[Qemu-devel] [PATCH 3/4] xen:hw:pci-host:piix: introduce xen_igd_i440fx_init

[Tiejun Chen <tiejun.chen@intel.com>]

This is almost same as an original i440fx_init but just
work with that xen igd host bridge to passthrough.

Signed-off-by: Tiejun Chen <tiejun.chen@intel.com>
---
 hw/pci-host/piix.c   | 79 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 include/hw/i386/pc.h | 10 +++++++
 2 files changed, 89 insertions(+)

diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 9feddf5..7ef08d7 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -407,6 +407,85 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
     return b;
 }
 
+PCIBus *xen_igd_i440fx_init(PCII440FXState **pi440fx_state,
+                    int *piix3_devfn,
+                    ISABus **isa_bus, qemu_irq *pic,
+                    MemoryRegion *address_space_mem,
+                    MemoryRegion *address_space_io,
+                    ram_addr_t ram_size,
+                    ram_addr_t below_4g_mem_size,
+                    ram_addr_t above_4g_mem_size,
+                    MemoryRegion *pci_address_space,
+                    MemoryRegion *ram_memory)
+{
+    DeviceState *dev;
+    PCIBus *b;
+    PCIDevice *d;
+    PCIHostState *s;
+    PIIX3State *piix3;
+    PCII440FXState *f;
+    unsigned i;
+    I440FXState *i440fx;
+
+    dev = qdev_create(NULL, TYPE_I440FX_PCI_HOST_BRIDGE);
+    s = PCI_HOST_BRIDGE(dev);
+    b = pci_bus_new(dev, NULL, pci_address_space,
+                    address_space_io, 0, TYPE_PCI_BUS);
+    s->bus = b;
+    object_property_add_child(qdev_get_machine(), "i440fx", OBJECT(dev), NULL);
+    qdev_init_nofail(dev);
+
+    d = pci_create_simple(b, 0, TYPE_I440FX_XEN_PCI_DEVICE);
+    *pi440fx_state = I440FX_XEN_PCI_DEVICE(d);
+    f = *pi440fx_state;
+    f->system_memory = address_space_mem;
+    f->pci_address_space = pci_address_space;
+    f->ram_memory = ram_memory;
+
+    i440fx = I440FX_PCI_HOST_BRIDGE(dev);
+    i440fx->pci_info.w32.begin = below_4g_mem_size;
+
+    /* setup pci memory mapping */
+    pc_pci_as_mapping_init(OBJECT(f), f->system_memory,
+                           f->pci_address_space);
+
+    memory_region_init_alias(&f->smram_region, OBJECT(d), "smram-region",
+                             f->pci_address_space, 0xa0000, 0x20000);
+    memory_region_add_subregion_overlap(f->system_memory, 0xa0000,
+                                        &f->smram_region, 1);
+    memory_region_set_enabled(&f->smram_region, false);
+    init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
+             &f->pam_regions[0], PAM_BIOS_BASE, PAM_BIOS_SIZE);
+    for (i = 0; i < 12; ++i) {
+        init_pam(dev, f->ram_memory, f->system_memory, f->pci_address_space,
+                 &f->pam_regions[i+1], PAM_EXPAN_BASE + i * PAM_EXPAN_SIZE,
+                 PAM_EXPAN_SIZE);
+    }
+
+    /* Xen supports additional interrupt routes from the PCI devices to
+     * the IOAPIC: the four pins of each PCI device on the bus are also
+     * connected to the IOAPIC directly.
+     * These additional routes can be discovered through ACPI. */
+    piix3 = DO_UPCAST(PIIX3State, dev,
+            pci_create_simple_multifunction(b, -1, true, "PIIX3-xen"));
+    pci_bus_irqs(b, xen_piix3_set_irq, xen_pci_slot_get_pirq,
+            piix3, XEN_PIIX_NUM_PIRQS);
+    piix3->pic = pic;
+    *isa_bus = ISA_BUS(qdev_get_child_bus(DEVICE(piix3), "isa.0"));
+
+    *piix3_devfn = piix3->dev.devfn;
+
+    ram_size = ram_size / 8 / 1024 / 1024;
+    if (ram_size > 255) {
+        ram_size = 255;
+    }
+    d->config[0x57] = ram_size;
+
+    i440fx_update_memory_mappings(f);
+
+    return b;
+}
+
 PCIBus *find_i440fx(void)
 {
     PCIHostState *s = OBJECT_CHECK(PCIHostState,
diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 1c0c382..51656d9 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -239,6 +239,16 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn,
                     MemoryRegion *pci_memory,
                     MemoryRegion *ram_memory);
 
+PCIBus *xen_igd_i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn,
+                    ISABus **isa_bus, qemu_irq *pic,
+                    MemoryRegion *address_space_mem,
+                    MemoryRegion *address_space_io,
+                    ram_addr_t ram_size,
+                    ram_addr_t below_4g_mem_size,
+                    ram_addr_t above_4g_mem_size,
+                    MemoryRegion *pci_memory,
+                    MemoryRegion *ram_memory);
+
 PCIBus *find_i440fx(void);
 /* piix4.c */
 extern PCIDevice *piix4_dev;
-- 
1.9.1