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Date: Mon, 8 Feb 2021 11:18:37 +0100
From: Michal Hocko <mhocko@suse.com>
To: Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active
 secretmem users
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 <20210208084920.2884-9-rppt@kernel.org>
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On Mon 08-02-21 10:49:18, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> It is unsafe to allow saving of secretmem areas to the hibernation
> snapshot as they would be visible after the resume and this essentially
> will defeat the purpose of secret memory mappings.
> 
> Prevent hibernation whenever there are active secret memory users.

Does this feature need any special handling? As it is effectivelly
unevictable memory then it should behave the same as other mlock, ramfs
which should already disable hibernation as those cannot be swapped out,
no?

-- 
Michal Hocko
SUSE Labs
_______________________________________________
Linux-nvdimm mailing list -- linux-nvdimm@lists.01.org
To unsubscribe send an email to linux-nvdimm-leave@lists.01.org

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Date:   Mon, 8 Feb 2021 11:18:37 +0100
From:   Michal Hocko <mhocko@suse.com>
To:     Mike Rapoport <rppt@kernel.org>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
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        David Hildenbrand <david@redhat.com>,
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        "H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
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        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
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        Thomas Gleixner <tglx@linutronix.de>,
        Tycho Andersen <tycho@tycho.ws>, Will Deacon <will@kernel.org>,
        linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
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        linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org,
        x86@kernel.org, Hagen Paul Pfeifer <hagen@jauu.net>,
        Palmer Dabbelt <palmerdabbelt@google.com>
Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active
 secretmem users
Message-ID: <YCEP/bmqm0DsvCYN@dhcp22.suse.cz>
References: <20210208084920.2884-1-rppt@kernel.org>
 <20210208084920.2884-9-rppt@kernel.org>
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On Mon 08-02-21 10:49:18, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> It is unsafe to allow saving of secretmem areas to the hibernation
> snapshot as they would be visible after the resume and this essentially
> will defeat the purpose of secret memory mappings.
> 
> Prevent hibernation whenever there are active secret memory users.

Does this feature need any special handling? As it is effectivelly
unevictable memory then it should behave the same as other mlock, ramfs
which should already disable hibernation as those cannot be swapped out,
no?

-- 
Michal Hocko
SUSE Labs

From mboxrd@z Thu Jan  1 00:00:00 1970
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Date: Mon, 8 Feb 2021 11:18:37 +0100
From: Michal Hocko <mhocko@suse.com>
To: Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active
 secretmem users
Message-ID: <YCEP/bmqm0DsvCYN@dhcp22.suse.cz>
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On Mon 08-02-21 10:49:18, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> It is unsafe to allow saving of secretmem areas to the hibernation
> snapshot as they would be visible after the resume and this essentially
> will defeat the purpose of secret memory mappings.
> 
> Prevent hibernation whenever there are active secret memory users.

Does this feature need any special handling? As it is effectivelly
unevictable memory then it should behave the same as other mlock, ramfs
which should already disable hibernation as those cannot be swapped out,
no?

-- 
Michal Hocko
SUSE Labs

_______________________________________________
linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv

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Date: Mon, 8 Feb 2021 11:18:37 +0100
From: Michal Hocko <mhocko@suse.com>
To: Mike Rapoport <rppt@kernel.org>
Subject: Re: [PATCH v17 08/10] PM: hibernate: disable when there are active
 secretmem users
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Cc: Mark Rutland <mark.rutland@arm.com>, David Hildenbrand <david@redhat.com>,
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On Mon 08-02-21 10:49:18, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@linux.ibm.com>
> 
> It is unsafe to allow saving of secretmem areas to the hibernation
> snapshot as they would be visible after the resume and this essentially
> will defeat the purpose of secret memory mappings.
> 
> Prevent hibernation whenever there are active secret memory users.

Does this feature need any special handling? As it is effectivelly
unevictable memory then it should behave the same as other mlock, ramfs
which should already disable hibernation as those cannot be swapped out,
no?

-- 
Michal Hocko
SUSE Labs

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