linux-kernel - Re: [RFC v2 8/8] arm64, kexec: enable MMU during kexec relocation

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Message-ID: <CA+CK2bCBxff=ZcCMw196idR-1uvryACdzREebqrZeJ2JPwDNFw@mail.gmail.com>
Date:   Wed, 31 Jul 2019 12:01:07 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Mark Rutland <mark.rutland@....com>
Cc:     James Morris <jmorris@...ei.org>, Sasha Levin <sashal@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        kexec mailing list <kexec@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>, will@...nel.org,
        Linux Doc Mailing List <linux-doc@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Marc Zyngier <marc.zyngier@....com>,
        James Morse <james.morse@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bhupesh Sharma <bhsharma@...hat.com>
Subject: Re: [RFC v2 8/8] arm64, kexec: enable MMU during kexec relocation

> For various reasons, one cannot safely use Set/Way operations in
> portable code. They only make sense for low-level platform-specific
> firmware performing power management operations.
>
> If you need to perform D-cache maintenance, you must use the VA
> operations to do so.

Hi Mark,

I see, thank you for letting me know. I will do d-cache flushing by VA
in the next iteration. First I need to root cause/fix the bug
described in the cover letter.

Thank you,
Pasha