1 files changed, 72 insertions, 2 deletions

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index e7ad93189d..e00f9dca29 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -989,6 +989,74 @@ void pc_cpus_init(const char *cpu_model, DeviceState *icc_bridge)
     }
 }
 
+/* pci-info ROM file. Little endian format */
+typedef struct PcRomPciInfo {
+    uint64_t w32_min;
+    uint64_t w32_max;
+    uint64_t w64_min;
+    uint64_t w64_max;
+} PcRomPciInfo;
+
+static void pc_fw_cfg_guest_info(PcGuestInfo *guest_info)
+{
+    PcRomPciInfo *info;
+    if (!guest_info->has_pci_info) {
+        return;
+    }
+
+    info = g_malloc(sizeof *info);
+    info->w32_min = cpu_to_le64(guest_info->pci_info.w32.begin);
+    info->w32_max = cpu_to_le64(guest_info->pci_info.w32.end);
+    info->w64_min = cpu_to_le64(guest_info->pci_info.w64.begin);
+    info->w64_max = cpu_to_le64(guest_info->pci_info.w64.end);
+    /* Pass PCI hole info to guest via a side channel.
+     * Required so guest PCI enumeration does the right thing. */
+    fw_cfg_add_file(guest_info->fw_cfg, "etc/pci-info", info, sizeof *info);
+}
+
+typedef struct PcGuestInfoState {
+    PcGuestInfo info;
+    Notifier machine_done;
+} PcGuestInfoState;
+
+static
+void pc_guest_info_machine_done(Notifier *notifier, void *data)
+{
+    PcGuestInfoState *guest_info_state = container_of(notifier,
+                                                      PcGuestInfoState,
+                                                      machine_done);
+    pc_fw_cfg_guest_info(&guest_info_state->info);
+}
+
+PcGuestInfo *pc_guest_info_init(ram_addr_t below_4g_mem_size,
+                                ram_addr_t above_4g_mem_size)
+{
+    PcGuestInfoState *guest_info_state = g_malloc0(sizeof *guest_info_state);
+    PcGuestInfo *guest_info = &guest_info_state->info;
+
+    guest_info->pci_info.w32.end = IO_APIC_DEFAULT_ADDRESS;
+    if (sizeof(hwaddr) == 4) {
+        guest_info->pci_info.w64.begin = 0;
+        guest_info->pci_info.w64.end = 0;
+    } else {
+        /*
+         * BIOS does not set MTRR entries for the 64 bit window, so no need to
+         * align address to power of two.  Align address at 1G, this makes sure
+         * it can be exactly covered with a PAT entry even when using huge
+         * pages.
+         */
+        guest_info->pci_info.w64.begin =
+            ROUND_UP((0x1ULL << 32) + above_4g_mem_size, 0x1ULL << 30);
+        guest_info->pci_info.w64.end = guest_info->pci_info.w64.begin +
+            (0x1ULL << 62);
+        assert(guest_info->pci_info.w64.begin <= guest_info->pci_info.w64.end);
+    }
+
+    guest_info_state->machine_done.notify = pc_guest_info_machine_done;
+    qemu_add_machine_init_done_notifier(&guest_info_state->machine_done);
+    return guest_info;
+}
+
 void pc_acpi_init(const char *default_dsdt)
 {
     char *filename;
@@ -1030,7 +1098,8 @@ FWCfgState *pc_memory_init(MemoryRegion *system_memory,
                            ram_addr_t below_4g_mem_size,
                            ram_addr_t above_4g_mem_size,
                            MemoryRegion *rom_memory,
-                           MemoryRegion **ram_memory)
+                           MemoryRegion **ram_memory,
+                           PcGuestInfo *guest_info)
 {
     int linux_boot, i;
     MemoryRegion *ram, *option_rom_mr;
@@ -1082,6 +1151,7 @@ FWCfgState *pc_memory_init(MemoryRegion *system_memory,
     for (i = 0; i < nb_option_roms; i++) {
         rom_add_option(option_rom[i].name, option_rom[i].bootindex);
     }
+    guest_info->fw_cfg = fw_cfg;
     return fw_cfg;
 }
 
@@ -1240,7 +1310,7 @@ void pc_nic_init(ISABus *isa_bus, PCIBus *pci_bus)
         if (!pci_bus || (nd->model && strcmp(nd->model, "ne2k_isa") == 0)) {
             pc_init_ne2k_isa(isa_bus, nd);
         } else {
-            pci_nic_init_nofail(nd, "e1000", NULL);
+            pci_nic_init_nofail(nd, pci_bus, "e1000", NULL);
         }
     }
 }