linux-kernel - Re: [PATCH 19/31] x86/mm/pae: Populate valid user PGD entries

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Date:   Wed, 14 Feb 2018 11:00:15 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Juergen Gross <jgross@...e.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        "H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Brian Gerst <brgerst@...il.com>,
        David Laight <David.Laight@...lab.com>,
        Denys Vlasenko <dvlasenk@...hat.com>,
        Eduardo Valentin <eduval@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Will Deacon <will.deacon@....com>, aliguori@...zon.com,
        daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
        Andrea Arcangeli <aarcange@...hat.com>,
        Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
        jroedel@...e.de
Subject: Re: [PATCH 19/31] x86/mm/pae: Populate valid user PGD entries

Hi Juergen,

On Wed, Feb 14, 2018 at 10:45:53AM +0100, Juergen Gross wrote:
> On 09/02/18 10:25, Joerg Roedel wrote:
> > +#ifdef CONFIG_X86_PAE
> > +
> > +/*
> > + * PHYSICAL_PAGE_MASK might be non-constant when SME is compiled in, so we can't
> > + * use it here.
> > + */
> > +#define PGD_PAE_PHYS_MASK	(((1ULL << __PHYSICAL_MASK_SHIFT)-1) & PAGE_MASK)
> 
> I think PAGE_MASK is a 32 bit value here, so you are chopping off
> the high physical address bits.
> 
> With that corrected the kernel is coming up as Xen PV guest.

Cool, thanks for testing these patches and debugging the breakage on
Xen-PV. I'll fix that in the next version.


Thanks again,

       Joerg