setup_e820() is executed after UEFI's ExitBootService has been called. This causes the firmware to throw an exception because Console IO protocol handler is supposed to work only during boot service environment. As per UEFI 2.9, section 12.1: "This protocol isused to handle input and output of text-based information intended for the system user during the operation of code in the boot services environment." Running a TDX guest with TDVF with unaccepted memory disabled results in the following output: !!!! X64 Exception Type - 06(#UD - Invalid Opcode) CPU Apic ID - 00000000 !!!! RIP - 0000000000603D51, CS - 0000000000000038, RFLAGS - 0000000000010046 RAX - 0000000000000000, RCX - 0000000000000000, RDX - 000000007EC27530 RBX - 0000000001C227A1, RSP - 000000007EC274D8, RBP - 000000007EC27530 RSI - 000000000000000A, RDI - 000000007EC27530 R8 - 00000000AC1C4720, R9 - 000000007D2C5F18, R10 - 0000000000400000 R11 - 0000000000000000, R12 - 0000000001C22B0E, R13 - 0000000000000000 R14 - 0000000000000032, R15 - 000000007C6022D0 DS - 0000000000000030, ES - 0000000000000030, FS - 0000000000000030 GS - 0000000000000030, SS - 0000000000000030 CR0 - 0000000080010031, CR2 - 0000000000000000, CR3 - 000000007EA01000 CR4 - 0000000000000268, CR8 - 0000000000000000 DR0 - 0000000000000000, DR1 - 0000000000000000, DR2 - 0000000000000000 DR3 - 0000000000000000, DR6 - 00000000FFFF0FF0, DR7 - 0000000000000400 GDTR - 000000007E7E6000 0000000000000047, LDTR - 0000000000000000 IDTR - 000000007D2BD018 0000000000000FFF, TR - 0000000000000000 FXSAVE_STATE - 000000007EC27130 !!!! Can't find image information. !!!! Signed-off-by: Nikolay Borisov <nik.borisov@xxxxxxxx> --- drivers/firmware/efi/libstub/x86-stub.c | 5 +---- 1 file changed, 1 insertion(+), 4 deletions(-) diff --git a/drivers/firmware/efi/libstub/x86-stub.c b/drivers/firmware/efi/libstub/x86-stub.c index 2fee52ed335d..3b8bccd7c216 100644 --- a/drivers/firmware/efi/libstub/x86-stub.c +++ b/drivers/firmware/efi/libstub/x86-stub.c @@ -605,11 +605,8 @@ setup_e820(struct boot_params *params, struct setup_data *e820ext, u32 e820ext_s break; case EFI_UNACCEPTED_MEMORY: - if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) { - efi_warn_once( -"The system has unaccepted memory, but kernel does not support it\nConsider enabling CONFIG_UNACCEPTED_MEMORY\n"); + if (!IS_ENABLED(CONFIG_UNACCEPTED_MEMORY)) continue; - } e820_type = E820_TYPE_RAM; process_unaccepted_memory(d->phys_addr, d->phys_addr + PAGE_SIZE * d->num_pages); -- 2.34.1