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authorDavid Hildenbrand <dahi@linux.vnet.ibm.com>2014-09-30 10:57:28 +0200
committerCornelia Huck <cornelia.huck@de.ibm.com>2014-10-10 10:37:47 +0200
commit75973bfe415774babe7c1e18fa682c050fdce73b (patch)
tree87dbc972abc45d8225e6ff80a3c49645945ad159
parenta9fd16544dd3cdc50902ff652e2f57982f113497 (diff)
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s390x/kvm: introduce proper states for s390 cpus
Until now, when a s390 cpu was stopped or halted, the number of running CPUs was tracked in a global variable. This was problematic for migration, so Jason came up with a per-cpu running state. As it turns out, we want to track the full logical state of a target vcpu, so we need real s390 cpu states. This patch is based on an initial patch by Jason Herne, but was heavily rewritten when adding the cpu states STOPPED and OPERATING. On the way we move add_del_running to cpu.c (the declaration is already in cpu.h) and modify the users where appropriate. Please note that the cpu is still set to be stopped when it is halted, which is wrong. This will be fixed in the next patch. The LOAD and CHECK-STOP state will not be used in the first step. Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> [folded Jason's patch into David's patch to avoid add/remove same lines] Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com> CC: Andreas Faerber <afaerber@suse.de> Tested-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
-rw-r--r--hw/s390x/s390-virtio.c32
-rw-r--r--target-s390x/cpu.c43
-rw-r--r--target-s390x/cpu.h14
3 files changed, 57 insertions, 32 deletions
diff --git a/hw/s390x/s390-virtio.c b/hw/s390x/s390-virtio.c
index 9c61246..af0004a 100644
--- a/hw/s390x/s390-virtio.c
+++ b/hw/s390x/s390-virtio.c
@@ -125,38 +125,6 @@ static void s390_virtio_register_hcalls(void)
s390_virtio_hcall_set_status);
}
-/*
- * The number of running CPUs. On s390 a shutdown is the state of all CPUs
- * being either stopped or disabled (for interrupts) waiting. We have to
- * track this number to call the shutdown sequence accordingly. This
- * number is modified either on startup or while holding the big qemu lock.
- */
-static unsigned s390_running_cpus;
-
-void s390_add_running_cpu(S390CPU *cpu)
-{
- CPUState *cs = CPU(cpu);
-
- if (cs->halted) {
- s390_running_cpus++;
- cs->halted = 0;
- cs->exception_index = -1;
- }
-}
-
-unsigned s390_del_running_cpu(S390CPU *cpu)
-{
- CPUState *cs = CPU(cpu);
-
- if (cs->halted == 0) {
- assert(s390_running_cpus >= 1);
- s390_running_cpus--;
- cs->halted = 1;
- cs->exception_index = EXCP_HLT;
- }
- return s390_running_cpus;
-}
-
void s390_init_ipl_dev(const char *kernel_filename,
const char *kernel_cmdline,
const char *initrd_filename,
diff --git a/target-s390x/cpu.c b/target-s390x/cpu.c
index 2cfeb82..03cab74 100644
--- a/target-s390x/cpu.c
+++ b/target-s390x/cpu.c
@@ -229,6 +229,49 @@ static void s390_cpu_finalize(Object *obj)
#endif
}
+#if !defined(CONFIG_USER_ONLY)
+static unsigned s390_count_running_cpus(void)
+{
+ CPUState *cpu;
+ int nr_running = 0;
+
+ CPU_FOREACH(cpu) {
+ uint8_t state = S390_CPU(cpu)->env.cpu_state;
+ if (state == CPU_STATE_OPERATING ||
+ state == CPU_STATE_LOAD) {
+ nr_running++;
+ }
+ }
+
+ return nr_running;
+}
+
+void s390_add_running_cpu(S390CPU *cpu)
+{
+ CPUState *cs = CPU(cpu);
+
+ if (cs->halted) {
+ cpu->env.cpu_state = CPU_STATE_OPERATING;
+ cs->halted = 0;
+ cs->exception_index = -1;
+ }
+}
+
+unsigned s390_del_running_cpu(S390CPU *cpu)
+{
+ CPUState *cs = CPU(cpu);
+
+ if (cs->halted == 0) {
+ assert(s390_count_running_cpus() >= 1);
+ cpu->env.cpu_state = CPU_STATE_STOPPED;
+ cs->halted = 1;
+ cs->exception_index = EXCP_HLT;
+ }
+
+ return s390_count_running_cpus();
+}
+#endif
+
static const VMStateDescription vmstate_s390_cpu = {
.name = "cpu",
.unmigratable = 1,
diff --git a/target-s390x/cpu.h b/target-s390x/cpu.h
index 62940c3..f1a3ad2 100644
--- a/target-s390x/cpu.h
+++ b/target-s390x/cpu.h
@@ -141,6 +141,20 @@ typedef struct CPUS390XState {
QEMUTimer *tod_timer;
QEMUTimer *cpu_timer;
+
+ /*
+ * The cpu state represents the logical state of a cpu. In contrast to other
+ * architectures, there is a difference between a halt and a stop on s390.
+ * If all cpus are either stopped (including check stop) or in the disabled
+ * wait state, the vm can be shut down.
+ */
+#define CPU_STATE_UNINITIALIZED 0x00
+#define CPU_STATE_STOPPED 0x01
+#define CPU_STATE_CHECK_STOP 0x02
+#define CPU_STATE_OPERATING 0x03
+#define CPU_STATE_LOAD 0x04
+ uint8_t cpu_state;
+
} CPUS390XState;
#include "cpu-qom.h"