linux-kernel - Re: [PATCH v1 01/12] x86/smp: Make start_secondary() and initial_pg

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Message-ID: <56A63F92.80500@oracle.com>
Date:	Mon, 25 Jan 2016 10:30:26 -0500
From:	Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:	David Vrabel <david.vrabel@...rix.com>, konrad.wilk@...cle.com
Cc:	xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
	roger.pau@...rix.com, mcgrof@...e.com
Subject: Re: [PATCH v1 01/12] x86/smp: Make start_secondary() and
 initial_pg_pmd visible globally

On 01/25/2016 05:53 AM, David Vrabel wrote:
> On 22/01/16 21:35, Boris Ostrovsky wrote:
>> Xen's HVMlite guests will want to use them.
> Please explain in detail why they are needed.
>

Actually, start_secondary is not needed anymore, I removed its use at 
some point.

initial_pg_pmd (together with initial_page_table) are not really 
required  --- I just used them for temporary page tables in the hvmlite 
startup code instead of allocating dedicated pages for that. Perhaps 
there is other (Xen-specific) area that I can use for that. Once we jump 
to startup_32 these tables are no longer in use.

-boris