linux-kernel - Re: [PATCH RESEND 0/3] Add restrictions for kexec/kdump jumping between 5-level and 4-level kernel

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Message-ID: <20190125120527.3n6pqt5zzvczkct6@kshutemo-mobl1>
Date:   Fri, 25 Jan 2019 15:05:27 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...nel.org,
        bp@...en8.de, hpa@...or.com, kirill.shutemov@...ux.intel.com,
        dyoung@...hat.com, x86@...nel.org, kexec@...ts.infradead.org
Subject: Re: [PATCH RESEND 0/3] Add restrictions for kexec/kdump jumping
 between 5-level and 4-level kernel

On Fri, Jan 25, 2019 at 10:28:14AM +0800, Baoquan He wrote:
> This is a RESEND post.
> 
> The original v1 post can be found here:
> http://lkml.kernel.org/r/20180829141624.13985-1-bhe@redhat.com
> 
> It's trying to fix several corner case issues for kexec/kdump when
> dynamic switching of paging mode is enabled in x86_64. Please click 
> above link to check the details.
> 
> In v1, hpa raised concern that why the paging mode checking is not done
> before kexec jumping, the discussion can be found here:
> 
> http://lkml.kernel.org/r/alpine.DEB.2.21.1809051002020.1416@nanos.tec.linutronix.de
> 
> As tglx said, it might be not doable for kdump since kdump kernel's
> reserved crashkernel region only owns a portion of memory, may
> be above 4G; and might be not safer to do paging mode checking and
> switching thing after crash.
> 
> So resend this patchset.

Changes look good to me:

Acked-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>

-- 
 Kirill A. Shutemov