One of the reasons for introducing virtio-gpu support to OvmfPkg and ArmVirtpkg was the fact that under KVM virtualization on ARM, the legacy VGA cannot be used reliably. This is due to an implementation detail of QEMU+KVM, which remaps cached host memory into the guest address space as a framebuffer behind a PCI BAR. Given that the purpose of a memory mapped framebuffer is its side effects, such BARs should never be mapped cacheable in the guest, and the mismatched attributes between host and guest result in a loss of coherency, visible as corruption in the framebuffer image.
This issue does not occur under TCG emulation, nor did we expect it to actually bring down the guest under KVM, and so it was deemed harmless to keep support for the VGA device as well. However, as it turns out, the fact that the framebuffer BAR is mapped using device semantics by default may result in unalignment faults when we use the ordinary string copy routines on the contents. In theory, we could work around this by remapping the BAR as write combining, but it appears the generic PCI bus driver does not actually implement this. So let's remove the QemuVideoDxe driver altogether. This may result in loss of functionality for use cases that rely on the framebuffer to be directly addressable (such as EFIFB), but given that this never worked reliably under KVM in the first place, let's not let that stop us from dropping support for it. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Ard Biesheuvel <[email protected]> --- ArmVirtPkg/ArmVirtQemu.dsc | 2 -- ArmVirtPkg/ArmVirtQemuFvMain.fdf.inc | 1 - ArmVirtPkg/ArmVirtQemuKernel.dsc | 2 -- 3 files changed, 5 deletions(-) diff --git a/ArmVirtPkg/ArmVirtQemu.dsc b/ArmVirtPkg/ArmVirtQemu.dsc index e23a6d17bc44..2e6e76224987 100644 --- a/ArmVirtPkg/ArmVirtQemu.dsc +++ b/ArmVirtPkg/ArmVirtQemu.dsc @@ -57,7 +57,6 @@ BootLogoLib|MdeModulePkg/Library/BootLogoLib/BootLogoLib.inf PlatformBootManagerLib|ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf CustomizedDisplayLib|MdeModulePkg/Library/CustomizedDisplayLib/CustomizedDisplayLib.inf - FrameBufferBltLib|MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.inf QemuBootOrderLib|OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf FileExplorerLib|MdeModulePkg/Library/FileExplorerLib/FileExplorerLib.inf PciPcdProducerLib|ArmVirtPkg/Library/FdtPciPcdProducerLib/FdtPciPcdProducerLib.inf @@ -357,7 +356,6 @@ # # Video support # - OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf OvmfPkg/VirtioGpuDxe/VirtioGpu.inf OvmfPkg/PlatformDxe/Platform.inf diff --git a/ArmVirtPkg/ArmVirtQemuFvMain.fdf.inc b/ArmVirtPkg/ArmVirtQemuFvMain.fdf.inc index 237b2d03a714..3194aa3edc8e 100644 --- a/ArmVirtPkg/ArmVirtQemuFvMain.fdf.inc +++ b/ArmVirtPkg/ArmVirtQemuFvMain.fdf.inc @@ -167,7 +167,6 @@ READ_LOCK_STATUS = TRUE # # Video support # - INF OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf INF OvmfPkg/VirtioGpuDxe/VirtioGpu.inf INF OvmfPkg/PlatformDxe/Platform.inf diff --git a/ArmVirtPkg/ArmVirtQemuKernel.dsc b/ArmVirtPkg/ArmVirtQemuKernel.dsc index aa01debfda69..69de887277cb 100644 --- a/ArmVirtPkg/ArmVirtQemuKernel.dsc +++ b/ArmVirtPkg/ArmVirtQemuKernel.dsc @@ -57,7 +57,6 @@ BootLogoLib|MdeModulePkg/Library/BootLogoLib/BootLogoLib.inf PlatformBootManagerLib|ArmVirtPkg/Library/PlatformBootManagerLib/PlatformBootManagerLib.inf CustomizedDisplayLib|MdeModulePkg/Library/CustomizedDisplayLib/CustomizedDisplayLib.inf - FrameBufferBltLib|MdeModulePkg/Library/FrameBufferBltLib/FrameBufferBltLib.inf QemuBootOrderLib|OvmfPkg/Library/QemuBootOrderLib/QemuBootOrderLib.inf FileExplorerLib|MdeModulePkg/Library/FileExplorerLib/FileExplorerLib.inf PciPcdProducerLib|ArmVirtPkg/Library/FdtPciPcdProducerLib/FdtPciPcdProducerLib.inf @@ -348,7 +347,6 @@ # # Video support # - OvmfPkg/QemuVideoDxe/QemuVideoDxe.inf OvmfPkg/VirtioGpuDxe/VirtioGpu.inf OvmfPkg/PlatformDxe/Platform.inf -- 2.11.0 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
