linux-kernel - Re: [PATCH v11 16/20] x86/virt/tdx: Initialize all TDMRs

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Message-ID: <20230609100352.6gnn5foahnppibmm@box.shutemov.name>
Date:   Fri, 9 Jun 2023 13:03:52 +0300
From:   kirill.shutemov@...ux.intel.com
To:     Kai Huang <kai.huang@...el.com>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-mm@...ck.org, dave.hansen@...el.com, tony.luck@...el.com,
        peterz@...radead.org, tglx@...utronix.de, seanjc@...gle.com,
        pbonzini@...hat.com, david@...hat.com, dan.j.williams@...el.com,
        rafael.j.wysocki@...el.com, ying.huang@...el.com,
        reinette.chatre@...el.com, len.brown@...el.com, ak@...ux.intel.com,
        isaku.yamahata@...el.com, chao.gao@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, bagasdotme@...il.com,
        sagis@...gle.com, imammedo@...hat.com
Subject: Re: [PATCH v11 16/20] x86/virt/tdx: Initialize all TDMRs

On Mon, Jun 05, 2023 at 02:27:29AM +1200, Kai Huang wrote:
> After the global KeyID has been configured on all packages, initialize
> all TDMRs to make all TDX-usable memory regions that are passed to the
> TDX module become usable.
> 
> This is the last step of initializing the TDX module.
> 
> Initializing TDMRs can be time consuming on large memory systems as it
> involves initializing all metadata entries for all pages that can be
> used by TDX guests.  Initializing different TDMRs can be parallelized.
> For now to keep it simple, just initialize all TDMRs one by one.  It can
> be enhanced in the future.
> 
> Signed-off-by: Kai Huang <kai.huang@...el.com>
> Reviewed-by: Isaku Yamahata <isaku.yamahata@...el.com>

Reviewed-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov