Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 84 insertions, 0 deletions

diff --git a/include/exec/log.h b/include/exec/log.h
new file mode 100644
index 000000000..3c7fa65ea
--- /dev/null
+++ b/include/exec/log.h
@@ -0,0 +1,84 @@
+#ifndef QEMU_EXEC_LOG_H
+#define QEMU_EXEC_LOG_H
+
+#include "qemu/log.h"
+#include "hw/core/cpu.h"
+#include "disas/disas.h"
+
+/* cpu_dump_state() logging functions: */
+/**
+ * log_cpu_state:
+ * @cpu: The CPU whose state is to be logged.
+ * @flags: Flags what to log.
+ *
+ * Logs the output of cpu_dump_state().
+ */
+static inline void log_cpu_state(CPUState *cpu, int flags)
+{
+    QemuLogFile *logfile;
+
+    if (qemu_log_enabled()) {
+        rcu_read_lock();
+        logfile = qatomic_rcu_read(&qemu_logfile);
+        if (logfile) {
+            cpu_dump_state(cpu, logfile->fd, flags);
+        }
+        rcu_read_unlock();
+    }
+}
+
+/**
+ * log_cpu_state_mask:
+ * @mask: Mask when to log.
+ * @cpu: The CPU whose state is to be logged.
+ * @flags: Flags what to log.
+ *
+ * Logs the output of cpu_dump_state() if loglevel includes @mask.
+ */
+static inline void log_cpu_state_mask(int mask, CPUState *cpu, int flags)
+{
+    if (qemu_loglevel & mask) {
+        log_cpu_state(cpu, flags);
+    }
+}
+
+#ifdef NEED_CPU_H
+/* disas() and target_disas() to qemu_logfile: */
+static inline void log_target_disas(CPUState *cpu, target_ulong start,
+                                    target_ulong len)
+{
+    QemuLogFile *logfile;
+    rcu_read_lock();
+    logfile = qatomic_rcu_read(&qemu_logfile);
+    if (logfile) {
+        target_disas(logfile->fd, cpu, start, len);
+    }
+    rcu_read_unlock();
+}
+
+static inline void log_disas(const void *code, unsigned long size)
+{
+    QemuLogFile *logfile;
+    rcu_read_lock();
+    logfile = qatomic_rcu_read(&qemu_logfile);
+    if (logfile) {
+        disas(logfile->fd, code, size);
+    }
+    rcu_read_unlock();
+}
+
+#if defined(CONFIG_USER_ONLY)
+/* page_dump() output to the log file: */
+static inline void log_page_dump(const char *operation)
+{
+    FILE *logfile = qemu_log_lock();
+    if (logfile) {
+        qemu_log("page layout changed following %s\n", operation);
+        page_dump(logfile);
+    }
+    qemu_log_unlock(logfile);
+}
+#endif
+#endif
+
+#endif