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From: Pasha Tatashin <pasha.tatashin@soleen.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morris <jmorris@namei.org>, Sasha Levin <sashal@kernel.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	kexec mailing list <kexec@lists.infradead.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Jonathan Corbet <corbet@lwn.net>, Will Deacon <will@kernel.org>,
	Linux ARM <linux-arm-kernel@lists.infradead.org>,
	Marc Zyngier <maz@kernel.org>, James Morse <james.morse@arm.com>,
	Vladimir Murzin <vladimir.murzin@arm.com>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	linux-mm <linux-mm@kvack.org>,
	Mark Rutland <mark.rutland@arm.com>,
	steve.capper@arm.com, rfontana@redhat.com,
	Thomas Gleixner <tglx@linutronix.de>,
	Selin Dag <selindag@gmail.com>,
	Tyler Hicks <tyhicks@linux.microsoft.com>,
	Pingfan Liu <kernelfans@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	madvenka@linux.microsoft.com
Subject: Re: [PATCH v16 00/15] arm64: MMU enabled kexec relocation
Date: Thu, 16 Sep 2021 18:32:14 -0400	[thread overview]
Message-ID: <CA+CK2bB-BV2tzeq8M_B+5M9YRJX-GmT-9ZM0fnvrfnuWhSk46g@mail.gmail.com> (raw)
In-Reply-To: <YUMQZGLQl+82fL6G@arm.com>

> > In case we are so low on memory that trans_pgd_create_copy() fails to
> > allocate the linear map that uses the large pages (the size of the
> > page table is tiny) the kexec fails during kexec load time (not during
> > reboot time), as out of memory. The MMU enabled kexec reboot is always
> > on, and we should not have several ways to do kexec reboot as it makes
> > the kexec reboot unpredictable in terms of performance, and also prone
> > to bugs by having a common MMU enabled path and less common path when
> > we are low on memory which is never tested.
>
> I think this makes sense, especially since it will fail during the kexec
> load time rather than reboot.
>
> I'm ok in principle with this series but I'd need to convince James
> Morse to have a another look since he followed it more closely than me.
> Could you please rebase it against 5.15-rc1?

Sure, I will send it out soon.

Thanks,
Pasha

  reply	other threads:[~2021-09-16 22:32 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-02 21:53 Pavel Tatashin
2021-08-02 21:53 ` [PATCH v16 01/15] arm64: kernel: add helper for booted at EL2 and not VHE Pavel Tatashin
2021-08-02 21:53 ` [PATCH v16 02/15] arm64: trans_pgd: hibernate: Add trans_pgd_copy_el2_vectors Pavel Tatashin
2021-08-02 21:53 ` [PATCH v16 03/15] arm64: hibernate: abstract ttrb0 setup function Pavel Tatashin
2021-08-02 21:53 ` [PATCH v16 04/15] arm64: kexec: flush image and lists during kexec load time Pavel Tatashin
2021-08-02 21:53 ` [PATCH v16 05/15] arm64: kexec: skip relocation code for inplace kexec Pavel Tatashin
2021-08-02 21:53 ` [PATCH v16 06/15] arm64: kexec: Use dcache ops macros instead of open-coding Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 07/15] arm64: kexec: pass kimage as the only argument to relocation function Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 08/15] arm64: kexec: configure EL2 vectors for kexec Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 09/15] arm64: kexec: relocate in EL1 mode Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 10/15] arm64: kexec: use ld script for relocation function Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 11/15] arm64: kexec: install a copy of the linear-map Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 12/15] arm64: kexec: keep MMU enabled during kexec relocation Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 13/15] arm64: kexec: remove the pre-kexec PoC maintenance Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 14/15] arm64: kexec: remove cpu-reset.h Pavel Tatashin
2021-08-02 21:54 ` [PATCH v16 15/15] arm64: trans_pgd: remove trans_pgd_map_page() Pavel Tatashin
2021-08-24 18:05 ` [PATCH v16 00/15] arm64: MMU enabled kexec relocation Catalin Marinas
2021-08-26 15:03   ` Pavel Tatashin
2021-09-16  9:37     ` Catalin Marinas
2021-09-16 22:32       ` Pasha Tatashin [this message]
2021-09-08  8:59 ` Pingfan Liu

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