[Qemu-devel] Re: [PATCH 13/26] Start implementing pSeries logical partition machine

[Alexander Graf]

On 03/16/2011 05:56 AM, David Gibson wrote:
> This patch adds a "pseries" machine to qemu.  This aims to emulate a
> logical partition on an IBM pSeries machine, compliant to the
> "PowerPC Architecture Platform Requirements" (PAPR) document.
>
> This initial version is quite limited, it implements a basic machine
> and PAPR hypercall emulation.  So far only one hypercall is present -
> H_PUT_TERM_CHAR - so that a (write-only) console is available.
>
> Multiple CPUs are permitted, with SMP entry handled kexec() style.
>
> The machine so far more resembles an old POWER4 style "full system
> partition" rather than a modern LPAR, in that the guest manages the
> page tables directly, rather than via hypercalls.
>
> The machine requires qemu to be configured with --enable-fdt.  The
> machine can (so far) only be booted with -kernel - i.e. no partition
> firmware is provided.
>
> Signed-off-by: David Gibson<address@hidden>
> ---
>   Makefile.target  |    2 +
>   hw/spapr.c       |  314 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
>   hw/spapr.h       |  246 ++++++++++++++++++++++++++++++++++++++++++
>   hw/spapr_hcall.c |   43 ++++++++
>   4 files changed, 605 insertions(+), 0 deletions(-)
>   create mode 100644 hw/spapr.c
>   create mode 100644 hw/spapr.h
>   create mode 100644 hw/spapr_hcall.c
>
> diff --git a/Makefile.target b/Makefile.target
> index f0df98e..e6a7557 100644
> --- a/Makefile.target
> +++ b/Makefile.target
> @@ -231,6 +231,8 @@ obj-ppc-y += ppc_prep.o
>   obj-ppc-y += ppc_oldworld.o
>   # NewWorld PowerMac
>   obj-ppc-y += ppc_newworld.o
> +# IBM pSeries (sPAPR)
> +obj-ppc-y += spapr.o spapr_hcall.o
>   # PowerPC 4xx boards
>   obj-ppc-y += ppc4xx_devs.o ppc4xx_pci.o ppc405_uc.o ppc405_boards.o
>   obj-ppc-y += ppc440.o ppc440_bamboo.o
> diff --git a/hw/spapr.c b/hw/spapr.c

[snip]

> +#endif /* !defined (__HW_SPAPR_H__) */
> diff --git a/hw/spapr_hcall.c b/hw/spapr_hcall.c
> new file mode 100644
> index 0000000..6ddac00
> --- /dev/null
> +++ b/hw/spapr_hcall.c

Missing license

> @@ -0,0 +1,43 @@
> +#include "sysemu.h"
> +#include "cpu.h"
> +#include "qemu-char.h"
> +#include "hw/spapr.h"
> +
> +struct hypercall {
> +    spapr_hcall_fn fn;
> +} hypercall_table[(MAX_HCALL_OPCODE / 4) + 1];
> +
> +void spapr_register_hypercall(target_ulong opcode, spapr_hcall_fn fn)
> +{
> +    struct hypercall *hc;
> +
> +    assert(opcode<= MAX_HCALL_OPCODE);
> +    assert((opcode&  0x3) == 0);
> +
> +    hc = hypercall_table + (opcode / 4);
> +
> +    assert(!hc->fn || (fn == hc->fn));
> +
> +    hc->fn = fn;
> +}
> +
> +target_ulong spapr_hypercall(CPUState *env, sPAPREnvironment *spapr,
> +                             target_ulong opcode, target_ulong *args)
> +{
> +    if (msr_pr) {
> +        fprintf(stderr, "Hypercall made with MSR=0x" TARGET_FMT_lx "\n",
> +                env->msr);
> +        return H_PRIVILEGE;
> +    }
> +
> +    if ((opcode<= MAX_HCALL_OPCODE)
> +&&  ((opcode&  0x3) == 0)) {
> +        struct hypercall *hc = hypercall_table + (opcode / 4);
> +
> +        if (hc->fn)

Braces

> +            return hc->fn(env, spapr, opcode, args);
> +    }
> +
> +    fprintf(stderr, "Unimplemented hcall 0x" TARGET_FMT_lx "\n", opcode);
> +    return H_FUNCTION;
> +}