linux-kernel - Re: [RFC KVM 24/27] kvm/isolation: KVM page fault handler

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Message-ID: <95f462d4-37d3-f863-b7c6-2bcbb92251ec@oracle.com>
Date:   Tue, 14 May 2019 17:36:51 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>
Cc:     Liran Alon <liran.alon@...cle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krcmar <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        kvm list <kvm@...r.kernel.org>, X86 ML <x86@...nel.org>,
        Linux-MM <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        jan.setjeeilers@...cle.com, Jonathan Adams <jwadams@...gle.com>
Subject: Re: [RFC KVM 24/27] kvm/isolation: KVM page fault handler


On 5/14/19 9:21 AM, Peter Zijlstra wrote:
> On Mon, May 13, 2019 at 07:02:30PM -0700, Andy Lutomirski wrote:
> 
>> This sounds like a great use case for static_call().  PeterZ, do you
>> suppose we could wire up static_call() with the module infrastructure
>> to make it easy to do "static_call to such-and-such GPL module symbol
>> if that symbol is in a loaded module, else nop"?
> 
> You're basically asking it to do dynamic linking. And I suppose that is
> technically possible.
> 
> However, I'm really starting to think kvm (or at least these parts of it
> that want to play these games) had better not be a module anymore.
> 

Maybe we can use an atomic notifier (e.g. page_fault_notifier)?

alex.