linux-kernel - Re: [Xen-devel] [PATCH] x86/mm: fix dump

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Message-ID: <e0f82927-919b-e93b-c07f-bfe4d5b85fe9@xen.org>
Date:   Fri, 21 Feb 2020 10:51:28 +0000
From:   Julien Grall <julien@....org>
To:     Juergen Gross <jgross@...e.com>, xen-devel@...ts.xenproject.org,
        x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Xen-devel] [PATCH] x86/mm: fix dump_pagetables with Xen PV

Hi Juergen,

On 21/02/2020 10:38, Juergen Gross wrote:
> Commit 2ae27137b2db89 ("x86: mm: convert dump_pagetables to use
> walk_page_range") broke Xen PV guests as the hypervisor reserved hole
> in the memory map was not taken into account.
> 
> Fix that by starting the kernel range only at GUARD_HOLE_END_ADDR.
> 
> Fixes: 2ae27137b2db89 ("x86: mm: convert dump_pagetables to use walk_page_range")
> Reported-by: Julien Grall <julien@....org>
> Signed-off-by: Juergen Gross <jgross@...e.com>

I can confirm the crash has now disappeared:

Tested-by: Julien Grall <julien@....org>

Cheers,

-- 
Julien Grall