accel: extend AccelState and AccelClass to user-mode

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>

[claudio: rebased on Richard's splitwx work]

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Message-Id: <20210204163931.7358-17-cfontana@suse.de>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

MAINTAINERS

@@ -438,7 +438,7 @@ Overall
 M: Richard Henderson <richard.henderson@linaro.org>
 R: Paolo Bonzini <pbonzini@redhat.com>
 S: Maintained
-F: include/sysemu/accel.h
+F: include/qemu/accel.h
 F: accel/accel.c
 F: accel/Makefile.objs
 F: accel/stubs/Makefile.objs

accel/accel-common.c

@@ -0,0 +1,50 @@
+/*
+ * QEMU accel class, components common to system emulation and user mode
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/accel.h"
+
+static const TypeInfo accel_type = {
+    .name = TYPE_ACCEL,
+    .parent = TYPE_OBJECT,
+    .class_size = sizeof(AccelClass),
+    .instance_size = sizeof(AccelState),
+};
+
+/* Lookup AccelClass from opt_name. Returns NULL if not found */
+AccelClass *accel_find(const char *opt_name)
+{
+    char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
+    AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
+    g_free(class_name);
+    return ac;
+}
+
+static void register_accel_types(void)
+{
+    type_register_static(&accel_type);
+}
+
+type_init(register_accel_types);

accel/accel-softmmu.c

@@ -1,5 +1,5 @@
 /*
- * QEMU System Emulator, accelerator interfaces
+ * QEMU accel class, system emulation components
  *
  * Copyright (c) 2003-2008 Fabrice Bellard
  * Copyright (c) 2014 Red Hat Inc.
@@ -24,28 +24,12 @@
  */
 
 #include "qemu/osdep.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "hw/boards.h"
 #include "sysemu/arch_init.h"
 #include "sysemu/sysemu.h"
 #include "qom/object.h"
 
-static const TypeInfo accel_type = {
-    .name = TYPE_ACCEL,
-    .parent = TYPE_OBJECT,
-    .class_size = sizeof(AccelClass),
-    .instance_size = sizeof(AccelState),
-};
-
-/* Lookup AccelClass from opt_name. Returns NULL if not found */
-AccelClass *accel_find(const char *opt_name)
-{
-    char *class_name = g_strdup_printf(ACCEL_CLASS_NAME("%s"), opt_name);
-    AccelClass *ac = ACCEL_CLASS(object_class_by_name(class_name));
-    g_free(class_name);
-    return ac;
-}
-
 int accel_init_machine(AccelState *accel, MachineState *ms)
 {
     AccelClass *acc = ACCEL_GET_CLASS(accel);
@@ -76,10 +60,3 @@ void accel_setup_post(MachineState *ms)
         acc->setup_post(ms, accel);
     }
 }
-
-static void register_accel_types(void)
-{
-    type_register_static(&accel_type);
-}
-
-type_init(register_accel_types);

accel/accel-user.c

@@ -0,0 +1,24 @@
+/*
+ * QEMU accel class, user-mode components
+ *
+ * Copyright 2021 SUSE LLC
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/accel.h"
+
+AccelState *current_accel(void)
+{
+    static AccelState *accel;
+
+    if (!accel) {
+        AccelClass *ac = accel_find("tcg");
+
+        g_assert(ac != NULL);
+        accel = ACCEL(object_new_with_class(OBJECT_CLASS(ac)));
+    }
+    return accel;
+}

accel/meson.build

@@ -1,4 +1,6 @@
-softmmu_ss.add(files('accel.c'))
+specific_ss.add(files('accel-common.c'))
+softmmu_ss.add(files('accel-softmmu.c'))
+user_ss.add(files('accel-user.c'))
 
 subdir('qtest')
 subdir('kvm')

accel/qtest/qtest.c

@@ -17,7 +17,7 @@
 #include "qemu/module.h"
 #include "qemu/option.h"
 #include "qemu/config-file.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/qtest.h"
 #include "sysemu/cpus.h"
 #include "sysemu/cpu-timers.h"

accel/tcg/meson.build

@@ -1,5 +1,6 @@
 tcg_ss = ss.source_set()
 tcg_ss.add(files(
+  'tcg-all.c',
   'cpu-exec-common.c',
   'cpu-exec.c',
   'tcg-runtime-gvec.c',
@@ -13,7 +14,6 @@ tcg_ss.add(when: 'CONFIG_PLUGIN', if_true: [files('plugin-gen.c'), libdl])
 specific_ss.add_all(when: 'CONFIG_TCG', if_true: tcg_ss)
 
 specific_ss.add(when: ['CONFIG_SOFTMMU', 'CONFIG_TCG'], if_true: files(
-  'tcg-all.c',
   'cputlb.c',
   'tcg-cpus.c',
   'tcg-cpus-mttcg.c',

accel/tcg/tcg-all.c

@@ -30,9 +30,12 @@
 #include "tcg/tcg.h"
 #include "qapi/error.h"
 #include "qemu/error-report.h"
-#include "hw/boards.h"
+#include "qemu/accel.h"
 #include "qapi/qapi-builtin-visit.h"
+
+#ifndef CONFIG_USER_ONLY
 #include "tcg-cpus.h"
+#endif /* CONFIG_USER_ONLY */
 
 struct TCGState {
     AccelState parent_obj;
@@ -97,7 +100,7 @@ static void tcg_accel_instance_init(Object *obj)
     s->mttcg_enabled = default_mttcg_enabled();
 
     /* If debugging enabled, default "auto on", otherwise off. */
-#ifdef CONFIG_DEBUG_TCG
+#if defined(CONFIG_DEBUG_TCG) && !defined(CONFIG_USER_ONLY)
     s->splitwx_enabled = -1;
 #else
     s->splitwx_enabled = 0;
@@ -114,8 +117,12 @@ static int tcg_init(MachineState *ms)
     mttcg_enabled = s->mttcg_enabled;
 
     /*
-     * Initialize TCG regions
+     * Initialize TCG regions only for softmmu.
+     *
+     * This needs to be done later for user mode, because the prologue
+     * generation needs to be delayed so that GUEST_BASE is already set.
      */
+#ifndef CONFIG_USER_ONLY
     tcg_region_init();
 
     if (mttcg_enabled) {
@@ -125,6 +132,8 @@ static int tcg_init(MachineState *ms)
     } else {
         cpus_register_accel(&tcg_cpus_rr);
     }
+#endif /* !CONFIG_USER_ONLY */
+
     return 0;
 }
 

accel/xen/xen-all.c

@@ -15,7 +15,7 @@
 #include "hw/xen/xen-legacy-backend.h"
 #include "hw/xen/xen_pt.h"
 #include "chardev/char.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/cpus.h"
 #include "sysemu/xen.h"
 #include "sysemu/runstate.h"

bsd-user/main.c

@@ -20,6 +20,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu/units.h"
+#include "qemu/accel.h"
 #include "sysemu/tcg.h"
 #include "qemu-version.h"
 #include <machine/trap.h>
@@ -909,8 +910,11 @@ int main(int argc, char **argv)
     }
 
     /* init tcg before creating CPUs and to get qemu_host_page_size */
-    tcg_exec_init(0, false);
+    {
+        AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 
+        ac->init_machine(NULL);
+    }
     cpu_type = parse_cpu_option(cpu_model);
     cpu = cpu_create(cpu_type);
     env = cpu->env_ptr;

include/hw/boards.h

@@ -6,7 +6,7 @@
 #include "exec/memory.h"
 #include "sysemu/hostmem.h"
 #include "sysemu/blockdev.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "qapi/qapi-types-machine.h"
 #include "qemu/module.h"
 #include "qom/object.h"

include/qemu/accel.h

@@ -20,8 +20,8 @@
  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  * THE SOFTWARE.
  */
-#ifndef HW_ACCEL_H
-#define HW_ACCEL_H
+#ifndef QEMU_ACCEL_H
+#define QEMU_ACCEL_H
 
 #include "qom/object.h"
 #include "exec/hwaddr.h"
@@ -37,8 +37,8 @@ typedef struct AccelClass {
     /*< public >*/
 
     const char *name;
-#ifndef CONFIG_USER_ONLY
     int (*init_machine)(MachineState *ms);
+#ifndef CONFIG_USER_ONLY
     void (*setup_post)(MachineState *ms, AccelState *accel);
     bool (*has_memory)(MachineState *ms, AddressSpace *as,
                        hwaddr start_addr, hwaddr size);
@@ -67,11 +67,13 @@ typedef struct AccelClass {
     OBJECT_GET_CLASS(AccelClass, (obj), TYPE_ACCEL)
 
 AccelClass *accel_find(const char *opt_name);
+AccelState *current_accel(void);
+
+#ifndef CONFIG_USER_ONLY
 int accel_init_machine(AccelState *accel, MachineState *ms);
 
 /* Called just before os_setup_post (ie just before drop OS privs) */
 void accel_setup_post(MachineState *ms);
+#endif /* !CONFIG_USER_ONLY */
 
-AccelState *current_accel(void);
-
-#endif
+#endif /* QEMU_ACCEL_H */

include/sysemu/hvf.h

@@ -13,7 +13,7 @@
 #ifndef HVF_H
 #define HVF_H
 
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "qom/object.h"
 
 #ifdef CONFIG_HVF

include/sysemu/kvm.h

@@ -17,7 +17,7 @@
 #include "qemu/queue.h"
 #include "hw/core/cpu.h"
 #include "exec/memattrs.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "qom/object.h"
 
 #ifdef NEED_CPU_H

include/sysemu/kvm_int.h

@@ -10,7 +10,7 @@
 #define QEMU_KVM_INT_H
 
 #include "exec/memory.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/kvm.h"
 
 typedef struct KVMSlot

linux-user/main.c

@@ -20,6 +20,7 @@
 #include "qemu/osdep.h"
 #include "qemu-common.h"
 #include "qemu/units.h"
+#include "qemu/accel.h"
 #include "sysemu/tcg.h"
 #include "qemu-version.h"
 #include <sys/syscall.h>
@@ -701,8 +702,11 @@ int main(int argc, char **argv, char **envp)
     cpu_type = parse_cpu_option(cpu_model);
 
     /* init tcg before creating CPUs and to get qemu_host_page_size */
-    tcg_exec_init(0, false);
+    {
+        AccelClass *ac = ACCEL_GET_CLASS(current_accel());
 
+        ac->init_machine(NULL);
+    }
     cpu = cpu_create(cpu_type);
     env = cpu->env_ptr;
     cpu_reset(cpu);

softmmu/memory.c

@@ -32,7 +32,7 @@
 #include "sysemu/kvm.h"
 #include "sysemu/runstate.h"
 #include "sysemu/tcg.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "hw/boards.h"
 #include "migration/vmstate.h"
 

softmmu/qtest.c

@@ -20,7 +20,7 @@
 #include "exec/ioport.h"
 #include "exec/memory.h"
 #include "hw/irq.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/cpu-timers.h"
 #include "qemu/config-file.h"
 #include "qemu/option.h"

softmmu/vl.c

@@ -44,7 +44,7 @@
 
 #include "qemu/error-report.h"
 #include "qemu/sockets.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "hw/usb.h"
 #include "hw/isa/isa.h"
 #include "hw/scsi/scsi.h"

target/i386/hax/hax-all.c

@@ -28,7 +28,7 @@
 #include "exec/address-spaces.h"
 
 #include "qemu-common.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/reset.h"
 #include "sysemu/runstate.h"
 #include "hw/boards.h"

target/i386/hvf/hvf-i386.h

@@ -16,7 +16,7 @@
 #ifndef HVF_I386_H
 #define HVF_I386_H
 
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/hvf.h"
 #include "cpu.h"
 #include "x86.h"

target/i386/hvf/hvf.c

@@ -69,7 +69,7 @@
 #include "exec/address-spaces.h"
 #include "hw/i386/apic_internal.h"
 #include "qemu/main-loop.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "target/i386/cpu.h"
 
 #include "hvf-cpus.h"

target/i386/hvf/x86_task.c

@@ -28,7 +28,7 @@
 
 #include "hw/i386/apic_internal.h"
 #include "qemu/main-loop.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "target/i386/cpu.h"
 
 // TODO: taskswitch handling

target/i386/whpx/whpx-all.c

@@ -13,7 +13,7 @@
 #include "exec/address-spaces.h"
 #include "exec/ioport.h"
 #include "qemu-common.h"
-#include "sysemu/accel.h"
+#include "qemu/accel.h"
 #include "sysemu/whpx.h"
 #include "sysemu/cpus.h"
 #include "sysemu/runstate.h"