[Qemu-devel] [PATCH v3] piix: fix 32bit pci hole

[Laszlo Ersek <lersek@redhat.com>]

From: Gerd Hoffmann <kraxel@redhat.com>

Make the 32bit pci hole start at end of ram, so all possible address
space is covered.  Of course the firmware can use less than that.
Leaving space unused is no problem, mapping pci bars outside the
hole causes problems though.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Forward ported to 83d08f26 ("pc: map PCI address space as catchall region
for not mapped addresses").

Signed-off-by: Laszlo Ersek <lersek@redhat.com>
---
 include/hw/i386/pc.h |  1 +
 hw/i386/pc_piix.c    |  1 +
 hw/pci-host/piix.c   | 11 ++---------
 3 files changed, 4 insertions(+), 9 deletions(-)

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 24eb3de..eb3da96 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -182,6 +182,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state, int *piix_devfn,
                     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);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 4e0dae7..eed892b 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -157,6 +157,7 @@ static void pc_init1(QEMUMachineInitArgs *args,
     if (pci_enabled) {
         pci_bus = i440fx_init(&i440fx_state, &piix3_devfn, &isa_bus, gsi,
                               system_memory, system_io, args->ram_size,
+                              below_4g_mem_size,
                               above_4g_mem_size,
                               pci_memory, ram_memory);
     } else {
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 63be7f6..4229d09 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -311,6 +311,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
                     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)
@@ -340,15 +341,7 @@ PCIBus *i440fx_init(PCII440FXState **pi440fx_state,
     f->ram_memory = ram_memory;
 
     i440fx = I440FX_PCI_HOST_BRIDGE(dev);
-    /* Set PCI window size the way seabios has always done it. */
-    /* Power of 2 so bios can cover it with a single MTRR */
-    if (ram_size <= 0x80000000) {
-        i440fx->pci_info.w32.begin = 0x80000000;
-    } else if (ram_size <= 0xc0000000) {
-        i440fx->pci_info.w32.begin = 0xc0000000;
-    } else {
-        i440fx->pci_info.w32.begin = 0xe0000000;
-    }
+    i440fx->pci_info.w32.begin = below_4g_mem_size;
 
     /* setup pci memory mapping */
     pc_pci_as_mapping_init(OBJECT(f), f->system_memory,
-- 
1.8.3.1