From 15af83ccafc175c7a61d39f998ac7eb43829e53c Mon Sep 17 00:00:00 2001
From: David Hildenbrand <david@redhat.com>
Date: Fri, 21 Dec 2018 15:36:07 +0000
Subject: [PATCH 05/22] s390x/tcg: properly implement the TOD
RH-Author: David Hildenbrand <david@redhat.com>
Message-id: <20181221153614.27961-6-david@redhat.com>
Patchwork-id: 83751
O-Subject: [RHEL-8.0 qemu-kvm v2 PATCH 05/12] s390x/tcg: properly implement the TOD
Bugzilla: 1653569
RH-Acked-by: Cornelia Huck <cohuck@redhat.com>
RH-Acked-by: Thomas Huth <thuth@redhat.com>
RH-Acked-by: Laurent Vivier <lvivier@redhat.com>
Right now, each CPU has its own TOD. Especially, the TOD will differ
based on creation time of a CPU - e.g. when hotplugging a CPU the times
will differ quite a lot, resulting in stall warnings in the guest.
Let's use a single TOD by implementing our new TOD device. Prepare it
for TOD-clock epoch extension.
Most importantly, whenever we set the TOD, we have to update the CKC
timer.
Introduce "tcg_s390x.h" just like "kvm_s390x.h" for tcg specific
function declarations that should not go into cpu.h.
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20180627134410.4901-6-david@redhat.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 7de3b1cdc67dcb572c1761c2051252e91a438b22)
Signed-off-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
---
hw/s390x/tod-qemu.c | 46 ++++++++++++++++++++++++++++++++++++++++++----
hw/s390x/tod.c | 11 +++++++++++
include/hw/s390x/tod.h | 19 +++++++++++++++++++
target/s390x/cpu.c | 7 -------
target/s390x/cpu.h | 1 -
target/s390x/internal.h | 16 ----------------
target/s390x/misc_helper.c | 25 +++++++++++++++++++------
target/s390x/tcg_s390x.h | 18 ++++++++++++++++++
8 files changed, 109 insertions(+), 34 deletions(-)
create mode 100644 target/s390x/tcg_s390x.h
diff --git a/hw/s390x/tod-qemu.c b/hw/s390x/tod-qemu.c
index 03ea1ce..59c015c 100644
--- a/hw/s390x/tod-qemu.c
+++ b/hw/s390x/tod-qemu.c
@@ -11,19 +11,43 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "hw/s390x/tod.h"
+#include "qemu/timer.h"
+#include "qemu/cutils.h"
+#include "cpu.h"
+#include "tcg_s390x.h"
static void qemu_s390_tod_get(const S390TODState *td, S390TOD *tod,
Error **errp)
{
- /* FIXME */
- tod->high = 0;
- tod->low = 0;
+ *tod = td->base;
+
+ tod->low += time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+ if (tod->low < td->base.low) {
+ tod->high++;
+ }
}
static void qemu_s390_tod_set(S390TODState *td, const S390TOD *tod,
Error **errp)
{
- /* FIXME */
+ CPUState *cpu;
+
+ td->base = *tod;
+
+ td->base.low -= time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
+ if (td->base.low > tod->low) {
+ td->base.high--;
+ }
+
+ /*
+ * The TOD has been changed and we have to recalculate the CKC values
+ * for all CPUs. We do this asynchronously, as "SET CLOCK should be
+ * issued only while all other activity on all CPUs .. has been
+ * suspended".
+ */
+ CPU_FOREACH(cpu) {
+ async_run_on_cpu(cpu, tcg_s390_tod_updated, RUN_ON_CPU_NULL);
+ }
}
static void qemu_s390_tod_class_init(ObjectClass *oc, void *data)
@@ -34,10 +58,24 @@ static void qemu_s390_tod_class_init(ObjectClass *oc, void *data)
tdc->set = qemu_s390_tod_set;
}
+static void qemu_s390_tod_init(Object *obj)
+{
+ S390TODState *td = S390_TOD(obj);
+ struct tm tm;
+
+ qemu_get_timedate(&tm, 0);
+ td->base.high = 0;
+ td->base.low = TOD_UNIX_EPOCH + (time2tod(mktimegm(&tm)) * 1000000000ULL);
+ if (td->base.low < TOD_UNIX_EPOCH) {
+ td->base.high += 1;
+ }
+}
+
static TypeInfo qemu_s390_tod_info = {
.name = TYPE_QEMU_S390_TOD,
.parent = TYPE_S390_TOD,
.instance_size = sizeof(S390TODState),
+ .instance_init = qemu_s390_tod_init,
.class_init = qemu_s390_tod_class_init,
.class_size = sizeof(S390TODClass),
};
diff --git a/hw/s390x/tod.c b/hw/s390x/tod.c
index 0501aff..1c63f41 100644
--- a/hw/s390x/tod.c
+++ b/hw/s390x/tod.c
@@ -30,6 +30,17 @@ void s390_init_tod(void)
qdev_init_nofail(DEVICE(obj));
}
+S390TODState *s390_get_todstate(void)
+{
+ static S390TODState *ts;
+
+ if (!ts) {
+ ts = S390_TOD(object_resolve_path_type("", TYPE_S390_TOD, NULL));
+ }
+
+ return ts;
+}
+
#define S390_TOD_CLOCK_VALUE_MISSING 0x00
#define S390_TOD_CLOCK_VALUE_PRESENT 0x01
diff --git a/include/hw/s390x/tod.h b/include/hw/s390x/tod.h
index 7096b57..413c0d7 100644
--- a/include/hw/s390x/tod.h
+++ b/include/hw/s390x/tod.h
@@ -30,6 +30,9 @@ typedef struct S390TOD {
typedef struct S390TODState {
/* private */
DeviceState parent_obj;
+
+ /* unused by KVM implementation */
+ S390TOD base;
} S390TODState;
typedef struct S390TODClass {
@@ -41,6 +44,22 @@ typedef struct S390TODClass {
void (*set)(S390TODState *td, const S390TOD *tod, Error **errp);
} S390TODClass;
+/* The value of the TOD clock for 1.1.1970. */
+#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
+
+/* Converts ns to s390's clock format */
+static inline uint64_t time2tod(uint64_t ns)
+{
+ return (ns << 9) / 125 + (((ns & 0xff10000000000000ull) / 125) << 9);
+}
+
+/* Converts s390's clock format to ns */
+static inline uint64_t tod2time(uint64_t t)
+{
+ return ((t >> 9) * 125) + (((t & 0x1ff) * 125) >> 9);
+}
+
void s390_init_tod(void);
+S390TODState *s390_get_todstate(void);
#endif
diff --git a/target/s390x/cpu.c b/target/s390x/cpu.c
index 5570741..f74d2a3 100644
--- a/target/s390x/cpu.c
+++ b/target/s390x/cpu.c
@@ -30,7 +30,6 @@
#include "kvm_s390x.h"
#include "sysemu/kvm.h"
#include "qemu-common.h"
-#include "qemu/cutils.h"
#include "qemu/timer.h"
#include "qemu/error-report.h"
#include "trace.h"
@@ -276,9 +275,6 @@ static void s390_cpu_initfn(Object *obj)
CPUState *cs = CPU(obj);
S390CPU *cpu = S390_CPU(obj);
CPUS390XState *env = &cpu->env;
-#if !defined(CONFIG_USER_ONLY)
- struct tm tm;
-#endif
cs->env_ptr = env;
cs->halted = 1;
@@ -287,9 +283,6 @@ static void s390_cpu_initfn(Object *obj)
s390_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
s390_cpu_model_register_props(obj);
#if !defined(CONFIG_USER_ONLY)
- qemu_get_timedate(&tm, 0);
- env->tod_offset = TOD_UNIX_EPOCH +
- (time2tod(mktimegm(&tm)) * 1000000000ULL);
env->tod_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_tod_timer, cpu);
env->cpu_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL, s390x_cpu_timer, cpu);
s390_cpu_set_state(S390_CPU_STATE_STOPPED, cpu);
diff --git a/target/s390x/cpu.h b/target/s390x/cpu.h
index 04f9adf..6500f42 100644
--- a/target/s390x/cpu.h
+++ b/target/s390x/cpu.h
@@ -133,7 +133,6 @@ struct CPUS390XState {
uint64_t cpuid;
#endif
- uint64_t tod_offset;
QEMUTimer *tod_timer;
QEMUTimer *cpu_timer;
diff --git a/target/s390x/internal.h b/target/s390x/internal.h
index d1ed06f..61a509d 100644
--- a/target/s390x/internal.h
+++ b/target/s390x/internal.h
@@ -237,22 +237,6 @@ enum cc_op {
CC_OP_MAX
};
-/* The value of the TOD clock for 1.1.1970. */
-#define TOD_UNIX_EPOCH 0x7d91048bca000000ULL
-
-/* Converts ns to s390's clock format */
-static inline uint64_t time2tod(uint64_t ns)
-{
- return (ns << 9) / 125 + (((ns & 0xff10000000000000ull) / 125) << 9);
-
-}
-
-/* Converts s390's clock format to ns */
-static inline uint64_t tod2time(uint64_t t)
-{
- return ((t >> 9) * 125) + (((t & 0x1ff) * 125) >> 9);
-}
-
static inline hwaddr decode_basedisp_s(CPUS390XState *env, uint32_t ipb,
uint8_t *ar)
{
diff --git a/target/s390x/misc_helper.c b/target/s390x/misc_helper.c
index 8b3b040..4f675c7 100644
--- a/target/s390x/misc_helper.c
+++ b/target/s390x/misc_helper.c
@@ -29,6 +29,8 @@
#include "exec/address-spaces.h"
#include "exec/exec-all.h"
#include "exec/cpu_ldst.h"
+#include "qapi/error.h"
+#include "tcg_s390x.h"
#if !defined(CONFIG_USER_ONLY)
#include "sysemu/cpus.h"
@@ -40,6 +42,7 @@
#include "hw/s390x/ioinst.h"
#include "hw/s390x/s390-pci-inst.h"
#include "hw/boards.h"
+#include "hw/s390x/tod.h"
#endif
/* #define DEBUG_HELPER */
@@ -139,17 +142,19 @@ void HELPER(spx)(CPUS390XState *env, uint64_t a1)
/* Store Clock */
uint64_t HELPER(stck)(CPUS390XState *env)
{
- uint64_t time;
+ S390TODState *td = s390_get_todstate();
+ S390TODClass *tdc = S390_TOD_GET_CLASS(td);
+ S390TOD tod;
- time = env->tod_offset +
- time2tod(qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL));
-
- return time;
+ tdc->get(td, &tod, &error_abort);
+ return tod.low;
}
/* Set Clock Comparator */
void HELPER(sckc)(CPUS390XState *env, uint64_t time)
{
+ S390TODState *td = s390_get_todstate();
+
if (time == -1ULL) {
return;
}
@@ -157,7 +162,7 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t time)
env->ckc = time;
/* difference between origins */
- time -= env->tod_offset;
+ time -= td->base.low;
/* nanoseconds */
time = tod2time(time);
@@ -165,6 +170,14 @@ void HELPER(sckc)(CPUS390XState *env, uint64_t time)
timer_mod(env->tod_timer, time);
}
+void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data opaque)
+{
+ S390CPU *cpu = S390_CPU(cs);
+ CPUS390XState *env = &cpu->env;
+
+ helper_sckc(env, env->ckc);
+}
+
/* Set Tod Programmable Field */
void HELPER(sckpf)(CPUS390XState *env, uint64_t r0)
{
diff --git a/target/s390x/tcg_s390x.h b/target/s390x/tcg_s390x.h
new file mode 100644
index 0000000..4e308aa
--- /dev/null
+++ b/target/s390x/tcg_s390x.h
@@ -0,0 +1,18 @@
+/*
+ * QEMU TCG support -- s390x specific functions.
+ *
+ * Copyright 2018 Red Hat, Inc.
+ *
+ * Authors:
+ * David Hildenbrand <david@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#ifndef TCG_S390X_H
+#define TCG_S390X_H
+
+void tcg_s390_tod_updated(CPUState *cs, run_on_cpu_data opaque);
+
+#endif /* TCG_S390X_H */
--
1.8.3.1