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

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Date:   Thu, 11 Jul 2019 18:05:58 -0600
From:   Andy Lutomirski <luto@...capital.net>
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


> On Jul 11, 2019, at 8:25 AM, Alexandre Chartre <alexandre.chartre@...cle.com> wrote:
> 
> Address space isolation should be aborted if there is an interrupt,
> an exception or a context switch. Interrupt/exception handlers and
> context switch code need to run with the full kernel address space.
> Address space isolation is aborted by restoring the original CR3
> value used before entering address space isolation.
> 

NAK to the entry changes. That code you’re changing is already known to be a bit buggy, and it’s spaghetti. PeterZ and I are gradually working on fixing some bugs and C-ifying it. ASI can go on top.