x86_64+kvm: int_exception_handler() Exception 13 while executing option rom

From: Vitaly Chikunov vt@altlinux.org

I noticed that u-boot.rom does not boot in qemu-system-x86_64 (8.2.4) with KVM accelerator:

  builder@x86_64:~/RPM/BUILD/u-boot-qemu-2024.07$ qemu-system-x86_64 -M accel=kvm -nographic -bios ./u-boot.rom
  
  U-Boot SPL 2024.07 (Jul 04 2024 - 09:26:24 +0000)
  int_exception_handler() Exception 13 while executing option rom
  <hangs>

The same rom with -M accel=tcg boots OK[1].

Thanks,

[1] ps. Log of TCG boot:

  builder@x86_64:~/RPM/BUILD/u-boot-qemu-2024.07$ qemu-system-x86_64 -M accel=tcg -nographic -bios ./u-boot.rom

  U-Boot SPL 2024.07 (Jul 04 2024 - 09:26:24 +0000)
  Video: 1024x768x32
	  alloc_simple() alloc space exhausted
  Trying to boot from SPI
  Jumping to 64-bit U-Boot: Note many features are missing


  U-Boot 2024.07 (Jul 04 2024 - 09:26:24 +0000)

  CPU:   QEMU Virtual CPU version 2.5+
  DRAM:  128 MiB
  Core:  20 devices, 13 uclasses, devicetree: separate
  Loading Environment from nowhere... OK
  Video: 1024x768x0
  Model: QEMU x86 (I440FX)
  Net:   e1000: 52:54:00:12:34:56
	 eth0: e1000#0

  Hit any key to stop autoboot:  0
  Scanning for bootflows in all bootdevs
  Seq  Method       State   Uclass    Part  Name                      Filename
  ---  -----------  ------  --------  ----  ------------------------  ----------------
  Scanning global bootmeth 'efi_mgr':
  efi_set_blk_dev_to_system_partition() No EFI system partition
  efi_set_blk_dev_to_system_partition() No EFI system partition
       efi_var_to_file() Failed to persist EFI variables
  Hunting with: nvme
  Hunting with: qfw
  Hunting with: scsi
  scanning bus for devices...
  Hunting with: virtio
  Scanning bootdev 'qfw_pio.bootdev':
  fatal: no kernel available
  Hunting with: ide
  Bus 0: not available  Bus 1: OK
    Device 2: Model: QEMU Firm: 2.5+ Ser#: QEMU DVD-ROM
	      Type: Removable CD ROM
	      Capacity: not available
    Device 3: not available
  Hunting with: usb
  No USB controllers found
  Hunting with: ethernet
  BOOTP broadcast 1
  BOOTP broadcast 2
  BOOTP broadcast 3
  DHCP client bound to address 10.0.2.15 (1001 ms)
  Scanning bootdev 'e1000#0.bootdev':
  BOOTP broadcast 1
  BOOTP broadcast 2
  BOOTP broadcast 3
  DHCP client bound to address 10.0.2.15 (1000 ms)
  *** Warning: no boot file name; using '0A00020F.img'
  Using e1000#0 device
  TFTP from server 10.0.2.2; our IP address is 10.0.2.15
  Filename '0A00020F.img'.
  Load address: 0x1000000
  Loading: *
  TFTP error: 'Access violation' (2)
  Not retrying...
  No more bootdevs
  ---  -----------  ------  --------  ----  ------------------------  ----------------
  (0 bootflows, 0 valid)
  =>

Link: https://lore.kernel.org/all/20240707024125.npvtj43nnddv7uwu@altlinux.org/T/