Re: [Qemu-devel] [PATCH v5 3/5] ARM: Add numa-node-id for /memory node

[Andrew Jones <drjones@redhat.com>]

On Sat, Apr 23, 2016 at 09:16:11AM +0800, Shannon Zhao wrote:
> 
> 
> On 2016/4/22 20:48, Andrew Jones wrote:
> > On Thu, Apr 21, 2016 at 02:23:52PM +0800, Shannon Zhao wrote:
> >> From: Shannon Zhao <shannon.zhao@linaro.org>
> >>
> >> When specifying NUMA for ARM machine, generate /memory node according to
> >> NUMA topology.
> >>
> >> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> >> ---
> >>  hw/arm/boot.c | 31 ++++++++++++++++++++++++++++++-
> >>  1 file changed, 30 insertions(+), 1 deletion(-)
> >>
> >> diff --git a/hw/arm/boot.c b/hw/arm/boot.c
> >> index 5975fbf..3770235 100644
> >> --- a/hw/arm/boot.c
> >> +++ b/hw/arm/boot.c
> >> @@ -14,6 +14,7 @@
> >>  #include "hw/arm/linux-boot-if.h"
> >>  #include "sysemu/kvm.h"
> >>  #include "sysemu/sysemu.h"
> >> +#include "sysemu/numa.h"
> >>  #include "hw/boards.h"
> >>  #include "hw/loader.h"
> >>  #include "elf.h"
> >> @@ -405,6 +406,9 @@ static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
> >>      void *fdt = NULL;
> >>      int size, rc;
> >>      uint32_t acells, scells;
> >> +    char *nodename;
> >> +    unsigned int i;
> >> +    hwaddr mem_base, mem_len;
> >>  
> >>      if (binfo->dtb_filename) {
> >>          char *filename;
> >> @@ -456,14 +460,39 @@ static int load_dtb(hwaddr addr, const struct arm_boot_info *binfo,
> >>          goto fail;
> >>      }
> >>  
> >> +    mem_len = (nb_numa_nodes > 0) ? numa_info[0].node_mem : binfo->ram_size;
> >>      rc = qemu_fdt_setprop_sized_cells(fdt, "/memory", "reg",
> > 
> > So node0's memory node will still be called '/memory' instead of
> > '/memory@addr' like the other nodes? Shouldn't we change it too?
> > 
> Previously I deleted the /memory node creation codes in virt.c and
> create here, but that will cause other boards booting fail since
> load_dtb() is a common function. So to avoid more changes to other
> files, I just use current way. So is there any way to change the node
> name after it's created in qemu?

I'm not sure if that's possible, but we could maybe use qemu_fdt_nop_node
to turn /memory into a NOP node, and then add a new one?

drew