linux-kernel - Re: [RFC PATCH 00/13] XOM for KVM guest userspace

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Message-ID: <61e4e48b7986d889eeee80e6374834064049443c.camel@intel.com>
Date:   Wed, 30 Oct 2019 00:27:39 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "keescook@...omium.org" <keescook@...omium.org>
CC:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Dock, Deneen T" <deneen.t.dock@...el.com>,
        "Christopherson, Sean J" <sean.j.christopherson@...el.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "kristen@...ux.intel.com" <kristen@...ux.intel.com>,
        "luto@...nel.org" <luto@...nel.org>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Hansen, Dave" <dave.hansen@...el.com>
Subject: Re: [RFC PATCH 00/13] XOM for KVM guest userspace

On Tue, 2019-10-29 at 16:40 -0700, Kees Cook wrote:
> On Thu, Oct 03, 2019 at 02:23:47PM -0700, Rick Edgecombe wrote:
> > larger follow on to this enables setting the kernel text as XO, but this is
> > just
> 
> Is the kernel side series visible somewhere public yet?
> 
The POC from my Plumber's talk is up here:
https://github.com/redgecombe/linux/commits/exec_only

It doesn't work with this KVM series though as I made changes on the KVM side. I
don't consider it ready for posting on the list yet. Luckily though, PeterZ's
switching of ftrace to text_poke(), and your exception table patchset will make
it easier when the time comes.

Right now I am re-doing the KVM pieces to get rid of the memslot duplication. I
am ending up having to touch a lot more KVM mmu code, and it's taken some time
to work through. Then I wanted get some more performance numbers before dropping
the RFC tag. So it may still be a bit before I can pick up the kernel text piece
again.