linux-kernel - Re: [PATCH v2] xen,kdump: handle pv domain in paddr_vmcoreinfo

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Message-ID: <e4e8a2b8-10df-53e4-3467-d8690f5d7b14@oracle.com>
Date:   Fri, 31 Mar 2017 10:02:23 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
        xen-devel@...ts.xenproject.org
Cc:     ptesarik@...e.com
Subject: Re: [PATCH v2] xen,kdump: handle pv domain in paddr_vmcoreinfo_note()

On 03/31/2017 06:14 AM, Juergen Gross wrote:
> For kdump to work correctly it needs the physical address of
> vmcoreinfo_note. When running as dom0 this means the virtual address
> has to be translated to the related machine address.
>
> paddr_vmcoreinfo_note() is meant to do the translation via
> __pa_symbol() only, but being attributed "weak" it can be replaced
> easily in Xen case.
>
> Signed-off-by: Juergen Gross <jgross@...e.com>

Similar to Jan's concern, if bare-metal x86 people decide to have their
own paddr_vmcoreinfo_note() (and they usually build with !CONFIG_XEN) we
will have to update this again. I suppose we can deal with that if/when
it happens since we will discover this immediately.

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>