From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>,
<linux-kernel@vger.kernel.org>, <schwidefsky@de.ibm.com>,
<heiko.carstens@de.ibm.com>, <ebiederm@xmission.com>,
<kexec@lists.infradead.org>, <linux-s390@vger.kernel.org>,
<dyoung@redhat.com>, <0x7f454c46@gmail.com>,
Xunlei Pang <xlpang@redhat.com>
Subject: Re: [PATCH] kexec: unmap reserved pages for each error-return way
Date: Thu, 28 Jan 2016 11:32:17 +0100 [thread overview]
Message-ID: <20160128113217.79d37ff5@holzheu> (raw)
In-Reply-To: <20160127111546.2212f191f5f313b613f6b60b@linux-foundation.org>
On Wed, 27 Jan 2016 11:15:46 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:
> On Wed, 27 Jan 2016 14:48:31 +0300 Dmitry Safonov <dsafonov@virtuozzo.com> wrote:
>
> > For allocation of kimage failure or kexec_prepare or load segments
> > errors there is no need to keep crashkernel memory mapped.
> > It will affect only s390 as map/unmap hook defined only for it.
> > As on unmap s390 also changes os_info structure let's check return code
> > and add info only on success.
> >
>
> This conflicts (both mechanically and somewhat conceptually) with
> Xunlei Pang's "kexec: Introduce a protection mechanism for the
> crashkernel reserved memory" and "kexec: provide
> arch_kexec_protect(unprotect)_crashkres()".
>
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory.patch
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory-v4.patch
>
> and
>
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres.patch
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
Hmm, It looks to me that arch_kexec_(un)protect_crashkres() has exactly
the same semantics as crash_(un)map_reserved_pages().
On s390 we don't have the crashkernel memory mapped and therefore need
crash_map_reserved_pages() before loading something into crashkernel
memory.
Perhaps I missed something?
Michael
WARNING: multiple messages have this Message-ID (diff)
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Dmitry Safonov <dsafonov@virtuozzo.com>,
linux-kernel@vger.kernel.org, schwidefsky@de.ibm.com,
heiko.carstens@de.ibm.com, ebiederm@xmission.com,
kexec@lists.infradead.org, linux-s390@vger.kernel.org,
dyoung@redhat.com, 0x7f454c46@gmail.com,
Xunlei Pang <xlpang@redhat.com>
Subject: Re: [PATCH] kexec: unmap reserved pages for each error-return way
Date: Thu, 28 Jan 2016 11:32:17 +0100 [thread overview]
Message-ID: <20160128113217.79d37ff5@holzheu> (raw)
In-Reply-To: <20160127111546.2212f191f5f313b613f6b60b@linux-foundation.org>
On Wed, 27 Jan 2016 11:15:46 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:
> On Wed, 27 Jan 2016 14:48:31 +0300 Dmitry Safonov <dsafonov@virtuozzo.com> wrote:
>
> > For allocation of kimage failure or kexec_prepare or load segments
> > errors there is no need to keep crashkernel memory mapped.
> > It will affect only s390 as map/unmap hook defined only for it.
> > As on unmap s390 also changes os_info structure let's check return code
> > and add info only on success.
> >
>
> This conflicts (both mechanically and somewhat conceptually) with
> Xunlei Pang's "kexec: Introduce a protection mechanism for the
> crashkernel reserved memory" and "kexec: provide
> arch_kexec_protect(unprotect)_crashkres()".
>
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory.patch
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory-v4.patch
>
> and
>
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres.patch
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
Hmm, It looks to me that arch_kexec_(un)protect_crashkres() has exactly
the same semantics as crash_(un)map_reserved_pages().
On s390 we don't have the crashkernel memory mapped and therefore need
crash_map_reserved_pages() before loading something into crashkernel
memory.
Perhaps I missed something?
Michael
WARNING: multiple messages have this Message-ID (diff)
From: Michael Holzheu <holzheu@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-s390@vger.kernel.org,
Dmitry Safonov <dsafonov@virtuozzo.com>,
heiko.carstens@de.ibm.com, linux-kernel@vger.kernel.org,
ebiederm@xmission.com, 0x7f454c46@gmail.com,
schwidefsky@de.ibm.com, dyoung@redhat.com,
kexec@lists.infradead.org, Xunlei Pang <xlpang@redhat.com>
Subject: Re: [PATCH] kexec: unmap reserved pages for each error-return way
Date: Thu, 28 Jan 2016 11:32:17 +0100 [thread overview]
Message-ID: <20160128113217.79d37ff5@holzheu> (raw)
In-Reply-To: <20160127111546.2212f191f5f313b613f6b60b@linux-foundation.org>
On Wed, 27 Jan 2016 11:15:46 -0800
Andrew Morton <akpm@linux-foundation.org> wrote:
> On Wed, 27 Jan 2016 14:48:31 +0300 Dmitry Safonov <dsafonov@virtuozzo.com> wrote:
>
> > For allocation of kimage failure or kexec_prepare or load segments
> > errors there is no need to keep crashkernel memory mapped.
> > It will affect only s390 as map/unmap hook defined only for it.
> > As on unmap s390 also changes os_info structure let's check return code
> > and add info only on success.
> >
>
> This conflicts (both mechanically and somewhat conceptually) with
> Xunlei Pang's "kexec: Introduce a protection mechanism for the
> crashkernel reserved memory" and "kexec: provide
> arch_kexec_protect(unprotect)_crashkres()".
>
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory.patch
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory-v4.patch
>
> and
>
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres.patch
> http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
Hmm, It looks to me that arch_kexec_(un)protect_crashkres() has exactly
the same semantics as crash_(un)map_reserved_pages().
On s390 we don't have the crashkernel memory mapped and therefore need
crash_map_reserved_pages() before loading something into crashkernel
memory.
Perhaps I missed something?
Michael
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kexec mailing list
kexec@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/kexec
next prev parent reply other threads:[~2016-01-28 10:32 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-27 11:48 [PATCH] kexec: unmap reserved pages for each error-return way Dmitry Safonov
2016-01-27 11:48 ` Dmitry Safonov
2016-01-27 11:48 ` Dmitry Safonov
2016-01-27 19:15 ` Andrew Morton
2016-01-27 19:15 ` Andrew Morton
2016-01-27 19:15 ` Andrew Morton
2016-01-28 10:32 ` Michael Holzheu [this message]
2016-01-28 10:32 ` Michael Holzheu
2016-01-28 10:32 ` Michael Holzheu
2016-01-28 11:56 ` Xunlei Pang
2016-01-28 11:56 ` Xunlei Pang
2016-01-28 12:44 ` Michael Holzheu
2016-01-28 12:44 ` Michael Holzheu
2016-01-28 13:12 ` Xunlei Pang
2016-01-28 13:12 ` Xunlei Pang
2016-01-28 14:01 ` Michael Holzheu
2016-01-28 14:01 ` Michael Holzheu
[not found] ` <56A983F3.5010506@redhat.com>
[not found] ` <56A9D927.70402@virtuozzo.com>
2016-01-29 3:14 ` Xunlei Pang
2016-01-29 3:14 ` Xunlei Pang
2016-01-28 3:36 ` Xunlei Pang
2016-01-28 3:36 ` Xunlei Pang
2016-01-28 6:29 ` Minfei Huang
2016-01-28 6:29 ` Minfei Huang
2016-01-28 8:57 ` Dmitry Safonov
2016-01-28 8:57 ` Dmitry Safonov
2016-01-28 8:57 ` Dmitry Safonov
2016-02-02 5:45 ` Andrew Morton
2016-02-02 5:45 ` Andrew Morton
2016-02-02 5:45 ` Andrew Morton
2016-02-02 13:56 ` Minfei Huang
2016-02-02 13:56 ` Minfei Huang
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