Commit 302230fc authored by David Hildenbrand's avatar David Hildenbrand Committed by Cornelia Huck
Browse files

s390x/tcg: implement SIGP SENSE 



Add it as preparation for TCG. Sensing could later be done completely
lockless.

Signed-off-by: default avatarDavid Hildenbrand <david@redhat.com>
Message-Id: <20170928203708.9376-21-david@redhat.com>
Reviewed-by: default avatarRichard Henderson <richard.henderson@linaro.org>
Signed-off-by: default avatarCornelia Huck <cohuck@redhat.com>
parent d1b468bc

target/s390x/sigp.c

+29 −0
Original line number Original line Diff line number Diff line
@@ -32,6 +32,32 @@ static void set_sigp_status(SigpInfo *si, uint64_t status) 
    si->cc = SIGP_CC_STATUS_STORED;

    si->cc = SIGP_CC_STATUS_STORED;

}

}





static void sigp_sense(S390CPU *dst_cpu, SigpInfo *si)

{

    uint8_t state = s390_cpu_get_state(dst_cpu);

    bool ext_call = dst_cpu->env.pending_int & INTERRUPT_EXTERNAL_CALL;

    uint64_t status = 0;



    if (!tcg_enabled()) {

        /* handled in KVM */

        set_sigp_status(si, SIGP_STAT_INVALID_ORDER);

        return;

    }



    /* sensing without locks is racy, but it's the same for real hw */

    if (state != CPU_STATE_STOPPED && !ext_call) {

        si->cc = SIGP_CC_ORDER_CODE_ACCEPTED;

    } else {

        if (ext_call) {

            status |= SIGP_STAT_EXT_CALL_PENDING;

        }

        if (state == CPU_STATE_STOPPED) {

            status |= SIGP_STAT_STOPPED;

        }

        set_sigp_status(si, status);

    }

}



static void sigp_start(CPUState *cs, run_on_cpu_data arg)

static void sigp_start(CPUState *cs, run_on_cpu_data arg)

{

{

    S390CPU *cpu = S390_CPU(cs);

    S390CPU *cpu = S390_CPU(cs);
@@ -277,6 +303,9 @@ static int handle_sigp_single_dst(S390CPU *dst_cpu, uint8_t order, 
    }

    }





    switch (order) {

    switch (order) {

    case SIGP_SENSE:

        sigp_sense(dst_cpu, &si);

        break;

    case SIGP_START:

    case SIGP_START:

        run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si));

        run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si));

        break;

        break;