At 03/02/2012 08:49 AM, HATAYAMA Daisuke Wrote: > From: Wen Congyang <we...@cn.fujitsu.com> > Subject: Re: [RFC][PATCH 00/14 v7] introducing a new, dedicated memory dump > mechanism > Date: Thu, 01 Mar 2012 13:16:47 +0800 > >> At 03/01/2012 12:42 PM, HATAYAMA Daisuke Wrote: >>> From: Wen Congyang <we...@cn.fujitsu.com> >>> Subject: [RFC][PATCH 00/14 v7] introducing a new, dedicated memory dump >>> mechanism >>> Date: Thu, 01 Mar 2012 10:35:44 +0800 >>> >>>> Hi, all >>>> >>>> 'virsh dump' can not work when host pci device is used by guest. We have >>>> discussed this issue here: >>>> http://lists.nongnu.org/archive/html/qemu-devel/2011-10/msg00736.html >>>> >>>> The last version is here: >>>> http://lists.nongnu.org/archive/html/qemu-devel/2012-02/msg01007.html >>>> >>>> We have determined to introduce a new command dump to dump memory. The core >>>> file's format can be elf. >>>> >>>> Note: >>>> 1. The guest should be x86 or x86_64. The other arch is not supported now. >>>> 2. If you use old gdb, gdb may crash. I use gdb-7.3.1, and it does not >>>> crash. >>> >>> Does this say the thing caused by gdb versions with no Dwarf V3 >>> support? If so, it's better to write that too explicitly here. >> >> I donot know why gdb crashed, and I cannot reproduce this problem now. >> > > Sorry. I meant Dwarf4. Recent GCC emits binary with Dwarf4 in default, > and older GDBs cannot handle them although I don't know this is the > same as what you saw.
I guess it is not, as I cannot reproduce this problem. Thanks Wen Congyang > >>>> 3. If the OS is in the second kernel, gdb may not work well, and crash can >>>> work by specifying '--machdep phys_addr=xxx' in the command line. The >>>> reason is that the second kernel will update the page table, and we can >>>> not get the page table for the first kernel. >>>> 4. The cpu's state is stored in QEMU note. You neet to modify crash to use >>>> it to calculate phys_base. >>> >>> Again, you still need to fix crash utility to recover the 1st kernel's >>> first 640kB physical memory that has been reserved during switch from >>> 1st kernel to 2nd kernel. >> >> It is another work, I will try to do it in the future. >> > > Please. > > Thanks. > HATAYAMA, Daisuke > >