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@@ -1,129 +0,0 @@
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-From 921c78f57a16b00debd58899a48e7045015c374b Mon Sep 17 00:00:00 2001
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-From: Ard Biesheuvel <ardb@kernel.org>
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-Date: Mon, 17 Jun 2024 17:07:41 +0200
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-Subject: [PATCH] OvmfPkg/QemuVideoDxe: add feature PCD to remap framebuffer
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- W/C
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-
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-Some platforms (such as SBSA-QEMU on recent builds of the emulator) only
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-tolerate misaligned accesses to normal memory, and raise alignment
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-faults on such accesses to device memory, which is the default for PCIe
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-MMIO BARs.
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-
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-When emulating a PCIe graphics controller, the framebuffer is typically
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-exposed via a MMIO BAR, while the disposition of the region is closer to
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-memory (no side effects on reads or writes, except for the changing
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-picture on the screen; direct random access to any pixel in the image).
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-
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-In order to permit the use of such controllers on platforms that only
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-tolerate these types of accesses for normal memory, it is necessary to
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-remap the memory. Use the DXE services to set the desired capabilities
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-and attributes.
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-
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-Hide this behavior under a feature PCD so only platforms that really
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-need it can enable it. (OVMF on x86 has no need for this)
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-
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-Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
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-Upstream: https://github.com/tianocore/edk2/commit/c1d1910be6e04a8b1a73090cf2881fb698947a6e
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-Signed-off-by: Romain Naour <romain.naour@smile.fr>
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----
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- OvmfPkg/OvmfPkg.dec | 5 +++++
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- OvmfPkg/QemuVideoDxe/Gop.c | 19 +++++++++++++++++++
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- OvmfPkg/QemuVideoDxe/Qemu.h | 2 +-
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- OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf | 4 ++++
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- 4 files changed, 29 insertions(+), 1 deletion(-)
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-
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-diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec
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-index 51be9a5959..2c40de8a13 100644
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---- a/OvmfPkg/OvmfPkg.dec
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-+++ b/OvmfPkg/OvmfPkg.dec
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-@@ -444,3 +444,8 @@
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-
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- ## This feature flag indicates the firmware build supports secure boot.
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- gUefiOvmfPkgTokenSpaceGuid.PcdSecureBootSupported|FALSE|BOOLEAN|0x6d
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-+
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-+ ## Whether QemuVideoDxe should perform a EFI_MEMORY_WC remap of the PCI
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-+ # framebuffer. This might be required on platforms that do not tolerate
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-+ # misaligned accesses otherwise.
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-+ gUefiOvmfPkgTokenSpaceGuid.PcdRemapFrameBufferWriteCombine|FALSE|BOOLEAN|0x75
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-diff --git a/OvmfPkg/QemuVideoDxe/Gop.c b/OvmfPkg/QemuVideoDxe/Gop.c
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-index b11eed7558..a29c025afd 100644
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---- a/OvmfPkg/QemuVideoDxe/Gop.c
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-+++ b/OvmfPkg/QemuVideoDxe/Gop.c
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-@@ -9,6 +9,8 @@
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-
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- #include "Qemu.h"
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-
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-+#include <Library/DxeServicesTableLib.h>
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-+
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- STATIC
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- VOID
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- QemuVideoCompleteModeInfo (
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-@@ -54,6 +56,7 @@ QemuVideoCompleteModeData (
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- EFI_GRAPHICS_OUTPUT_MODE_INFORMATION *Info;
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- EFI_ACPI_ADDRESS_SPACE_DESCRIPTOR *FrameBufDesc;
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- QEMU_VIDEO_MODE_DATA *ModeData;
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-+ EFI_STATUS Status;
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-
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- ModeData = &Private->ModeData[Mode->Mode];
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- Info = Mode->Info;
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-@@ -79,6 +82,22 @@ QemuVideoCompleteModeData (
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- (UINT64)Mode->FrameBufferSize
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- ));
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-
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-+ if (FeaturePcdGet (PcdRemapFrameBufferWriteCombine)) {
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-+ Status = gDS->SetMemorySpaceCapabilities (
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-+ FrameBufDesc->AddrRangeMin,
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-+ FrameBufDesc->AddrLen,
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-+ EFI_MEMORY_UC | EFI_MEMORY_WC | EFI_MEMORY_XP
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-+ );
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-+ ASSERT_EFI_ERROR (Status);
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-+
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-+ Status = gDS->SetMemorySpaceAttributes (
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-+ FrameBufDesc->AddrRangeMin,
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-+ FrameBufDesc->AddrLen,
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-+ EFI_MEMORY_WC | EFI_MEMORY_XP
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-+ );
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-+ ASSERT_EFI_ERROR (Status);
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-+ }
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-+
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- FreePool (FrameBufDesc);
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- return EFI_SUCCESS;
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- }
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-diff --git a/OvmfPkg/QemuVideoDxe/Qemu.h b/OvmfPkg/QemuVideoDxe/Qemu.h
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-index 57341a0bbf..a3da725fbf 100644
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---- a/OvmfPkg/QemuVideoDxe/Qemu.h
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-+++ b/OvmfPkg/QemuVideoDxe/Qemu.h
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-@@ -13,7 +13,7 @@
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- #ifndef _QEMU_H_
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- #define _QEMU_H_
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-
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--#include <Uefi.h>
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-+#include <PiDxe.h>
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- #include <Protocol/GraphicsOutput.h>
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- #include <Protocol/PciIo.h>
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- #include <Protocol/DriverSupportedEfiVersion.h>
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-diff --git a/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf b/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf
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-index 43a6e07faa..4c0870171b 100644
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---- a/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf
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-+++ b/OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf
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-@@ -44,6 +44,7 @@
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-
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- [LibraryClasses]
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- BaseMemoryLib
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-+ DxeServicesTableLib
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- FrameBufferBltLib
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- DebugLib
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- DevicePathLib
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-@@ -61,6 +62,9 @@
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- gEfiDevicePathProtocolGuid # PROTOCOL BY_START
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- gEfiPciIoProtocolGuid # PROTOCOL TO_START
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-
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-+[FeaturePcd]
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-+ gUefiOvmfPkgTokenSpaceGuid.PcdRemapFrameBufferWriteCombine
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-+
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- [Pcd]
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- gUefiOvmfPkgTokenSpaceGuid.PcdOvmfHostBridgePciDevId
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- gUefiOvmfPkgTokenSpaceGuid.PcdVideoResolutionSource
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---
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-2.45.0
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-
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Romain Naour