[Qemu-devel] [PATCH v3 1/2] Minimal RAM API support

[Alex Williamson <alex.williamson@redhat.com>]

This adds a minimum chunk of Anthony's RAM API support so that we
can identify actual VM RAM versus all the other things that make
use of qemu_ram_alloc.

Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
---

 Makefile.objs |    1 +
 cpu-common.h  |    2 +
 memory.c      |   97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 memory.h      |   44 ++++++++++++++++++++++++++
 4 files changed, 144 insertions(+), 0 deletions(-)
 create mode 100644 memory.c
 create mode 100644 memory.h

diff --git a/Makefile.objs b/Makefile.objs
index f07fb01..33fae0b 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -154,6 +154,7 @@ hw-obj-y += vl.o loader.o
 hw-obj-y += virtio.o virtio-console.o
 hw-obj-y += fw_cfg.o pci.o pci_host.o pcie_host.o
 hw-obj-y += watchdog.o
+hw-obj-y += memory.o
 hw-obj-$(CONFIG_ISA_MMIO) += isa_mmio.o
 hw-obj-$(CONFIG_ECC) += ecc.o
 hw-obj-$(CONFIG_NAND) += nand.o
diff --git a/cpu-common.h b/cpu-common.h
index a543b5d..6aa2738 100644
--- a/cpu-common.h
+++ b/cpu-common.h
@@ -23,6 +23,8 @@
 /* address in the RAM (different from a physical address) */
 typedef unsigned long ram_addr_t;
 
+#include "memory.h"
+
 /* memory API */
 
 typedef void CPUWriteMemoryFunc(void *opaque, target_phys_addr_t addr, uint32_t value);
diff --git a/memory.c b/memory.c
new file mode 100644
index 0000000..742776f
--- /dev/null
+++ b/memory.c
@@ -0,0 +1,97 @@
+/*
+ * RAM API
+ *
+ *  Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+#include "memory.h"
+#include "range.h"
+
+typedef struct ram_slot {
+    target_phys_addr_t start_addr;
+    ram_addr_t size;
+    ram_addr_t offset;
+    QLIST_ENTRY(ram_slot) next;
+} ram_slot;
+
+static QLIST_HEAD(ram_slots, ram_slot) ram_slots =
+    QLIST_HEAD_INITIALIZER(ram_slots);
+
+static ram_slot *qemu_ram_find_slot(target_phys_addr_t start_addr,
+                                   ram_addr_t size)
+{
+    ram_slot *slot;
+
+    QLIST_FOREACH(slot, &ram_slots, next) {
+        if (slot->start_addr == start_addr && slot->size == size) {
+            return slot;
+        }
+
+        if (ranges_overlap(start_addr, size, slot->start_addr, slot->size)) {
+            hw_error("Ram range overlaps existing slot\n");
+        }
+    }
+
+    return NULL;
+}
+
+int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                      ram_addr_t phys_offset)
+{
+    ram_slot *slot;
+
+    if (!size) {
+        return -EINVAL;
+    }
+
+    assert(!qemu_ram_find_slot(start_addr, size));
+
+    slot = qemu_mallocz(sizeof(ram_slot));
+
+    slot->start_addr = start_addr;
+    slot->size = size;
+    slot->offset = phys_offset;
+
+    QLIST_INSERT_HEAD(&ram_slots, slot, next);
+
+    cpu_register_physical_memory(slot->start_addr, slot->size, slot->offset);
+
+    return 0;
+}
+
+void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size)
+{
+    ram_slot *slot;
+
+    if (!size) {
+        return;
+    }
+
+    slot = qemu_ram_find_slot(start_addr, size);
+    assert(slot != NULL);
+
+    QLIST_REMOVE(slot, next);
+    qemu_free(slot);
+    cpu_register_physical_memory(start_addr, size, IO_MEM_UNASSIGNED);
+
+    return;
+}
+
+int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn)
+{
+    ram_slot *slot;
+
+    QLIST_FOREACH(slot, &ram_slots, next) {
+        int ret = fn(opaque, slot->start_addr, slot->size, slot->offset);
+        if (ret) {
+            return ret;
+        }
+    }
+    return 0;
+}
diff --git a/memory.h b/memory.h
new file mode 100644
index 0000000..e7aa5cb
--- /dev/null
+++ b/memory.h
@@ -0,0 +1,44 @@
+#ifndef QEMU_MEMORY_H
+#define QEMU_MEMORY_H
+/*
+ * RAM API
+ *
+ *  Copyright Red Hat, Inc. 2010
+ *
+ * Authors:
+ *  Alex Williamson <alex.williamson@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.  See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu-common.h"
+#include "cpu-common.h"
+
+typedef int (*qemu_ram_for_each_slot_fn)(void *opaque,
+                                         target_phys_addr_t start_addr,
+                                         ram_addr_t size,
+                                         ram_addr_t phys_offset);
+
+/**
+ * qemu_ram_register() : Register a region of guest physical memory
+ *
+ * The new region must not overlap an existing region.
+ */
+int qemu_ram_register(target_phys_addr_t start_addr, ram_addr_t size,
+                      ram_addr_t phys_offset);
+
+/**
+ * qemu_ram_unregister() : Unregister a region of guest physical memory
+ */
+void qemu_ram_unregister(target_phys_addr_t start_addr, ram_addr_t size);
+
+/**
+ * qemu_ram_for_each_slot() : Call fn() on each registered region
+ *
+ * Stop on non-zero return from fn().
+ */
+int qemu_ram_for_each_slot(void *opaque, qemu_ram_for_each_slot_fn fn);
+
+#endif /* QEMU_MEMORY_H */