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

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Message-Id: <20190711201706.GB20140@rapoport-lnx>
Date:   Thu, 11 Jul 2019 23:17:07 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     Alexandre Chartre <alexandre.chartre@...cle.com>,
        pbonzini@...hat.com, rkrcmar@...hat.com, tglx@...utronix.de,
        mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org,
        kvm@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, konrad.wilk@...cle.com,
        jan.setjeeilers@...cle.com, liran.alon@...cle.com,
        jwadams@...gle.com, graf@...zon.de, rppt@...ux.vnet.ibm.com
Subject: Re: [RFC v2 02/26] mm/asi: Abort isolation on interrupt, exception
 and context switch

On Thu, Jul 11, 2019 at 01:11:43PM -0700, Andi Kleen wrote:
> Alexandre Chartre <alexandre.chartre@...cle.com> 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.