linux-kernel - Re: [PATCH RFC v7 13/64] x86/cpufeatures: Add SEV-SNP CPU feature

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Message-ID: <20230220180038.bkypwkjkzsb4xc4b@amd.com>
Date:   Mon, 20 Feb 2023 12:00:38 -0600
From:   Michael Roth <michael.roth@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     <kvm@...r.kernel.org>, <linux-coco@...ts.linux.dev>,
        <linux-mm@...ck.org>, <linux-crypto@...r.kernel.org>,
        <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <jroedel@...e.de>,
        <thomas.lendacky@....com>, <hpa@...or.com>, <ardb@...nel.org>,
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        <dave.hansen@...ux.intel.com>, <slp@...hat.com>,
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        <srinivas.pandruvada@...ux.intel.com>, <rientjes@...gle.com>,
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        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        <alpergun@...gle.com>, <dgilbert@...hat.com>, <jarkko@...nel.org>,
        <ashish.kalra@....com>, <harald@...fian.com>,
        Brijesh Singh <brijesh.singh@....com>,
        Jarkko Sakkinen <jarkko@...fian.com>
Subject: Re: [PATCH RFC v7 13/64] x86/cpufeatures: Add SEV-SNP CPU feature

On Mon, Feb 20, 2023 at 06:50:09PM +0100, Borislav Petkov wrote:
> On Mon, Feb 20, 2023 at 10:26:47AM -0600, Michael Roth wrote:
> > On Wed, Feb 01, 2023 at 07:39:32PM +0100, Borislav Petkov wrote:
> > > On Wed, Dec 14, 2022 at 01:40:05PM -0600, Michael Roth wrote:
> > > > From: Brijesh Singh <brijesh.singh@....com>
> > > > 
> > > > Add CPU feature detection for Secure Encrypted Virtualization with
> > > > Secure Nested Paging. This feature adds a strong memory integrity
> > > > protection to help prevent malicious hypervisor-based attacks like
> > > > data replay, memory re-mapping, and more.
> > > > 
> > > > Link: https://lore.kernel.org/all/YrGINaPc3cojG6%2F3@zn.tnic/
> > > 
> > > That points to some review feedback I've given - dunno if it is
> > > relevant.
> > > 
> > > > Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> > > > Signed-off-by: Jarkko Sakkinen <jarkko@...fian.com>
> > > 
> > > I read this as Jarkko has handled this patch too. Is that the case?
> > 
> > Yes we shared some patches via an internal tree at some stages.
> 
> In the sense that, he took Brijesh's patch, then he did something with
> it(?) and then Ashish took it from him and then you took it from Ashish?

Yes, I think he rebased Ashish's tree on a newer tree and added his SoB on
patches that required any conflict resolutions or changes on his end, so
we kept those intact since then.

-Mike

> 
> This is how I'm reading this SOB chain at least...
> 
> -- 
> Regards/Gruss,
>     Boris.
> 
> https://people.kernel.org/tglx/notes-about-netiquette