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

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Message-ID: <20190514072110.GF2589@hirez.programming.kicks-ass.net>
Date:   Tue, 14 May 2019 09:21:10 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     Liran Alon <liran.alon@...cle.com>,
        Alexandre Chartre <alexandre.chartre@...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 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.