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

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Message-ID: <874l3sz5z4.fsf@firstfloor.org>
Date:   Thu, 11 Jul 2019 13:11:43 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     Alexandre Chartre <alexandre.chartre@...cle.com>
Cc:     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

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.

-Andi