From: Vivek Goyal <vgoyal@xxxxxxxxxx> Subject: Re: [PATCH] kdump, x86: report actual value of phys_base in VMCOREINFO Date: Wed, 12 Nov 2014 17:12:05 -0500 > On Wed, Nov 12, 2014 at 03:40:42PM +0900, HATAYAMA Daisuke wrote: >> Currently, VMCOREINFO note information reports the virtual address of >> phys_base that is assigned to symbol phys_base. But this doesn't make >> sense because to refer to value of the phys_base, it's necessary to >> get the value of phys_base itself we are now about to refer to. >> > > Hi Hatayama, > > /proc/vmcore ELF headers have virtual address information and using > that you should be able to read actual value of phys_base. gdb deals > with virtual addresses all the time and can read value of any symbol > using those headers. > > So I am not sure what's the need for exporting actual value of > phys_base. > Sorry, my logic in the patch description was wrong. For /proc/vmcore, there's enough information for makedumpdile to get phys_base. It's correct. The problem here is that other crash dump mechanisms that run outside Linux kernel independently don't have information to get phys_base. Thanks. HATAYAMA, Daisuke
