Re: [RFC v2 02/26] mm/asi: Abort isolation on interrupt, exception and context switch

[Mike Rapoport]

On Thu, Jul 11, 2019 at 01:11:43PM -0700, Andi Kleen wrote:
> Alexandre Chartre <alexandre.chartre@xxxxxxxxxx> writes:
> >  	jmp	paranoid_exit
> > @@ -1182,6 +1196,16 @@ ENTRY(paranoid_entry)
> >  	xorl	%ebx, %ebx
> >  
> >  1:
> > +#ifdef CONFIG_ADDRESS_SPACE_ISOLATION
> > +	/*
> > +	 * If address space isolation is active then abort it and return
> > +	 * the original kernel CR3 in %r14.
> > +	 */
> > +	ASI_START_ABORT_ELSE_JUMP 2f
> > +	movq	%rdi, %r14
> > +	ret
> > +2:
> > +#endif
> 
> Unless I missed it you don't map the exception stacks into ASI, so it
> has likely already triple faulted at this point.

The exception stacks are in the CPU entry area, aren't they?
 
> -Andi
> 

-- 
Sincerely yours,
Mike.