Kernel: Ignore an invalid QEMU multiboot entry

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

Fixes #14952.

Kernel/Memory/MemoryManager.cpp

@@ -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 });

Meta/run.sh

@@ -121,11 +121,6 @@ if [ "$installed_major_version" -lt "$SERENITY_QEMU_MIN_REQ_MAJOR_VERSION" ] ||
     die
 fi
 
-# https://github.com/SerenityOS/serenity/issues/14952
-if [ "$installed_major_version" -ge 7 ] && [ "$installed_minor_version" -gt 0  ]; then
-    SERENITY_MACHINE_FORCE_VERSION_SEVEN_ZERO="-machine pc-i440fx-7.0"
-fi
-
 NATIVE_WINDOWS_QEMU="0"
 
 if command -v wslpath >/dev/null; then
@@ -267,7 +262,6 @@ if [ -z "$SERENITY_MACHINE" ]; then
         SERENITY_MACHINE="-M raspi3b -serial stdio"
     else
         SERENITY_MACHINE="
-        $SERENITY_MACHINE_FORCE_VERSION_SEVEN_ZERO
         -m $SERENITY_RAM_SIZE
         -smp $SERENITY_CPUS
         -display $SERENITY_QEMU_DISPLAY_BACKEND