linux-kernel - Re: [RFC Part2 PATCH v3 15/26] KVM: SVM: Add support for SEV LAUNCH

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Date:   Wed, 13 Sep 2017 23:02:59 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Joerg Roedel <joro@...tes.org>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        \"Radim Krčmář\" <rkrcmar@...hat.com>,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [RFC Part2 PATCH v3 15/26] KVM: SVM: Add support for SEV
 LAUNCH_START command

On Wed, Sep 13, 2017 at 01:58:31PM -0500, Brijesh Singh wrote:
> Actually reversed fields are not exposed in userspace structure.

Ok.

> The current approach is -- while handling the command we copy the value
> from userspace structure into FW compatible structure and also populate
> missing fields which are not known to userspace (e.g firmware handle,
> VM ASID, use system physical addresses etc).

Yap, that makes sense. All I'm saying is, check anything that userspace
can influence and make sure it is sensible.

Thx.

-- 
Regards/Gruss,
    Boris.

SUSE Linux GmbH, GF: Felix Imendörffer, Jane Smithard, Graham Norton, HRB 21284 (AG Nürnberg)
--