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Revert "OvmfPkg/PlatformPei: assign PciSize on both i440fx/q35 branches explicitly"

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This reverts commit 60e95bf5094fbb9b728729ccfaf32184b3662317.

The original fix for <https://bugzilla.tianocore.org/show_bug.cgi?id=1814>
triggered a bug / incorrect assumption in QEMU.

QEMU assumes that the PCIEXBAR is below the 32-bit PCI window, not above
it. When the firmware doesn't satisfy this assumption, QEMU generates an
\_SB.PCI0._CRS object in the ACPI DSDT that does not reflect the
firmware's 32-bit MMIO BAR assignments. This causes OSes to re-assign
32-bit MMIO BARs.

Working around the problem in the firmware looks less problematic than
fixing QEMU. Revert the original changes first, before implementing an
alternative fix.

Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=1859
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com>
This commit is contained in:
Laszlo Ersek 2019-05-29 11:52:03 +02:00
parent 753d3d6f43
commit d453498411
1 changed files with 1 additions and 2 deletions
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3
OvmfPkg/PlatformPei/Platform.c
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@ -190,10 +190,8 @@ MemMapInitialization (
ASSERT (TopOfLowRam <= PciExBarBase);
ASSERT (PciExBarBase <= MAX_UINT32 - SIZE_256MB);
PciBase = (UINT32)(PciExBarBase + SIZE_256MB);
PciSize = 0xFC000000 - PciBase;
} else {
PciBase = (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam;
PciSize = 0xFC000000 - PciBase;
}
//
@ -209,6 +207,7 @@ MemMapInitialization (
// 0xFED20000 gap 896 KB
// 0xFEE00000 LAPIC 1 MB
//
PciSize = 0xFC000000 - PciBase;
AddIoMemoryBaseSizeHob (PciBase, PciSize);
PcdStatus = PcdSet64S (PcdPciMmio32Base, PciBase);
ASSERT_RETURN_ERROR (PcdStatus);