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authorLaszlo Ersek <lersek@redhat.com>2019-05-29 11:51:26 +0200
committerLaszlo Ersek <lersek@redhat.com>2019-06-03 19:54:01 +0200
commiteb4d62b0779c3a5766174e4373c95a8b6a967cb7 (patch)
tree6738d11ea384c8574b4b475c8eb83e538a4f47e6 /OvmfPkg
parent305cd4f783fe522230677677d17ae7adc85ebc4b (diff)
downloadedk2-eb4d62b0779c3a5766174e4373c95a8b6a967cb7.tar.gz
edk2-eb4d62b0779c3a5766174e4373c95a8b6a967cb7.tar.bz2
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Revert "OvmfPkg/PlatformPei: reorder the 32-bit PCI window vs. the PCIEXBAR on q35"
This reverts commit 75136b29541b0e093a51d2e2c2af8d19855c2b60. 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> Reviewed-by: Philippe Mathieu-Daude <philmd@redhat.com> Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Diffstat (limited to 'OvmfPkg')
-rw-r--r--OvmfPkg/OvmfPkgIa32.dsc5
-rw-r--r--OvmfPkg/OvmfPkgIa32X64.dsc5
-rw-r--r--OvmfPkg/OvmfPkgX64.dsc5
-rw-r--r--OvmfPkg/PlatformPei/Platform.c9
4 files changed, 17 insertions, 7 deletions
diff --git a/OvmfPkg/OvmfPkgIa32.dsc b/OvmfPkg/OvmfPkgIa32.dsc
index b3446ece31..578fc6c98e 100644
--- a/OvmfPkg/OvmfPkgIa32.dsc
+++ b/OvmfPkg/OvmfPkgIa32.dsc
@@ -490,7 +490,10 @@
# This PCD is used to set the base address of the PCI express hierarchy. It
# is only consulted when OVMF runs on Q35. In that case it is programmed into
# the PCIEXBAR register.
- gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0xE0000000
+ #
+ # On Q35 machine types that QEMU intends to support in the long term, QEMU
+ # never lets the RAM below 4 GB exceed 2 GB.
+ gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0x80000000
!ifdef $(SOURCE_DEBUG_ENABLE)
gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugLoadImageMethod|0x2
diff --git a/OvmfPkg/OvmfPkgIa32X64.dsc b/OvmfPkg/OvmfPkgIa32X64.dsc
index 679d4eb8dd..eade8f62d3 100644
--- a/OvmfPkg/OvmfPkgIa32X64.dsc
+++ b/OvmfPkg/OvmfPkgIa32X64.dsc
@@ -495,7 +495,10 @@
# This PCD is used to set the base address of the PCI express hierarchy. It
# is only consulted when OVMF runs on Q35. In that case it is programmed into
# the PCIEXBAR register.
- gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0xE0000000
+ #
+ # On Q35 machine types that QEMU intends to support in the long term, QEMU
+ # never lets the RAM below 4 GB exceed 2 GB.
+ gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0x80000000
!ifdef $(SOURCE_DEBUG_ENABLE)
gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugLoadImageMethod|0x2
diff --git a/OvmfPkg/OvmfPkgX64.dsc b/OvmfPkg/OvmfPkgX64.dsc
index 56a9560262..733a4c9d8a 100644
--- a/OvmfPkg/OvmfPkgX64.dsc
+++ b/OvmfPkg/OvmfPkgX64.dsc
@@ -495,7 +495,10 @@
# This PCD is used to set the base address of the PCI express hierarchy. It
# is only consulted when OVMF runs on Q35. In that case it is programmed into
# the PCIEXBAR register.
- gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0xE0000000
+ #
+ # On Q35 machine types that QEMU intends to support in the long term, QEMU
+ # never lets the RAM below 4 GB exceed 2 GB.
+ gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress|0x80000000
!ifdef $(SOURCE_DEBUG_ENABLE)
gEfiSourceLevelDebugPkgTokenSpaceGuid.PcdDebugLoadImageMethod|0x2
diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platform.c
index fd8eccaf3e..9c013613a1 100644
--- a/OvmfPkg/PlatformPei/Platform.c
+++ b/OvmfPkg/PlatformPei/Platform.c
@@ -184,13 +184,14 @@ MemMapInitialization (
PciBase = (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam;
if (mHostBridgeDevId == INTEL_Q35_MCH_DEVICE_ID) {
//
- // The 32-bit PCI host aperture is expected to fall between the top of
- // low RAM and the base of the MMCONFIG area.
+ // The MMCONFIG area is expected to fall between the top of low RAM and
+ // the base of the 32-bit PCI host aperture.
//
PciExBarBase = FixedPcdGet64 (PcdPciExpressBaseAddress);
- ASSERT (PciBase < PciExBarBase);
+ ASSERT (TopOfLowRam <= PciExBarBase);
ASSERT (PciExBarBase <= MAX_UINT32 - SIZE_256MB);
- PciSize = (UINT32)(PciExBarBase - PciBase);
+ PciBase = (UINT32)(PciExBarBase + SIZE_256MB);
+ PciSize = 0xFC000000 - PciBase;
} else {
PciSize = 0xFC000000 - PciBase;
}