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From:   Andy Lutomirski <luto@kernel.org>
Date:   Mon, 13 May 2019 08:51:04 -0700
Message-ID: <CALCETrUzAjUFGd=xZRmCbyLfvDgC_WbPYyXB=OznwTkcV-PKNw@mail.gmail.com>
Subject: Re: [RFC KVM 06/27] KVM: x86: Exit KVM isolation on IRQ entry
To:     Alexandre Chartre <alexandre.chartre@oracle.com>
Cc:     Paolo Bonzini <pbonzini@redhat.com>,
        Radim Krcmar <rkrcmar@redhat.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Andrew Lutomirski <luto@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        kvm list <kvm@vger.kernel.org>, X86 ML <x86@kernel.org>,
        Linux-MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        jan.setjeeilers@oracle.com, Liran Alon <liran.alon@oracle.com>,
        Jonathan Adams <jwadams@google.com>
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On Mon, May 13, 2019 at 7:39 AM Alexandre Chartre
<alexandre.chartre@oracle.com> wrote:
>
> From: Liran Alon <liran.alon@oracle.com>
>
> Next commits will change most of KVM #VMExit handlers to run
> in KVM isolated address space. Any interrupt handler raised
> during execution in KVM address space needs to switch back
> to host address space.
>
> This patch makes sure that IRQ handlers will run in full
> host address space instead of KVM isolated address space.

IMO this needs to be somewhere a lot more central.  What about NMI and
MCE?  Or async page faults?  Or any other entry?

--Andy