linux-kernel - Re: [RFC v2-fix-v4 1/1] x86: Introduce generic protected guest abstraction

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Date:   Wed, 9 Jun 2021 15:53:51 -0700
From:   Sathyanarayanan Kuppuswamy Natarajan 
        <sathyanarayanan.nkuppuswamy@...il.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC v2-fix-v4 1/1] x86: Introduce generic protected guest abstraction

Hi All,

On Wed, Jun 9, 2021 at 12:42 PM Kuppuswamy Sathyanarayanan
<sathyanarayanan.kuppuswamy@...ux.intel.com> wrote:
>
> Add a generic way to check if we run with an encrypted guest,
> without requiring x86 specific ifdefs. This can then be used in
> non architecture specific code.
>
> prot_guest_has() is used to check for protected guest feature
> flags.
>
> Originally-by: Andi Kleen <ak@...ux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> ---

I have sent a non RFC version of this patch for x86 review. Please use
it for further
discussion.

https://lore.kernel.org/patchwork/patch/1444184/

> Changes since RFC v2-fix-v3:
>  * Introduced ARCH_HAS_PROTECTED_GUEST and moved arch specific checks to
>    asm/protected_guest.h
>
> Changes since RFC v2-fix-v2:
>  * Renamed protected_guest_has() to prot_guest_has().
>  * Changed flag prefix from VM_ to PR_GUEST_
>  * Merged Borislav AMD implementation fix.




-- 
Sathyanarayanan Kuppuswamy
Linux Kernel Developer