linux-kernel - Re: [RFC PATCH v2 16/32] x86: kvm: Provide support to create Guest and HV shared per-CPU variables

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Message-ID: <20170329153252.kwwyedndwnfgvzcb@pd.tnic>
Date:   Wed, 29 Mar 2017 17:32:53 +0200
From:   Borislav Petkov <bp@...e.de>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Brijesh Singh <brijesh.singh@....com>, simon.guinot@...uanux.org,
        linux-efi@...r.kernel.org, kvm@...r.kernel.org, rkrcmar@...hat.com,
        matt@...eblueprint.co.uk, linux-pci@...r.kernel.org,
        linus.walleij@...aro.org, gary.hook@....com, linux-mm@...ck.org,
        paul.gortmaker@...driver.com, hpa@...or.com, cl@...ux.com,
        dan.j.williams@...el.com, aarcange@...hat.com,
        sfr@...b.auug.org.au, andriy.shevchenko@...ux.intel.com,
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        joro@...tes.org, x86@...nel.org, peterz@...radead.org,
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Subject: Re: [RFC PATCH v2 16/32] x86: kvm: Provide support to create Guest
 and HV shared per-CPU variables

On Wed, Mar 29, 2017 at 05:21:13PM +0200, Paolo Bonzini wrote:
> The GHCB would have to be allocated much earlier, possibly even by
> firmware depending on how things will be designed.

How about a statically allocated page like we do with the early
pagetable pages in head_64.S?

> I think it's premature to consider SEV-ES requirements.

My only concern is not to have to redo a lot when SEV-ES gets enabled.
So it would be prudent to design with SEV-ES in the back of our minds.

-- 
Regards/Gruss,
    Boris.

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