cpus: extract out kvm-specific code to accel/kvm

register a "CpusAccel" interface for KVM as well.

Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com>
[added const]
Signed-off-by: Claudio Fontana <cfontana@suse.de>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

5 files changed, 123 insertions, 4 deletions

diff --git a/accel/kvm/kvm-all.c b/accel/kvm/kvm-all.c
index e4bbf78366..784e9dad55 100644
--- a/accel/kvm/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -44,6 +44,9 @@
 #include "qapi/qapi-types-common.h"
 #include "qapi/qapi-visit-common.h"
 #include "sysemu/reset.h"
+#include "qemu/guest-random.h"
+#include "sysemu/hw_accel.h"
+#include "kvm-cpus.h"
 
 #include "hw/boards.h"
 
@@ -378,7 +381,7 @@ err:
     return ret;
 }
 
-int kvm_destroy_vcpu(CPUState *cpu)
+static int do_kvm_destroy_vcpu(CPUState *cpu)
 {
     KVMState *s = kvm_state;
     long mmap_size;
@@ -412,6 +415,14 @@ err:
     return ret;
 }
 
+void kvm_destroy_vcpu(CPUState *cpu)
+{
+    if (do_kvm_destroy_vcpu(cpu) < 0) {
+        error_report("kvm_destroy_vcpu failed");
+        exit(EXIT_FAILURE);
+    }
+}
+
 static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
 {
     struct KVMParkedVcpu *cpu;
@@ -2232,6 +2243,7 @@ static int kvm_init(MachineState *ms)
         assert(!ret);
     }
 
+    cpus_register_accel(&kvm_cpus);
     return 0;
 
 err:
diff --git a/accel/kvm/kvm-cpus.c b/accel/kvm/kvm-cpus.c
new file mode 100644
index 0000000000..a120601564
--- /dev/null
+++ b/accel/kvm/kvm-cpus.c
@@ -0,0 +1,88 @@
+/*
+ * QEMU KVM support
+ *
+ * Copyright IBM, Corp. 2008
+ *           Red Hat, Inc. 2008
+ *
+ * Authors:
+ *  Anthony Liguori   <aliguori@us.ibm.com>
+ *  Glauber Costa     <gcosta@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.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/error-report.h"
+#include "qemu/main-loop.h"
+#include "sysemu/kvm_int.h"
+#include "sysemu/runstate.h"
+#include "sysemu/cpus.h"
+#include "qemu/guest-random.h"
+
+#include "kvm-cpus.h"
+
+static void *kvm_vcpu_thread_fn(void *arg)
+{
+    CPUState *cpu = arg;
+    int r;
+
+    rcu_register_thread();
+
+    qemu_mutex_lock_iothread();
+    qemu_thread_get_self(cpu->thread);
+    cpu->thread_id = qemu_get_thread_id();
+    cpu->can_do_io = 1;
+    current_cpu = cpu;
+
+    r = kvm_init_vcpu(cpu);
+    if (r < 0) {
+        error_report("kvm_init_vcpu failed: %s", strerror(-r));
+        exit(1);
+    }
+
+    kvm_init_cpu_signals(cpu);
+
+    /* signal CPU creation */
+    cpu_thread_signal_created(cpu);
+    qemu_guest_random_seed_thread_part2(cpu->random_seed);
+
+    do {
+        if (cpu_can_run(cpu)) {
+            r = kvm_cpu_exec(cpu);
+            if (r == EXCP_DEBUG) {
+                cpu_handle_guest_debug(cpu);
+            }
+        }
+        qemu_wait_io_event(cpu);
+    } while (!cpu->unplug || cpu_can_run(cpu));
+
+    kvm_destroy_vcpu(cpu);
+    cpu_thread_signal_destroyed(cpu);
+    qemu_mutex_unlock_iothread();
+    rcu_unregister_thread();
+    return NULL;
+}
+
+static void kvm_start_vcpu_thread(CPUState *cpu)
+{
+    char thread_name[VCPU_THREAD_NAME_SIZE];
+
+    cpu->thread = g_malloc0(sizeof(QemuThread));
+    cpu->halt_cond = g_malloc0(sizeof(QemuCond));
+    qemu_cond_init(cpu->halt_cond);
+    snprintf(thread_name, VCPU_THREAD_NAME_SIZE, "CPU %d/KVM",
+             cpu->cpu_index);
+    qemu_thread_create(cpu->thread, thread_name, kvm_vcpu_thread_fn,
+                       cpu, QEMU_THREAD_JOINABLE);
+}
+
+const CpusAccel kvm_cpus = {
+    .create_vcpu_thread = kvm_start_vcpu_thread,
+
+    .synchronize_post_reset = kvm_cpu_synchronize_post_reset,
+    .synchronize_post_init = kvm_cpu_synchronize_post_init,
+    .synchronize_state = kvm_cpu_synchronize_state,
+    .synchronize_pre_loadvm = kvm_cpu_synchronize_pre_loadvm,
+};
diff --git a/accel/kvm/kvm-cpus.h b/accel/kvm/kvm-cpus.h
new file mode 100644
index 0000000000..547fbee111
--- /dev/null
+++ b/accel/kvm/kvm-cpus.h
@@ -0,0 +1,17 @@
+/*
+ * Accelerator CPUS Interface
+ *
+ * Copyright 2020 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.
+ */
+
+#ifndef KVM_CPUS_H
+#define KVM_CPUS_H
+
+#include "sysemu/cpus.h"
+
+extern const CpusAccel kvm_cpus;
+
+#endif /* KVM_CPUS_H */
diff --git a/accel/kvm/meson.build b/accel/kvm/meson.build
index 4db2388e2f..7e9dafe24c 100644
--- a/accel/kvm/meson.build
+++ b/accel/kvm/meson.build
@@ -1,5 +1,8 @@
 kvm_ss = ss.source_set()
-kvm_ss.add(files('kvm-all.c'))
+kvm_ss.add(files(
+  'kvm-all.c',
+  'kvm-cpus.c',
+))
 kvm_ss.add(when: 'CONFIG_SEV', if_false: files('sev-stub.c'))
 
 specific_ss.add_all(when: 'CONFIG_KVM', if_true: kvm_ss)
diff --git a/accel/stubs/kvm-stub.c b/accel/stubs/kvm-stub.c
index 82f118d2df..69f8a842da 100644
--- a/accel/stubs/kvm-stub.c
+++ b/accel/stubs/kvm-stub.c
@@ -32,9 +32,8 @@ bool kvm_readonly_mem_allowed;
 bool kvm_ioeventfd_any_length_allowed;
 bool kvm_msi_use_devid;
 
-int kvm_destroy_vcpu(CPUState *cpu)
+void kvm_destroy_vcpu(CPUState *cpu)
 {
-    return -ENOSYS;
 }
 
 int kvm_init_vcpu(CPUState *cpu)