From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org,
ebiederm@xmission.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, corbet@lwn.net,
catalin.marinas@arm.com, will@kernel.org,
linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org
Subject: [RFC v1 0/4] arm64: MMU enabled kexec kernel relocation
Date: Tue, 16 Jul 2019 12:56:37 -0400 [thread overview]
Message-ID: <20190716165641.6990-1-pasha.tatashin@soleen.com> (raw)
Added identity mapped page table, and keep MMU enabled while
kernel is being relocated from sparse pages to the final
destination during kexec.
More description about the problem I am trying to solve here, can be
found here:
https://lore.kernel.org/lkml/20190709182014.16052-1-pasha.tatashin@soleen.com/
This patch series works in terms, that I can kexec-reboot both in QEMU
and on a physical machine. However, I do not see performance improvement
during relocation. The performance is just as slow as before with disabled
caches.
Am I missing something? Perhaps, there is some flag that I should also
enable in page table? Please provide me with any suggestions.
Pavel Tatashin (4):
arm64, mm: identity mapped page table
arm64, kexec: interface preparation for mmu enabled kexec
arm64, kexec: add kexec's own identity page table
arm64: Keep MMU on while kernel is being relocated
arch/arm64/include/asm/ident_map.h | 26 ++++++
arch/arm64/include/asm/kexec.h | 5 +-
arch/arm64/kernel/cpu-reset.S | 8 --
arch/arm64/kernel/cpu-reset.h | 7 +-
arch/arm64/kernel/machine_kexec.c | 128 +++++++++++++++++++++-------
arch/arm64/kernel/relocate_kernel.S | 36 +++++---
arch/arm64/mm/Makefile | 1 +
arch/arm64/mm/ident_map.c | 99 +++++++++++++++++++++
8 files changed, 255 insertions(+), 55 deletions(-)
create mode 100644 arch/arm64/include/asm/ident_map.h
create mode 100644 arch/arm64/mm/ident_map.c
--
2.22.0
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next reply other threads:[~2019-07-16 16:56 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-16 16:56 Pavel Tatashin [this message]
2019-07-16 16:56 ` [RFC v1 1/4] arm64, mm: identity mapped page table Pavel Tatashin
2019-07-16 16:56 ` [RFC v1 2/4] arm64, kexec: interface preparation for mmu enabled kexec Pavel Tatashin
2019-07-16 16:56 ` [RFC v1 3/4] arm64, kexec: add kexec's own identity page table Pavel Tatashin
2019-07-16 16:56 ` [RFC v1 4/4] arm64: Keep MMU on while kernel is being relocated Pavel Tatashin
2019-07-16 19:14 ` [RFC v1 0/4] arm64: MMU enabled kexec kernel relocation Bhupesh Sharma
2019-07-16 19:26 ` Pavel Tatashin
2019-07-17 17:51 ` James Morse
2019-07-17 19:13 ` Pavel Tatashin
2019-07-26 14:00 ` James Morse
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