linux-kernel - Re: [PATCH v10 01/11] x86/paravirt: Move halt paravirt calls under CONFIG

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Date:   Fri, 15 Oct 2021 18:59:08 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Juergen Gross <jgross@...e.com>, Deep Shah <sdeep@...are.com>,
        VMware Inc <pv-drivers@...are.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>
Cc:     Peter H Anvin <hpa@...or.com>, Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 01/11] x86/paravirt: Move halt paravirt calls under
 CONFIG_PARAVIRT

On 09.10.21 07:37, Kuppuswamy Sathyanarayanan wrote:
> From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> 
> CONFIG_PARAVIRT_XXL is mainly defined/used by XEN PV guests. For
> other VM guest types, features supported under CONFIG_PARAVIRT
> are self sufficient. CONFIG_PARAVIRT mainly provides support for
> TLB flush operations and time related operations.
> 
> For TDX guest as well, paravirt calls under CONFIG_PARVIRT meets
> most of its requirement except the need of HLT and SAFE_HLT
> paravirt calls, which is currently defined under
> COFNIG_PARAVIRT_XXL.
> 
> Since enabling CONFIG_PARAVIRT_XXL is too bloated for TDX guest
> like platforms, move HLT and SAFE_HLT paravirt calls under
> CONFIG_PARAVIRT.
> 
> Moving HLT and SAFE_HLT paravirt calls are not fatal and should not
> break any functionality for current users of CONFIG_PARAVIRT.
> 
> Co-developed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@...ux.intel.com>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Reviewed-by: Andi Kleen <ak@...ux.intel.com>
> Reviewed-by: Tony Luck <tony.luck@...el.com>
> ---
> 

Reviewed-by: David Hildenbrand <david@...hat.com>


-- 
Thanks,

David / dhildenb