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pc: map PCI address space as catchall region for not mapped addresses

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With a help of negative memory region priority PCI address space
is mapped underneath RAM regions effectively catching every access
to addresses not mapped by any other region.
It simplifies PCI address space mapping into system address space.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2013-10-29 13:57:34 +01:00
parent e689f7c668
commit 83d08f2673
6 changed files with 14 additions and 71 deletions
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20
hw/i386/pc.c
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@ -1093,21 +1093,13 @@ PcGuestInfo *pc_guest_info_init(ram_addr_t below_4g_mem_size,
return guest_info;
}
void pc_init_pci64_hole(PcPciInfo *pci_info, uint64_t pci_hole64_start,
uint64_t pci_hole64_size)
/* setup pci memory address space mapping into system address space */
void pc_pci_as_mapping_init(Object *owner, MemoryRegion *system_memory,
MemoryRegion *pci_address_space)
{
if ((sizeof(hwaddr) == 4) || (!pci_hole64_size)) {
return;
}
/*
* 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.
*/
pci_info->w64.begin = ROUND_UP(pci_hole64_start, 0x1ULL << 30);
pci_info->w64.end = pci_info->w64.begin + pci_hole64_size;
assert(pci_info->w64.begin <= pci_info->w64.end);
/* Set to lower priority than RAM */
memory_region_add_subregion_overlap(system_memory, 0x0,
pci_address_space, -1);
}
void pc_acpi_init(const char *default_dsdt)