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Re: [Xen-devel] [PATCH v5 3/3] xen-hvm: Pass is_default to xen_hvm_init



On 06/08/14 11:24, Michael S. Tsirkin wrote:
On Fri, Jun 06, 2014 at 01:52:06PM -0400, Don Slutz wrote:
This is the xen part of "pc & q35: Add new machine opt max-ram-below-4g"

Acked-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Signed-off-by: Don Slutz <dslutz@xxxxxxxxxxx>
---
v5:
   Added Acked-by: Stefano Stabellini
   Minor change of pmc to pcms.


  hw/i386/pc_piix.c    |  1 +
  hw/i386/pc_q35.c     |  1 +
  include/hw/xen/xen.h |  2 +-
  xen-hvm-stub.c       |  2 +-
  xen-hvm.c            | 36 ++++++++++++++++++++----------------
  5 files changed, 24 insertions(+), 18 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 25f4727..27851c6 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -125,6 +125,7 @@ static void pc_init1(MachineState *machine,
      }
if (xen_enabled() && xen_hvm_init(&below_4g_mem_size, &above_4g_mem_size,
+                                      !(pcms && pcms->max_ram_below_4g),
                                        &ram_memory) != 0) {
          fprintf(stderr, "xen hardware virtual machine initialisation 
failed\n");
          exit(1);
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 155cdf1..6436fce 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -114,6 +114,7 @@ static void pc_q35_init(MachineState *machine)
      }
if (xen_enabled() && xen_hvm_init(&below_4g_mem_size, &above_4g_mem_size,
+                                      !(pcms && pcms->max_ram_below_4g),
                                        &ram_memory) != 0) {
          fprintf(stderr, "xen hardware virtual machine initialisation 
failed\n");
          exit(1);
diff --git a/include/hw/xen/xen.h b/include/hw/xen/xen.h
index f71f2d8..6b94c14 100644
--- a/include/hw/xen/xen.h
+++ b/include/hw/xen/xen.h
@@ -41,7 +41,7 @@ void xenstore_store_pv_console_info(int i, struct 
CharDriverState *chr);
#if defined(NEED_CPU_H) && !defined(CONFIG_USER_ONLY)
  int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
-                 MemoryRegion **ram_memory);
+                 bool is_default, MemoryRegion **ram_memory);
  void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size,
                     struct MemoryRegion *mr);
  void xen_modified_memory(ram_addr_t start, ram_addr_t length);
diff --git a/xen-hvm-stub.c b/xen-hvm-stub.c
index 2d98696..d1bdb76 100644
--- a/xen-hvm-stub.c
+++ b/xen-hvm-stub.c
@@ -52,7 +52,7 @@ void xen_modified_memory(ram_addr_t start, ram_addr_t length)
  }
int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
-                 MemoryRegion **ram_memory)
+                 bool is_default, MemoryRegion **ram_memory)
  {
      return 0;
  }
diff --git a/xen-hvm.c b/xen-hvm.c
index a0b6b5d..8d27ee6 100644
--- a/xen-hvm.c
+++ b/xen-hvm.c
@@ -156,31 +156,34 @@ qemu_irq *xen_interrupt_controller_init(void)
  /* Memory Ops */
static void xen_ram_init(ram_addr_t *below_4g_mem_size,
-                         ram_addr_t *above_4g_mem_size,
+                         ram_addr_t *above_4g_mem_size, bool is_default,
                           ram_addr_t ram_size, MemoryRegion **ram_memory_p)
  {
      MemoryRegion *sysmem = get_system_memory();
      ram_addr_t block_len;
- block_len = ram_size;
-    if (ram_size >= HVM_BELOW_4G_RAM_END) {
-        /* Xen does not allocate the memory continuously, and keep a hole at
-         * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
+    if (is_default) {
+        if (ram_size >= HVM_BELOW_4G_RAM_END) {
+            *above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
+            *below_4g_mem_size = HVM_BELOW_4G_RAM_END;
+        } else {
+            *above_4g_mem_size = 0;
+            *below_4g_mem_size = ram_size;
+        }
+    }
+    if (!*above_4g_mem_size) {
+        block_len = ram_size;
+    } else {
+        /*
+         * Xen does not allocate the memory continuously, and keep a hole of
+         * of the size computed above or passed in.
           */
Not your fault but this is ambigious.
I guess this means "does not allocate the memory continuously, it keeps a
hole ..."?


How does (dropping the double of also):

Xen does not allocate the memory continuously, it keeps a hole of the size 
computed above or passed in.


   -Don Slutz



-        block_len += HVM_BELOW_4G_MMIO_LENGTH;
+        block_len = (1ULL << 32) + *above_4g_mem_size;
      }
      memory_region_init_ram(&ram_memory, NULL, "xen.ram", block_len);
      *ram_memory_p = &ram_memory;
      vmstate_register_ram_global(&ram_memory);
- if (ram_size >= HVM_BELOW_4G_RAM_END) {
-        *above_4g_mem_size = ram_size - HVM_BELOW_4G_RAM_END;
-        *below_4g_mem_size = HVM_BELOW_4G_RAM_END;
-    } else {
-        *above_4g_mem_size = 0;
-        *below_4g_mem_size = ram_size;
-    }
-
      memory_region_init_alias(&ram_640k, NULL, "xen.ram.640k",
                               &ram_memory, 0, 0xa0000);
      memory_region_add_subregion(sysmem, 0, &ram_640k);
@@ -962,7 +965,7 @@ static void xen_wakeup_notifier(Notifier *notifier, void 
*data)
  }
int xen_hvm_init(ram_addr_t *below_4g_mem_size, ram_addr_t *above_4g_mem_size,
-                 MemoryRegion **ram_memory)
+                 bool is_default, MemoryRegion **ram_memory)
  {
      int i, rc;
      unsigned long ioreq_pfn;
@@ -1040,7 +1043,8 @@ int xen_hvm_init(ram_addr_t *below_4g_mem_size, 
ram_addr_t *above_4g_mem_size,
/* Init RAM management */
      xen_map_cache_init(xen_phys_offset_to_gaddr, state);
-    xen_ram_init(below_4g_mem_size, above_4g_mem_size, ram_size, ram_memory);
+    xen_ram_init(below_4g_mem_size, above_4g_mem_size, is_default, ram_size,
+                 ram_memory);
qemu_add_vm_change_state_handler(xen_hvm_change_state_handler, state); --
1.8.4


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