From 302230fc449a5778dfb703e7fc2f2bdfe71dcd9d Mon Sep 17 00:00:00 2001 From: David Hildenbrand Date: Thu, 28 Sep 2017 22:36:58 +0200 Subject: [PATCH] s390x/tcg: implement SIGP SENSE Add it as preparation for TCG. Sensing could later be done completely lockless. Signed-off-by: David Hildenbrand Message-Id: <20170928203708.9376-21-david@redhat.com> Reviewed-by: Richard Henderson Signed-off-by: Cornelia Huck --- target/s390x/sigp.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/target/s390x/sigp.c b/target/s390x/sigp.c index c57312b743..063a34ccc7 100644 --- a/target/s390x/sigp.c +++ b/target/s390x/sigp.c @@ -32,6 +32,32 @@ static void set_sigp_status(SigpInfo *si, uint64_t status) 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) { S390CPU *cpu = S390_CPU(cs); @@ -277,6 +303,9 @@ static int handle_sigp_single_dst(S390CPU *dst_cpu, uint8_t order, } switch (order) { + case SIGP_SENSE: + sigp_sense(dst_cpu, &si); + break; case SIGP_START: run_on_cpu(CPU(dst_cpu), sigp_start, RUN_ON_CPU_HOST_PTR(&si)); break; -- 2.39.2