linux-kernel - Re: [PATCH] x86/xen: enable early use of set

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Message-ID: <alpine.DEB.2.21.1808201514100.1551@nanos.tec.linutronix.de>
Date:   Mon, 20 Aug 2018 15:18:06 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Juergen Gross <jgross@...e.com>
cc:     linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        x86@...nel.org, boris.ostrovsky@...cle.com, hpa@...or.com,
        mingo@...hat.com, pasha.tatashin@...cle.com
Subject: Re: [PATCH] x86/xen: enable early use of set_fixmap in 32-bit Xen
 PV guest

On Fri, 17 Aug 2018, Juergen Gross wrote:

> Commit 7b25b9cb0dad83 ("x86/xen/time: Initialize pv xen time in
> init_hypervisor_platform()") moved the mapping of the shared info area
> before pagetable_init(). This breaks booting as 32-bit PV guest as the
> use of set_fixmap isn't possible at this time on 32-bit.
> 
> This can be worked around by populating the needed PMD on 32-bit
> kernel earlier.
> 
> In order not to reimplement populate_extra_pte() using extend_brk()
> for allocating new page tables extend alloc_low_pages() to do that in
> case the early page table pool is not yet available.
> 
> Fixes: 7b25b9cb0dad83

  ^^^ That's missing the subject text

Other than that:

Reviewd-by: Thomas Gleixner <tglx@...utronix.de>