Re: [Xen-devel] strange behavior with Multiboot2 on EFI

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.06.18 at 12:11, <kristaps.civkulis@xxxxxxxxx> wrote:
>>  As you should have a xen.efi available from that same build, could
>> you try running that (from the EFI shell) instead? Sadly there's no way
>> to bypass the call in the multiboot2 case, while with xen.efi you could
>> pass "/basevideo" to prevent the call from being made.
> 
> When I launched QEMU I pressed ESC to get into UEFI menu.
> While in UEFI menu I did:
> Boot Maintainance Manager -> Boot Options -> Add Boot Option -> chose
> xen.efi file and in Input Optional Data I added /basevideo . Saved
> changes and then booted this new entry.
> After few seconds QEMU crashed with following output:
> 
> qemu: fatal: Trying to execute code outside RAM or ROM at 0x00000000000b0000
> RAX=0000000000000000 RBX=000000007e622418 RCX=0000000000000000
> RDX=000000007ff09320
> RSI=000000007d86e368 RDI=000000007e622418 RBP=000000007ff09370
> RSP=000000007ff092c8
> R8 =000000007ff276bf R9 =000000007e623298 R10=0000000000000011
> R11=0000000000000000
> R12=0000000000000001 R13=00000000003da367 R14=0000000000000009
> R15=0000000000000000
> RIP=00000000000affb8 RFL=00000246 [---Z-P-] CPL=0 II=0 A20=1 SMM=0 HLT=0

RIP is clearly fishy, but without any dump of the stack one can't even guess
how execution made it there.

Jan



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