Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Tue, 14 May 2019 09:21:10 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Andy Lutomirski <luto@kernel.org>
Cc:     Liran Alon <liran.alon@oracle.com>,
        Alexandre Chartre <alexandre.chartre@oracle.com>,
        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>,
        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, Jonathan Adams <jwadams@google.com>
Subject: Re: [RFC KVM 24/27] kvm/isolation: KVM page fault handler
Message-ID: <20190514072110.GF2589@hirez.programming.kicks-ass.net>
References: <1557758315-12667-1-git-send-email-alexandre.chartre@oracle.com>
 <1557758315-12667-25-git-send-email-alexandre.chartre@oracle.com>
 <20190513151500.GY2589@hirez.programming.kicks-ass.net>
 <13F2FA4F-116F-40C6-9472-A1DE689FE061@oracle.com>
 <CALCETrUcR=3nfOtFW2qt3zaa7CnNJWJLqRY8AS9FTJVHErjhfg@mail.gmail.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <CALCETrUcR=3nfOtFW2qt3zaa7CnNJWJLqRY8AS9FTJVHErjhfg@mail.gmail.com>
User-Agent: Mutt/1.10.1 (2018-07-13)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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.