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Kernel: Ignore an invalid QEMU multiboot entry

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This was introduced in the QEMU commit 8504f12 and was causing the
kernel to fail to boot on the q35 machine.

Fixes #14952.
This commit is contained in:
implicitfield 2022-12-06 23:47:45 +02:00 • committed by Linus Groh
parent 733a318709
commit 9665f41979
2 changed files with 12 additions and 7 deletions
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13
Kernel/Memory/MemoryManager.cpp
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@ -291,7 +291,18 @@ UNMAP_AFTER_INIT void MemoryManager::parse_memory_map()
global_data.physical_memory_ranges.append(PhysicalMemoryRange { PhysicalMemoryRangeType::Usable, start_address, length });
break;
case (MULTIBOOT_MEMORY_RESERVED):
global_data.physical_memory_ranges.append(PhysicalMemoryRange { PhysicalMemoryRangeType::Reserved, start_address, length });
#if ARCH(I386) || ARCH(X86_64)
// Workaround for https://gitlab.com/qemu-project/qemu/-/commit/8504f129450b909c88e199ca44facd35d38ba4de
// That commit added a reserved 12GiB entry for the benefit of virtual firmware.
// We can safely ignore this block as it isn't actually reserved on any real hardware.
// From: https://lore.kernel.org/all/20220701161014.3850-1-joao.m.martins@oracle.com/
// "Always add the HyperTransport range into e820 even when the relocation isn't
// done *and* there's >= 40 phys bit that would put max phyusical boundary to 1T
// This should allow virtual firmware to avoid the reserved range at the
// 1T boundary on VFs with big bars."
if (address != 0x000000fd00000000 || length != (0x000000ffffffffff - 0x000000fd00000000) + 1)
#endif
global_data.physical_memory_ranges.append(PhysicalMemoryRange { PhysicalMemoryRangeType::Reserved, start_address, length });
break;
case (MULTIBOOT_MEMORY_ACPI_RECLAIMABLE):
global_data.physical_memory_ranges.append(PhysicalMemoryRange { PhysicalMemoryRangeType::ACPI_Reclaimable, start_address, length });