On Mon, Jan 16, 2017 at 10:53:07AM -0800, Alistair Francis wrote: > On Sun, Jan 15, 2017 at 11:59 PM, Thomas Huth <th...@redhat.com> wrote: > > On 14.01.2017 12:03, Laurent Vivier wrote: > >> Le 14/01/2017 à 07:51, Thomas Huth a écrit : > >>> Sometimes it is useful to have just a machine with CPU and RAM, without > >>> any further hardware in it, e.g. if you just want to do some instruction > >>> debugging for TCG with a remote GDB attached to QEMU, or run some embedded > >>> code with the "-semihosting" QEMU parameter. qemu-system-m68k already > >>> features a "dummy" machine, and xtensa a "sim" machine for exactly this > >>> purpose. > >>> All target architectures have nowadays also a "none" machine, which would > >>> be a perfect match for this, too - but it currently does not allow to add > >>> CPU, RAM or a kernel yet. Thus let's add these possibilities in a generic > >>> way to the "none" machine, too, so that we hopefully do not need > >>> additional > >>> "dummy" machines in the future anymore (and maybe can also get rid of the > >>> already existing "dummy"/"sim" machines one day). > >>> Note that the default behaviour of the "none" machine is not changed, i.e. > >>> no CPU and no RAM is instantiated by default. You've explicitely got to > >>> specify the CPU model with "-cpu" and the amount of RAM with "-m" to get > >>> these new features. > >> > >> Did you try to use the generic-loader to load the kernel? > >> > >> Something like "-device loader,file=vmlinux" instead of adding this part > >> in the none machine? > > > > It does not work by default - because we need a way to set the CPU's > > program counter to the entry point of the ELF file. > > The -device loader logic can set the PC to the entry point of the ELF. > You just need to specify 'cpu-num=x' when loading the file. > > > But I think the users also expect the "-kernel" parameter to be working, > > so I think we should add the loader code in null-machine.c anyway. > > I agree that uses probably expect the '-kernel' option to work as well.
So, is it possible to write a generic load_kernel() function that simply reuses the generic-loader code? -- Eduardo
