches is tested with kexec tools with local changes and they are > >> sent > >> to kexec list later. > >> > >> could be found at: > >> > >> > >> git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git > >> for-x86-boot > > > > Did a light test and it looks to work under Xen - thought I had not tested > > any various configuration of memory layouts. > > > > More worryingly it blew up under native under an Dell T105 AMD box with 4GB > > of memory. > > I can't get it even to print anything on the serial log: > > can you try that branch again ? update the #PF handler to clean > init_level4_pgt in all case.
Sure. Building and will email out the results shortly. > > I did not consider when you are xen enabled kernel on bare metal. As in 'CONFIG_PARAVIRT_OPS' enabled? > > aka need to add > clear_page(init_level4_pgt); > > in init_mapping_kernel() of head_64.S > > Thanks > > Yinghai -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
