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piix: fix 32bit pci hole

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Make the 32bit pci hole start at end of ram, so all possible address
space is covered.

We used to try and make addresses aligned so they are easier to cover
with MTRRs, but since they are cosmetic on KVM, this is probably not
worth worrying about.
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>
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Gerd Hoffmann 2013-12-21 03:02:50 +01:00 committed by Michael S. Tsirkin
parent dcc209314a
commit ddaaefb4dd
3 changed files with 4 additions and 9 deletions
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1
hw/i386/pc_piix.c
View File

@ -170,6 +170,7 @@ 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 {

11
hw/pci-host/piix.c
View File

@ -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
include/hw/i386/pc.h
View File

@ -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);