Revert "xen: start PCI hole at 0xe0000000 (same as pc_init1 and qemu-xen-traditional)"

This reverts commit 9f24a803.

The start of the PCI hole is actually set to 0xf0000000 by hvmloader.
In order to retain ABI compatibility with Xen we leave the start of the
PCI hole at 0xf0000000 in QEMU (for Xen) too.
Signed-off-by: NStefano Stabellini <stefano.stabellini@eu.citrix.com>

hw/i386/pc_piix.c

@@ -102,9 +102,9 @@ static void pc_init1(MemoryRegion *system_memory,
         kvmclock_create();
     }
 
-    if (ram_size >= QEMU_BELOW_4G_RAM_END ) {
-        above_4g_mem_size = ram_size - QEMU_BELOW_4G_RAM_END;
-        below_4g_mem_size = QEMU_BELOW_4G_RAM_END;
+    if (ram_size >= 0xe0000000 ) {
+        above_4g_mem_size = ram_size - 0xe0000000;
+        below_4g_mem_size = 0xe0000000;
     } else {
         above_4g_mem_size = 0;
         below_4g_mem_size = ram_size;

include/hw/i386/pc.h

@@ -79,9 +79,6 @@ extern int fd_bootchk;
 void pc_register_ferr_irq(qemu_irq irq);
 void pc_acpi_smi_interrupt(void *opaque, int irq, int level);
 
-#define QEMU_BELOW_4G_RAM_END       0xe0000000
-#define QEMU_BELOW_4G_MMIO_LENGTH   ((1ULL << 32) - QEMU_BELOW_4G_RAM_END)
-
 void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge);
 void pc_hot_add_cpu(const int64_t id, Error **errp);
 void pc_acpi_init(const char *default_dsdt);

xen-all.c

@@ -161,18 +161,18 @@ static void xen_ram_init(ram_addr_t ram_size)
     ram_addr_t block_len;
 
     block_len = ram_size;
-    if (ram_size >= QEMU_BELOW_4G_RAM_END) {
+    if (ram_size >= HVM_BELOW_4G_RAM_END) {
         /* Xen does not allocate the memory continuously, and keep a hole at
-         * QEMU_BELOW_4G_RAM_END of QEMU_BELOW_4G_MMIO_LENGTH
+         * HVM_BELOW_4G_MMIO_START of HVM_BELOW_4G_MMIO_LENGTH
          */
-        block_len += QEMU_BELOW_4G_MMIO_LENGTH;
+        block_len += HVM_BELOW_4G_MMIO_LENGTH;
     }
     memory_region_init_ram(&ram_memory, "xen.ram", block_len);
     vmstate_register_ram_global(&ram_memory);
 
-    if (ram_size >= QEMU_BELOW_4G_RAM_END) {
-        above_4g_mem_size = ram_size - QEMU_BELOW_4G_RAM_END;
-        below_4g_mem_size = QEMU_BELOW_4G_RAM_END;
+    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 {
         below_4g_mem_size = ram_size;
     }