1 files changed, 110 insertions, 0 deletions
diff --git a/target-ppc/kvm_ppc.c b/target-ppc/kvm_ppc.c
new file mode 100644
index 0000000000..0caa5b98c7
--- /dev/null
+++ b/target-ppc/kvm_ppc.c
@@ -0,0 +1,110 @@
+/*
+ * PowerPC KVM support
+ *
+ * Copyright IBM Corp. 2008
+ *
+ * Authors:
+ *  Hollis Blanchard <hollisb@us.ibm.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-common.h"
+#include "qemu-timer.h"
+#include "kvm_ppc.h"
+#include "device_tree.h"
+
+#define PROC_DEVTREE_PATH "/proc/device-tree"
+
+static QEMUTimer *kvmppc_timer;
+static unsigned int kvmppc_timer_rate;
+
+#ifdef HAVE_FDT
+static int kvmppc_read_host_property(const char *node_path, const char *prop,
+                                     void *val, size_t len)
+{
+    char *path;
+    FILE *f;
+    int ret;
+    int pathlen;
+
+    pathlen = snprintf(NULL, 0, "%s/%s/%s", PROC_DEVTREE_PATH, node_path, prop)
+              + 1;
+    path = qemu_malloc(pathlen);
+    if (path == NULL) {
+        ret = -ENOMEM;
+        goto out;
+    }
+
+    snprintf(path, pathlen, "%s/%s/%s", PROC_DEVTREE_PATH, node_path, prop);
+
+    f = fopen(path, "rb");
+    if (f == NULL) {
+        ret = errno;
+        goto free;
+    }
+
+    len = fread(val, len, 1, f);
+    if (len != 1) {
+        ret = ferror(f);
+        goto close;
+    }
+
+close:
+    fclose(f);
+free:
+    free(path);
+out:
+    return ret;
+}
+
+static int kvmppc_copy_host_cell(void *fdt, const char *node, const char *prop)
+{
+    uint32_t cell;
+    int ret;
+
+    ret = kvmppc_read_host_property(node, prop, &cell, sizeof(cell));
+    if (ret < 0) {
+        fprintf(stderr, "couldn't read host %s/%s\n", node, prop);
+        goto out;
+    }
+
+    ret = qemu_devtree_setprop_cell(fdt, node, prop, cell);
+    if (ret < 0) {
+        fprintf(stderr, "couldn't set guest %s/%s\n", node, prop);
+        goto out;
+    }
+
+out:
+    return ret;
+}
+
+void kvmppc_fdt_update(void *fdt)
+{
+    /* Copy data from the host device tree into the guest. Since the guest can
+     * directly access the timebase without host involvement, we must expose
+     * the correct frequencies. */
+    kvmppc_copy_host_cell(fdt, "/cpus/cpu@0", "clock-frequency");
+    kvmppc_copy_host_cell(fdt, "/cpus/cpu@0", "timebase-frequency");
+}
+#endif
+
+static void kvmppc_timer_hack(void *opaque)
+{
+    qemu_service_io();
+    qemu_mod_timer(kvmppc_timer, qemu_get_clock(vm_clock) + kvmppc_timer_rate);
+}
+
+void kvmppc_init(void)
+{
+    /* XXX The only reason KVM yields control back to qemu is device IO. Since
+     * an idle guest does no IO, qemu's device model will never get a chance to
+     * run. So, until Qemu gains IO threads, we create this timer to ensure
+     * that the device model gets a chance to run. */
+    kvmppc_timer_rate = ticks_per_sec / 10;
+    kvmppc_timer = qemu_new_timer(vm_clock, &kvmppc_timer_hack, NULL);
+    qemu_mod_timer(kvmppc_timer, qemu_get_clock(vm_clock) + kvmppc_timer_rate);
+}
+