Commit 59760f2d authored by Alexey Kardashevskiy's avatar Alexey Kardashevskiy Committed by Alexander Graf
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spapr: add "stop-self" RTAS call required to support hot CPU unplug 



PAPR+ requires two RTAS calls to be supported by the hypervisor in
order to allow hotplugging VCPUs from the guest. The "start-cpu" RTAS
call was already there but "stop-self" was not.

This adds the "stop-self" RTAS call.

Signed-off-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: default avatarAlexander Graf <agraf@suse.de>
parent 7bb438b6

hw/ppc/spapr_rtas.c

+23 −0
Original line number Diff line number Diff line
@@ -202,6 +202,28 @@ static void rtas_start_cpu(PowerPCCPU *cpu_, sPAPREnvironment *spapr, 
    rtas_st(rets, 0, -3);

}



static void rtas_stop_self(PowerPCCPU *cpu, sPAPREnvironment *spapr,

                           uint32_t token, uint32_t nargs,

                           target_ulong args,

                           uint32_t nret, target_ulong rets)

{

    CPUState *cs = CPU(cpu);

    CPUPPCState *env = &cpu->env;



    cs->halted = 1;

    cpu_exit(cs);

    /*

     * While stopping a CPU, the guest calls H_CPPR which

     * effectively disables interrupts on XICS level.

     * However decrementer interrupts in TCG can still

     * wake the CPU up so here we disable interrupts in MSR

     * as well.

     * As rtas_start_cpu() resets the whole MSR anyway, there is

     * no need to bother with specific bits, we just clear it.

     */

    env->msr = 0;

}



static struct rtas_call {

    const char *name;

    spapr_rtas_fn fn;
@@ -322,6 +344,7 @@ static void core_rtas_register_types(void) 
    spapr_rtas_register("query-cpu-stopped-state",

                        rtas_query_cpu_stopped_state);

    spapr_rtas_register("start-cpu", rtas_start_cpu);

    spapr_rtas_register("stop-self", rtas_stop_self);

}



type_init(core_rtas_register_types)