Hi Fam Thanks! Yes gdb provides one approach but I was wondering if there was something built in to QEMU monitor.
Another application I can see for this would be to inject errors into the memory, This will be useful for testing new NVDIMM-P technology that builds NVDIMMs out of material that is less reliable than DRAM... Cheers Stephen > On Sep 12, 2016, at 7:28 PM, Fam Zheng <f...@redhat.com> wrote: > >> On Mon, 09/12 16:23, Stephen Bates wrote: >> Hi > > Hi Stephen, > >> >> I sent this to qemu-discuss with no success so resending to qemu-devel. >> >> I am doing some very low level OS design work and wanted to be able to >> alter some values in the physical memory of my QEMU guest. I can see quite >> a few ways to print/dump both physical and virtual addresses but nothing >> that can alter arbitrary physical/virtual addresses? >> >> Does such a feature exist in Qemu and if it does are there pointers to >> documentation for it? > > Have you tried the builtin gdbstub in QEMU? You can add "-s" to the QEMU > command line and then connect to it from gdb with "target remote :1234". There > you can inspect or change memory more easily. > > Fam > >> >> I do see that we can use file backing for very large memory regions via >> the memory-backing-file option but I am not really trying to alter massive >> regions of memory in this case. >> >> Cheers >> >> Stephen Bates >>
