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Gerd Hoffmann 638dfb4135 OvmfPkg/PciHotPlugInitDxe: fix io window size 
Smallest IO window size for PCI bridges is 0x1000.  Fix default size
accordingly.  Avoids broken resource assignments like this:

    [ ... ]
    PciBus: Resource Map for Root Bridge PciRoot(0x0)
    Type =   Io16; Base = 0x6000;   Length = 0x7000;        Alignment = 0xFFF
    [ ... ]
       Base = 0xC000;       Length = 0x200; Alignment = 0xFFF;      Owner = PPB [00|02|00:**]
       Base = 0xC200;       Length = 0x40;  Alignment = 0x3F;       Owner = PCI [00|1F|03:20]
       Base = 0xC240;       Length = 0x20;  Alignment = 0x1F;       Owner = PCI [00|1F|02:20]
    [ ... ]

... which the linux kernel fixes up later:

    [    0.644657] pci 0000:00:1f.3: BAR 4: assigned [io  0x1000-0x103f]
    [    0.646833] pci 0000:00:1f.2: BAR 4: assigned [io  0x1040-0x105f]

With the patch applied:

    { ... ]
    PciBus: Resource Map for Root Bridge PciRoot(0x0)
    Type =   Io16; Base = 0x6000;   Length = 0x8000;        Alignment = 0xFFF
    [ ... ]
       Base = 0xC000;       Length = 0x1000;        Alignment = 0xFFF;      Owner = PPB [00|02|00:**]
       Base = 0xD000;       Length = 0x40;  Alignment = 0x3F;       Owner = PCI [00|1F|03:20]
       Base = 0xD040;       Length = 0x20;  Alignment = 0x1F;       Owner = PCI [00|1F|02:20]
    [ ... ]

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
 		2023-06-26 11:08:31 +00:00
..
PciHotPlugInit.c OvmfPkg/PciHotPlugInitDxe: fix io window size 2023-06-26 11:08:31 +00:00
PciHotPlugInit.inf
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