From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:58880) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1e5Vtk-0002r8-RC for qemu-devel@nongnu.org; Fri, 20 Oct 2017 07:55:33 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1e5Vtj-0003Ql-JC for qemu-devel@nongnu.org; Fri, 20 Oct 2017 07:55:32 -0400 From: Cornelia Huck Date: Fri, 20 Oct 2017 13:53:53 +0200 Message-Id: <20171020115418.2050-22-cohuck@redhat.com> In-Reply-To: <20171020115418.2050-1-cohuck@redhat.com> References: <20171020115418.2050-1-cohuck@redhat.com> Subject: [Qemu-devel] [PULL 21/46] s390x/tcg: implement SIGP SENSE List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: peter.maydell@linaro.org Cc: qemu-devel@nongnu.org, qemu-s390x@nongnu.org, rth@twiddle.net, agraf@suse.de, thuth@redhat.com, borntraeger@de.ibm.com, david@redhat.com, Cornelia Huck From: David Hildenbrand 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; -- 2.13.6