Re: [Qemu-ppc] [PATCH qemu RFC 1/4] spapr: Allow changing kernel loading address

[David Gibson]

On Sat, Jul 20, 2019 at 11:28:47AM +1000, Alexey Kardashevskiy wrote:
> Useful for the debugging purposes.

Am I correct in understanding this isn't actually necessary for the
rest of the series to work, just useful for debugging?

> 
> Signed-off-by: Alexey Kardashevskiy <address@hidden>
> ---
>  include/hw/ppc/spapr.h |  1 +
>  hw/ppc/spapr.c         | 33 +++++++++++++++++++++++++++------
>  2 files changed, 28 insertions(+), 6 deletions(-)
> 
> diff --git a/include/hw/ppc/spapr.h b/include/hw/ppc/spapr.h
> index 74e427b588fc..ff82bb8554e1 100644
> --- a/include/hw/ppc/spapr.h
> +++ b/include/hw/ppc/spapr.h
> @@ -159,6 +159,7 @@ struct SpaprMachineState {
>      void *fdt_blob;
>      long kernel_size;
>      bool kernel_le;
> +    uint64_t kernel_addr;
>      uint32_t initrd_base;
>      long initrd_size;
>      uint64_t rtc_offset; /* Now used only during incoming migration */
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 7fad42350538..6d13d65d8996 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -1179,7 +1179,7 @@ static void spapr_dt_chosen(SpaprMachineState *spapr, 
> void *fdt)
>                            spapr->initrd_base + spapr->initrd_size));
>  
>      if (spapr->kernel_size) {
> -        uint64_t kprop[2] = { cpu_to_be64(KERNEL_LOAD_ADDR),
> +        uint64_t kprop[2] = { cpu_to_be64(spapr->kernel_addr),
>                                cpu_to_be64(spapr->kernel_size) };
>  
>          _FDT(fdt_setprop(fdt, chosen, "qemu,boot-kernel",
> @@ -1365,7 +1365,7 @@ static void *spapr_build_fdt(SpaprMachineState *spapr)
>  
>      /* Build memory reserve map */
>      if (spapr->kernel_size) {
> -        _FDT((fdt_add_mem_rsv(fdt, KERNEL_LOAD_ADDR, spapr->kernel_size)));
> +        _FDT((fdt_add_mem_rsv(fdt, spapr->kernel_addr, spapr->kernel_size)));
>      }
>      if (spapr->initrd_size) {
>          _FDT((fdt_add_mem_rsv(fdt, spapr->initrd_base, spapr->initrd_size)));
> @@ -1391,7 +1391,8 @@ static void *spapr_build_fdt(SpaprMachineState *spapr)
>  
>  static uint64_t translate_kernel_address(void *opaque, uint64_t addr)
>  {
> -    return (addr & 0x0fffffff) + KERNEL_LOAD_ADDR;
> +    SpaprMachineState *spapr = opaque;
> +    return (addr & 0x0fffffff) + spapr->kernel_addr;
>  }
>  
>  static void emulate_spapr_hypercall(PPCVirtualHypervisor *vhyp,
> @@ -2995,12 +2996,12 @@ static void spapr_machine_init(MachineState *machine)
>          uint64_t lowaddr = 0;
>  
>          spapr->kernel_size = load_elf(kernel_filename, NULL,
> -                                      translate_kernel_address, NULL,
> +                                      translate_kernel_address, spapr,
>                                        NULL, &lowaddr, NULL, 1,
>                                        PPC_ELF_MACHINE, 0, 0);
>          if (spapr->kernel_size == ELF_LOAD_WRONG_ENDIAN) {
>              spapr->kernel_size = load_elf(kernel_filename, NULL,
> -                                          translate_kernel_address, NULL, 
> NULL,
> +                                          translate_kernel_address, spapr, 
> NULL,
>                                            &lowaddr, NULL, 0, PPC_ELF_MACHINE,
>                                            0, 0);
>              spapr->kernel_le = spapr->kernel_size > 0;
> @@ -3016,7 +3017,7 @@ static void spapr_machine_init(MachineState *machine)
>              /* Try to locate the initrd in the gap between the kernel
>               * and the firmware. Add a bit of space just in case
>               */
> -            spapr->initrd_base = (KERNEL_LOAD_ADDR + spapr->kernel_size
> +            spapr->initrd_base = (spapr->kernel_addr + spapr->kernel_size
>                                    + 0x1ffff) & ~0xffff;
>              spapr->initrd_size = load_image_targphys(initrd_filename,
>                                                       spapr->initrd_base,
> @@ -3253,6 +3254,18 @@ static void spapr_set_vsmt(Object *obj, Visitor *v, 
> const char *name,
>      visit_type_uint32(v, name, (uint32_t *)opaque, errp);
>  }
>  
> +static void spapr_get_kernel_addr(Object *obj, Visitor *v, const char *name,
> +                                  void *opaque, Error **errp)
> +{
> +    visit_type_uint64(v, name, (uint64_t *)opaque, errp);
> +}
> +
> +static void spapr_set_kernel_addr(Object *obj, Visitor *v, const char *name,
> +                                  void *opaque, Error **errp)
> +{
> +    visit_type_uint64(v, name, (uint64_t *)opaque, errp);
> +}
> +
>  static char *spapr_get_ic_mode(Object *obj, Error **errp)
>  {
>      SpaprMachineState *spapr = SPAPR_MACHINE(obj);
> @@ -3358,6 +3371,14 @@ static void spapr_instance_init(Object *obj)
>      object_property_add_bool(obj, "vfio-no-msix-emulation",
>                               spapr_get_msix_emulation, NULL, NULL);
>  
> +    object_property_add(obj, "kernel-addr", "uint64", spapr_get_kernel_addr,
> +                        spapr_set_kernel_addr, NULL, &spapr->kernel_addr,
> +                        &error_abort);
> +    object_property_set_description(obj, "kernel-addr",
> +                                    stringify(KERNEL_LOAD_ADDR)
> +                                    " for -kernel is the default",
> +                                    NULL);
> +    spapr->kernel_addr = KERNEL_LOAD_ADDR;
>      /* The machine class defines the default interrupt controller mode */
>      spapr->irq = smc->irq;
>      object_property_add_str(obj, "ic-mode", spapr_get_ic_mode,

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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