Re: [Xen-devel] Failed vm entry with heavy use of emulator

[Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>]

On 01/05/2016 03:49 PM, Andrew Cooper wrote:
> On 05/01/16 13:39, Razvan Cojocaru wrote:
>> Here's a quick log of the emulated instructions on my setup:
>> http://pastebin.com/raw/XXQ0Lnzh
> 
> Hmm - according to that, the final instruction emulated was
> 
> d1v0 32bit @ 0008:828925db -> fa
> 
> which is the 'cli' instruction.
> 
> I would start there - I doubt it is an instruction which is emulated often.

My code (arch/x86/x86_emulate/x86_emulate.c) does have a case label for it:

3677     case 0xfa: /* cli */
3678         generate_exception_if(!mode_iopl(), EXC_GP, 0);
3679         _regs.eflags &= ~EFLG_IF;
3680         break;

Maybe the IOPL test fails there? Tamas, does your guest die after a CLI
as well?


Thanks,
Razvan

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