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[Qemu-devel] [PATCH v1 19/27] s390x/tcg: implement SIGP SENSE
From: |
David Hildenbrand |
Subject: |
[Qemu-devel] [PATCH v1 19/27] s390x/tcg: implement SIGP SENSE |
Date: |
Mon, 18 Sep 2017 18:00:04 +0200 |
Add it as preparation for TCG. Sensing coul later be done completely
lockless.
Signed-off-by: David Hildenbrand <address@hidden>
---
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;
--
2.13.5
- Re: [Qemu-devel] [PATCH v1 11/27] s390x/kvm: generalize SIGP stop and restart interrupt injection, (continued)
- [Qemu-devel] [PATCH v1 12/27] s390x/kvm: factor out storing of CPU status, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 15/27] s390x/kvm: drop two debug prints, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 13/27] target/s390x: proper cpu->be convertion in s390_store_status(), David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 14/27] s390x/kvm: factor out storing of adtl CPU status, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 17/27] s390x/kvm: factor out actual handling of STOP interrupts, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 19/27] s390x/tcg: implement SIGP SENSE,
David Hildenbrand <=
- [Qemu-devel] [PATCH v1 21/27] s390x/tcg: implement SIGP EMERGENCY SIGNAL, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 16/27] s390x/kvm: factor out SIGP code into sigp.c, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 18/27] s390x/tcg: implement SIGP SENSE RUNNING STATUS, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 20/27] s390x/tcg: implement SIGP EXTERNAL CALL, David Hildenbrand, 2017/09/18
- [Qemu-devel] [PATCH v1 22/27] s390x/tcg: implement SIGP CONDITIONAL EMERGENCY SIGNAL, David Hildenbrand, 2017/09/18