Merge tag 'patchew/20200219160953.13771-1-imammedo@redhat.com' of https://github.com/patchew-project/qemu into HEAD

This series removes ad hoc RAM allocation API (memory_region_allocate_system_memory)
and consolidates it around hostmem backend. It allows to

* resolve conflicts between global -mem-prealloc and hostmem's "policy" option,
  fixing premature allocation before binding policy is applied

* simplify complicated memory allocation routines which had to deal with 2 ways
  to allocate RAM.

* reuse hostmem backends of a choice for main RAM without adding extra CLI
  options to duplicate hostmem features.  A recent case was -mem-shared, to
  enable vhost-user on targets that don't support hostmem backends [1] (ex: s390)

* move RAM allocation from individual boards into generic machine code and
  provide them with prepared MemoryRegion.

* clean up deprecated NUMA features which were tied to the old API (see patches)
  - "numa: remove deprecated -mem-path fallback to anonymous RAM"
  - (POSTPONED, waiting on libvirt side) "forbid '-numa node,mem' for 5.0 and newer machine types"
  - (POSTPONED) "numa: remove deprecated implicit RAM distribution between nodes"

Introduce a new machine.memory-backend property and wrapper code that aliases
global -mem-path and -mem-alloc into automatically created hostmem backend
properties (provided memory-backend was not set explicitly given by user).
A bulk of trivial patches then follow to incrementally convert individual
boards to using machine.memory-backend provided MemoryRegion.

Board conversion typically involves:

* providing MachineClass::default_ram_size and MachineClass::default_ram_id
  so generic code could create default backend if user didn't explicitly provide
  memory-backend or -m options

* dropping memory_region_allocate_system_memory() call

* using convenience MachineState::ram MemoryRegion, which points to MemoryRegion
   allocated by ram-memdev

On top of that for some boards:

* missing ram_size checks are added (typically it were boards with fixed ram size)

* ram_size fixups are replaced by checks and hard errors, forcing user to
  provide correct "-m" values instead of ignoring it and continuing running.

After all boards are converted, the old API is removed and memory allocation
routines are cleaned up.

1 files changed, 8 insertions, 9 deletions

diff --git a/hw/ppc/e500.c b/hw/ppc/e500.c
index af537bba2b..854cd3ac46 100644
--- a/hw/ppc/e500.c
+++ b/hw/ppc/e500.c
@@ -832,7 +832,6 @@ static void ppce500_power_off(void *opaque, int line, int on)
 void ppce500_init(MachineState *machine)
 {
     MemoryRegion *address_space_mem = get_system_memory();
-    MemoryRegion *ram = g_new(MemoryRegion, 1);
     PPCE500MachineState *pms = PPCE500_MACHINE(machine);
     const PPCE500MachineClass *pmc = PPCE500_MACHINE_GET_CLASS(machine);
     PCIBus *pci_bus;
@@ -907,13 +906,13 @@ void ppce500_init(MachineState *machine)
 
     env = firstenv;
 
-    /* Fixup Memory size on a alignment boundary */
-    ram_size &= ~(RAM_SIZES_ALIGN - 1);
-    machine->ram_size = ram_size;
+    if (!QEMU_IS_ALIGNED(machine->ram_size, RAM_SIZES_ALIGN)) {
+        error_report("RAM size must be multiple of %" PRIu64, RAM_SIZES_ALIGN);
+        exit(EXIT_FAILURE);
+    }
 
     /* Register Memory */
-    memory_region_allocate_system_memory(ram, NULL, "mpc8544ds.ram", ram_size);
-    memory_region_add_subregion(address_space_mem, 0, ram);
+    memory_region_add_subregion(address_space_mem, 0, machine->ram);
 
     dev = qdev_create(NULL, "e500-ccsr");
     object_property_add_child(qdev_get_machine(), "e500-ccsr",
@@ -1084,7 +1083,7 @@ void ppce500_init(MachineState *machine)
         kernel_base = cur_base;
         kernel_size = load_image_targphys(machine->kernel_filename,
                                           cur_base,
-                                          ram_size - cur_base);
+                                          machine->ram_size - cur_base);
         if (kernel_size < 0) {
             error_report("could not load kernel '%s'",
                          machine->kernel_filename);
@@ -1098,7 +1097,7 @@ void ppce500_init(MachineState *machine)
     if (machine->initrd_filename) {
         initrd_base = (cur_base + INITRD_LOAD_PAD) & ~INITRD_PAD_MASK;
         initrd_size = load_image_targphys(machine->initrd_filename, initrd_base,
-                                          ram_size - initrd_base);
+                                          machine->ram_size - initrd_base);
 
         if (initrd_size < 0) {
             error_report("could not load initial ram disk '%s'",
@@ -1116,7 +1115,7 @@ void ppce500_init(MachineState *machine)
      * ensures enough space between kernel and initrd.
      */
     dt_base = (loadaddr + payload_size + DTC_LOAD_PAD) & ~DTC_PAD_MASK;
-    if (dt_base + DTB_MAX_SIZE > ram_size) {
+    if (dt_base + DTB_MAX_SIZE > machine->ram_size) {
             error_report("not enough memory for device tree");
             exit(1);
     }