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From: Mike Rapoport <rppt@kernel.org>
To: Michal Hocko <mhocko@suse.com>
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>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Christopher Lameter <cl@linux.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	David Hildenbrand <david@redhat.com>,
	Elena Reshetova <elena.reshetova@intel.com>,
	"H. Peter Anvin" <hpa@zytor.com>, Ingo Molnar <mingo@redhat.com>,
	James Bottomley <jejb@linux.ibm.com>,
	"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>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Paul Walmsley <paul.walmsley@sifive.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Rick Edgecombe <rick.p.edgecombe@intel.com>,
	Roman Gushchin <guro@fb.com>, Shakeel Butt <shakeelb@google.com>,
	Shuah Khan <shuah@kernel.org>,
	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,
	linux-arm-kernel@lists.infradead.org,
	linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	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
Date: Mon, 8 Feb 2021 23:28:51 +0200	[thread overview]
Message-ID: <20210208212851.GY242749@kernel.org> (raw)
In-Reply-To: <YCEP/bmqm0DsvCYN@dhcp22.suse.cz>

On Mon, Feb 08, 2021 at 11:18:37AM +0100, Michal Hocko wrote:
> 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?

As David already said, hibernation does not care about mlocked memory, so
this feature requires a special handling.

-- 
Sincerely yours,
Mike.


  parent reply	other threads:[~2021-02-08 21:29 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-08  8:49 [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 01/10] mm: add definition of PMD_PAGE_ORDER Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 02/10] mmap: make mlock_future_check() global Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 03/10] riscv/Kconfig: make direct map manipulation options depend on MMU Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 04/10] set_memory: allow set_direct_map_*_noflush() for multiple pages Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 05/10] set_memory: allow querying whether set_direct_map_*() is actually enabled Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 06/10] arm64: kfence: fix header inclusion Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 07/10] mm: introduce memfd_secret system call to create "secret" memory areas Mike Rapoport
2021-02-08 10:49   ` Michal Hocko
2021-02-08 21:26     ` Mike Rapoport
2021-02-09  8:47       ` Michal Hocko
2021-02-09  9:09         ` Mike Rapoport
2021-02-09 13:17           ` Michal Hocko
2021-02-11  7:13             ` Mike Rapoport
2021-02-11  8:39               ` Michal Hocko
2021-02-11  9:01                 ` David Hildenbrand
2021-02-11  9:38                   ` Michal Hocko
2021-02-11  9:48                     ` David Hildenbrand
2021-02-11 10:02                     ` David Hildenbrand
2021-02-11 11:29                       ` Mike Rapoport
2021-02-11 11:27                   ` Mike Rapoport
2021-02-11 12:07                     ` David Hildenbrand
2021-02-11 23:09                       ` Mike Rapoport
2021-02-12  9:18                         ` David Hildenbrand
2021-02-14  9:19                           ` Mike Rapoport
2021-02-14  9:58                             ` David Hildenbrand
2021-02-14 19:21                               ` James Bottomley
2021-02-15  9:13                                 ` Michal Hocko
2021-02-15 18:14                                   ` James Bottomley
2021-02-15 19:20                                     ` Michal Hocko
2021-02-16 16:25                                       ` James Bottomley
2021-02-16 16:34                                         ` David Hildenbrand
2021-02-16 16:44                                           ` James Bottomley
2021-02-16 17:16                                             ` David Hildenbrand
2021-02-17 16:19                                               ` James Bottomley
2021-02-22  9:38                                                 ` David Hildenbrand
2021-02-22 10:50                                                   ` David Hildenbrand
2021-02-16 16:51                                         ` Michal Hocko
2021-02-11 11:20                 ` Mike Rapoport
2021-02-11 12:30                   ` Michal Hocko
2021-02-11 22:59                     ` Mike Rapoport
2021-02-12  9:02                       ` Michal Hocko
2021-02-08  8:49 ` [PATCH v17 08/10] PM: hibernate: disable when there are active secretmem users Mike Rapoport
2021-02-08 10:18   ` Michal Hocko
2021-02-08 10:32     ` David Hildenbrand
2021-02-08 10:51       ` Michal Hocko
2021-02-08 10:53         ` David Hildenbrand
2021-02-08 10:57           ` Michal Hocko
2021-02-08 11:13             ` David Hildenbrand
2021-02-08 11:14               ` David Hildenbrand
2021-02-08 11:26                 ` David Hildenbrand
2021-02-08 12:17                   ` Michal Hocko
2021-02-08 13:34                     ` Michal Hocko
2021-02-08 13:40                     ` David Hildenbrand
2021-02-08 21:28     ` Mike Rapoport [this message]
2021-02-22  7:34   ` Matthew Garrett
2021-02-22 10:23     ` Mike Rapoport
2021-02-22 18:27       ` Matthew Garrett
2021-02-22 19:17       ` Dan Williams
2021-02-22 19:21         ` James Bottomley
2021-02-08  8:49 ` [PATCH v17 09/10] arch, mm: wire up memfd_secret system call where relevant Mike Rapoport
2021-02-08  8:49 ` [PATCH v17 10/10] secretmem: test: add basic selftest for memfd_secret(2) Mike Rapoport
2021-02-08  9:27 ` [PATCH v17 00/10] mm: introduce memfd_secret system call to create "secret" memory areas David Hildenbrand
2021-02-08 21:13   ` Mike Rapoport
2021-02-08 21:38     ` David Hildenbrand
2021-02-09  8:59       ` Michal Hocko
2021-02-09  9:15         ` David Hildenbrand
2021-02-09  9:53           ` Michal Hocko
2021-02-09 10:23             ` David Hildenbrand
2021-02-09 10:30               ` David Hildenbrand
2021-02-09 13:25               ` Michal Hocko
2021-02-09 16:17                 ` David Hildenbrand
2021-02-09 20:08                   ` Michal Hocko

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