[PATCH v3 3/6] i386/pc: pass pci_hole64_size to pc_memory_init()

[Joao Martins <joao.m.martins@oracle.com>]

Use the pre-initialized pci-host qdev and fetch the
pci-hole64-size into pc_memory_init() newly added argument.
piix needs a bit of care given all the !pci_enabled()
and that the pci_hole64_size is private to i440fx.

This is in preparation to determine that host-phys-bits are
enough and for pci-hole64-size to be considered to relocate
ram-above-4g to be at 1T (on AMD platforms).

Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
---
 hw/i386/pc.c                 | 3 ++-
 hw/i386/pc_piix.c            | 5 ++++-
 hw/i386/pc_q35.c             | 8 +++++++-
 hw/pci-host/i440fx.c         | 7 +++++++
 include/hw/i386/pc.h         | 3 ++-
 include/hw/pci-host/i440fx.h | 1 +
 6 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 7de0e87f4a3f..360f4e10001b 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -805,7 +805,8 @@ void xen_load_linux(PCMachineState *pcms)
 void pc_memory_init(PCMachineState *pcms,
                     MemoryRegion *system_memory,
                     MemoryRegion *rom_memory,
-                    MemoryRegion **ram_memory)
+                    MemoryRegion **ram_memory,
+                    uint64_t pci_hole64_size)
 {
     int linux_boot, i;
     MemoryRegion *option_rom_mr;
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 9ff49e672628..5a608e30e28f 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -91,6 +91,7 @@ static void pc_init1(MachineState *machine,
     MemoryRegion *pci_memory;
     MemoryRegion *rom_memory;
     ram_addr_t lowmem;
+    uint64_t hole64_size;
     DeviceState *i440fx_dev;
 
     /*
@@ -166,10 +167,12 @@ static void pc_init1(MachineState *machine,
         memory_region_init(pci_memory, NULL, "pci", UINT64_MAX);
         rom_memory = pci_memory;
         i440fx_dev = qdev_new(host_type);
+        hole64_size = i440fx_pci_hole64_size(i440fx_dev);
     } else {
         pci_memory = NULL;
         rom_memory = system_memory;
         i440fx_dev = NULL;
+        hole64_size = 0;
     }
 
     pc_guest_info_init(pcms);
@@ -186,7 +189,7 @@ static void pc_init1(MachineState *machine,
     /* allocate ram and load rom/bios */
     if (!xen_enabled()) {
         pc_memory_init(pcms, system_memory,
-                       rom_memory, &ram_memory);
+                       rom_memory, &ram_memory, hole64_size);
     } else {
         pc_system_flash_cleanup_unused(pcms);
         if (machine->kernel_filename != NULL) {
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 2881afd75a82..c81d21d1ebb4 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -138,6 +138,7 @@ static void pc_q35_init(MachineState *machine)
     MachineClass *mc = MACHINE_GET_CLASS(machine);
     bool acpi_pcihp;
     bool keep_pci_slot_hpc;
+    uint64_t pci_hole64_size = 0;
 
     /* Check whether RAM fits below 4G (leaving 1/2 GByte for IO memory
      * and 256 Mbytes for PCI Express Enhanced Configuration Access Mapping
@@ -206,8 +207,13 @@ static void pc_q35_init(MachineState *machine)
     /* create pci host bus */
     q35_host = Q35_HOST_DEVICE(qdev_new(TYPE_Q35_HOST_DEVICE));
 
+    if (pcmc->pci_enabled) {
+        pci_hole64_size = q35_host->mch.pci_hole64_size;
+    }
+
     /* allocate ram and load rom/bios */
-    pc_memory_init(pcms, get_system_memory(), rom_memory, &ram_memory);
+    pc_memory_init(pcms, get_system_memory(), rom_memory, &ram_memory,
+                   pci_hole64_size);
 
     object_property_add_child(qdev_get_machine(), "q35", OBJECT(q35_host));
     object_property_set_link(OBJECT(q35_host), MCH_HOST_PROP_RAM_MEM,
diff --git a/hw/pci-host/i440fx.c b/hw/pci-host/i440fx.c
index 5c1bab5c58ed..c5cc28250d5c 100644
--- a/hw/pci-host/i440fx.c
+++ b/hw/pci-host/i440fx.c
@@ -237,6 +237,13 @@ static void i440fx_realize(PCIDevice *dev, Error **errp)
     }
 }
 
+uint64_t i440fx_pci_hole64_size(DeviceState *i440fx_dev)
+{
+        I440FXState *i440fx = I440FX_PCI_HOST_BRIDGE(i440fx_dev);
+
+        return i440fx->pci_hole64_size;
+}
+
 PCIBus *i440fx_init(const char *host_type, const char *pci_type,
                     DeviceState *dev,
                     PCII440FXState **pi440fx_state,
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 9c9f4ac74810..d8b9c4ebd748 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -158,7 +158,8 @@ void xen_load_linux(PCMachineState *pcms);
 void pc_memory_init(PCMachineState *pcms,
                     MemoryRegion *system_memory,
                     MemoryRegion *rom_memory,
-                    MemoryRegion **ram_memory);
+                    MemoryRegion **ram_memory,
+                    uint64_t pci_hole64_size);
 uint64_t pc_pci_hole64_start(void);
 DeviceState *pc_vga_init(ISABus *isa_bus, PCIBus *pci_bus);
 void pc_basic_device_init(struct PCMachineState *pcms,
diff --git a/include/hw/pci-host/i440fx.h b/include/hw/pci-host/i440fx.h
index c4710445e30a..1299d6a2b0e4 100644
--- a/include/hw/pci-host/i440fx.h
+++ b/include/hw/pci-host/i440fx.h
@@ -45,5 +45,6 @@ PCIBus *i440fx_init(const char *host_type, const char *pci_type,
                     MemoryRegion *pci_memory,
                     MemoryRegion *ram_memory);
 
+uint64_t i440fx_pci_hole64_size(DeviceState *i440fx_dev);
 
 #endif
-- 
2.17.2