linux-kernel - Re: Linux guest kernel threat model for Confidential Computing

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Message-ID: <20230125124543-mutt-send-email-mst@kernel.org>
Date:   Wed, 25 Jan 2023 12:47:47 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        "Shishkin, Alexander" <alexander.shishkin@...el.com>,
        "Shutemov, Kirill" <kirill.shutemov@...el.com>,
        "Kuppuswamy, Sathyanarayanan" <sathyanarayanan.kuppuswamy@...el.com>,
        "Kleen, Andi" <andi.kleen@...el.com>,
        "Hansen, Dave" <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        "Wunner, Lukas" <lukas.wunner@...el.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Jason Wang <jasowang@...hat.com>,
        "Poimboe, Josh" <jpoimboe@...hat.com>,
        "aarcange@...hat.com" <aarcange@...hat.com>,
        Cfir Cohen <cfir@...gle.com>, Marc Orr <marcorr@...gle.com>,
        "jbachmann@...gle.com" <jbachmann@...gle.com>,
        "pgonda@...gle.com" <pgonda@...gle.com>,
        "keescook@...omium.org" <keescook@...omium.org>,
        James Morris <jmorris@...ei.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        "Lange, Jon" <jlange@...rosoft.com>,
        "linux-coco@...ts.linux.dev" <linux-coco@...ts.linux.dev>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux guest kernel threat model for Confidential Computing

On Wed, Jan 25, 2023 at 07:02:03PM +0300, Kirill A. Shutemov wrote:
> On Wed, Jan 25, 2023 at 10:45:48AM -0500, Michael S. Tsirkin wrote:
> > On Wed, Jan 25, 2023 at 04:16:02PM +0100, Greg Kroah-Hartman wrote:
> > > Everyone wants a subset, different from other's subset, which means you
> > > need them all.  Sorry.
> > 
> > Well if there's a very popular system (virtual in this case) that needs
> > a specific config to work well, then I guess
> > arch/x86/configs/ccguest.config or whatever might be acceptable, no?
> > Lots of precedent here.
> 
> OS vendors want the single kernel that fits all sizes: it should be
> possible (and secure) to run a generic disto kernel within TDX/SEV guest.

If they want that, sure. But it then becomes this distro's
responsibility to configure things in a sane way. At least if
there's a known good config that's a place to document what
is known to work well. No?

-- 
MST