Replace the ad-hoc qemu_tcg_configure with generic code invoking
QOM property getters and setters. This will be extended in the
next patches, which will turn accelerator-related "-machine"
options into QOM properties as well.
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
accel/tcg/tcg-all.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++-
cpus.c | 72 --------------------------------
include/sysemu/cpus.h | 2 -
vl.c | 32 ++++++++-------
4 files changed, 126 insertions(+), 91 deletions(-)
diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c
index c59d5b0..7829f02 100644
--- a/accel/tcg/tcg-all.c
+++ b/accel/tcg/tcg-all.c
@@ -30,6 +30,21 @@
#include "cpu.h"
#include "sysemu/cpus.h"
#include "qemu/main-loop.h"
+#include "tcg/tcg.h"
+#include "include/qapi/error.h"
+#include "include/qemu/error-report.h"
+#include "include/hw/boards.h"
+
+typedef struct TCGState {
+ AccelState parent_obj;
+
+ bool mttcg_enabled;
+} TCGState;
+
+#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
+
+#define TCG_STATE(obj) \
+ OBJECT_CHECK(TCGState, (obj), TYPE_TCG_ACCEL)
unsigned long tcg_tb_size;
@@ -58,27 +73,119 @@ static void tcg_handle_interrupt(CPUState *cpu, int mask)
}
}
+/*
+ * We default to false if we know other options have been enabled
+ * which are currently incompatible with MTTCG. Otherwise when each
+ * guest (target) has been updated to support:
+ * - atomic instructions
+ * - memory ordering primitives (barriers)
+ * they can set the appropriate CONFIG flags in ${target}-softmmu.mak
+ *
+ * Once a guest architecture has been converted to the new primitives
+ * there are two remaining limitations to check.
+ *
+ * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host)
+ * - The host must have a stronger memory order than the guest
+ *
+ * It may be possible in future to support strong guests on weak hosts
+ * but that will require tagging all load/stores in a guest with their
+ * implicit memory order requirements which would likely slow things
+ * down a lot.
+ */
+
+static bool check_tcg_memory_orders_compatible(void)
+{
+#if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO)
+ return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0;
+#else
+ return false;
+#endif
+}
+
+static bool default_mttcg_enabled(void)
+{
+ if (use_icount || TCG_OVERSIZED_GUEST) {
+ return false;
+ } else {
+#ifdef TARGET_SUPPORTS_MTTCG
+ return check_tcg_memory_orders_compatible();
+#else
+ return false;
+#endif
+ }
+}
+
+static void tcg_accel_instance_init(Object *obj)
+{
+ TCGState *s = TCG_STATE(obj);
+
+ s->mttcg_enabled = default_mttcg_enabled();
+}
+
static int tcg_init(MachineState *ms)
{
+ TCGState *s = TCG_STATE(current_machine->accelerator);
+
tcg_exec_init(tcg_tb_size * 1024 * 1024);
cpu_interrupt_handler = tcg_handle_interrupt;
+ mttcg_enabled = s->mttcg_enabled;
return 0;
}
+static char *tcg_get_thread(Object *obj, Error **errp)
+{
+ TCGState *s = TCG_STATE(obj);
+
+ return g_strdup(s->mttcg_enabled ? "multi" : "single");
+}
+
+static void tcg_set_thread(Object *obj, const char *value, Error **errp)
+{
+ TCGState *s = TCG_STATE(obj);
+
+ if (strcmp(value, "multi") == 0) {
+ if (TCG_OVERSIZED_GUEST) {
+ error_setg(errp, "No MTTCG when guest word size > hosts");
+ } else if (use_icount) {
+ error_setg(errp, "No MTTCG when icount is enabled");
+ } else {
+#ifndef TARGET_SUPPORTS_MTTCG
+ warn_report("Guest not yet converted to MTTCG - "
+ "you may get unexpected results");
+#endif
+ if (!check_tcg_memory_orders_compatible()) {
+ warn_report("Guest expects a stronger memory ordering "
+ "than the host provides");
+ error_printf("This may cause strange/hard to debug errors\n");
+ }
+ s->mttcg_enabled = true;
+ }
+ } else if (strcmp(value, "single") == 0) {
+ s->mttcg_enabled = false;
+ } else {
+ error_setg(errp, "Invalid 'thread' setting %s", value);
+ }
+}
+
static void tcg_accel_class_init(ObjectClass *oc, void *data)
{
AccelClass *ac = ACCEL_CLASS(oc);
ac->name = "tcg";
ac->init_machine = tcg_init;
ac->allowed = &tcg_allowed;
-}
-#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
+ object_class_property_add_str(oc, "thread",
+ tcg_get_thread,
+ tcg_set_thread,
+ NULL);
+}
static const TypeInfo tcg_accel_type = {
.name = TYPE_TCG_ACCEL,
.parent = TYPE_ACCEL,
+ .instance_init = tcg_accel_instance_init,
.class_init = tcg_accel_class_init,
+ .instance_size = sizeof(TCGState),
};
static void register_accel_types(void)
diff --git a/cpus.c b/cpus.c
index fabbeca..69d4f6a 100644
--- a/cpus.c
+++ b/cpus.c
@@ -165,78 +165,6 @@ typedef struct TimersState {
static TimersState timers_state;
bool mttcg_enabled;
-/*
- * We default to false if we know other options have been enabled
- * which are currently incompatible with MTTCG. Otherwise when each
- * guest (target) has been updated to support:
- * - atomic instructions
- * - memory ordering primitives (barriers)
- * they can set the appropriate CONFIG flags in ${target}-softmmu.mak
- *
- * Once a guest architecture has been converted to the new primitives
- * there are two remaining limitations to check.
- *
- * - The guest can't be oversized (e.g. 64 bit guest on 32 bit host)
- * - The host must have a stronger memory order than the guest
- *
- * It may be possible in future to support strong guests on weak hosts
- * but that will require tagging all load/stores in a guest with their
- * implicit memory order requirements which would likely slow things
- * down a lot.
- */
-
-static bool check_tcg_memory_orders_compatible(void)
-{
-#if defined(TCG_GUEST_DEFAULT_MO) && defined(TCG_TARGET_DEFAULT_MO)
- return (TCG_GUEST_DEFAULT_MO & ~TCG_TARGET_DEFAULT_MO) == 0;
-#else
- return false;
-#endif
-}
-
-static bool default_mttcg_enabled(void)
-{
- if (use_icount || TCG_OVERSIZED_GUEST) {
- return false;
- } else {
-#ifdef TARGET_SUPPORTS_MTTCG
- return check_tcg_memory_orders_compatible();
-#else
- return false;
-#endif
- }
-}
-
-void qemu_tcg_configure(QemuOpts *opts, Error **errp)
-{
- const char *t = qemu_opt_get(opts, "thread");
- if (t) {
- if (strcmp(t, "multi") == 0) {
- if (TCG_OVERSIZED_GUEST) {
- error_setg(errp, "No MTTCG when guest word size > hosts");
- } else if (use_icount) {
- error_setg(errp, "No MTTCG when icount is enabled");
- } else {
-#ifndef TARGET_SUPPORTS_MTTCG
- warn_report("Guest not yet converted to MTTCG - "
- "you may get unexpected results");
-#endif
- if (!check_tcg_memory_orders_compatible()) {
- warn_report("Guest expects a stronger memory ordering "
- "than the host provides");
- error_printf("This may cause strange/hard to debug
errors\n");
- }
- mttcg_enabled = true;
- }
- } else if (strcmp(t, "single") == 0) {
- mttcg_enabled = false;
- } else {
- error_setg(errp, "Invalid 'thread' setting %s", t);
- }
- } else {
- mttcg_enabled = default_mttcg_enabled();
- }
-}
/* The current number of executed instructions is based on what we
* originally budgeted minus the current state of the decrementing
diff --git a/include/sysemu/cpus.h b/include/sysemu/cpus.h
index 32c05f2..3c1da6a 100644
--- a/include/sysemu/cpus.h
+++ b/include/sysemu/cpus.h
@@ -40,6 +40,4 @@ extern int smp_threads;
void list_cpus(const char *optarg);
-void qemu_tcg_configure(QemuOpts *opts, Error **errp);
-
#endif
diff --git a/vl.c b/vl.c
index c8ec906..2ea94c7 100644
--- a/vl.c
+++ b/vl.c
@@ -294,17 +294,12 @@ static QemuOptsList qemu_accel_opts = {
.implied_opt_name = "accel",
.head = QTAILQ_HEAD_INITIALIZER(qemu_accel_opts.head),
.desc = {
- {
- .name = "accel",
- .type = QEMU_OPT_STRING,
- .help = "Select the type of accelerator",
- },
- {
- .name = "thread",
- .type = QEMU_OPT_STRING,
- .help = "Enable/disable multi-threaded TCG",
- },
- { /* end of list */ }
+ /*
+ * no elements => accept any
+ * sanity checking will happen later
+ * when setting accelerator properties
+ */
+ { }
},
};
@@ -2841,6 +2836,13 @@ static int do_configure_icount(void *opaque, QemuOpts
*opts, Error **errp)
return 0;
}
+static int accelerator_set_property(void *opaque,
+ const char *name, const char *value,
+ Error **errp)
+{
+ return object_parse_property_opt(opaque, name, value, "accel", errp);
+}
+
static int do_configure_accelerator(void *opaque, QemuOpts *opts, Error **errp)
{
bool *p_init_failed = opaque;
@@ -2855,6 +2857,10 @@ static int do_configure_accelerator(void *opaque,
QemuOpts *opts, Error **errp)
return 0;
}
accel = ACCEL(object_new_with_class(OBJECT_CLASS(ac)));
+ qemu_opt_foreach(opts, accelerator_set_property,
+ accel,
+ &error_fatal);
+
ret = accel_init_machine(accel, current_machine);
if (ret < 0) {
*p_init_failed = true;
@@ -2862,10 +2868,6 @@ static int do_configure_accelerator(void *opaque,
QemuOpts *opts, Error **errp)
acc, strerror(-ret));
return 0;
}
-
- if (tcg_enabled()) {
- qemu_tcg_configure(opts, &error_fatal);
- }
return 1;
}
--
1.8.3.1
