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From:   Arnd Bergmann <arnd@arndb.de>
Date:   Sun, 21 Mar 2021 12:55:24 +0100
Message-ID: <CAK8P3a2A4d5iKZyA_Lexmfrn02ysiXuJPk9HK6ybYFgoVWuRdw@mail.gmail.com>
Subject: Re: arm64 syzbot instances
To:     Peter Maydell <peter.maydell@linaro.org>
Cc:     Dmitry Vyukov <dvyukov@google.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
        Ard Biesheuvel <ardb@kernel.org>,
        Linux ARM <linux-arm-kernel@lists.infradead.org>,
        syzkaller <syzkaller@googlegroups.com>,
        LKML <linux-kernel@vger.kernel.org>,
        John Garry <john.garry@huawei.com>,
        =?UTF-8?B?QWxleCBCZW5uw6ll?= <alex.bennee@linaro.org>
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On Sun, Mar 21, 2021 at 12:52 PM Arnd Bergmann <arnd@arndb.de> wrote:
> On Sat, Mar 20, 2021 at 9:43 PM Peter Maydell <peter.maydell@linaro.org> wrote:

> https://tldp.org/HOWTO/Plug-and-Play-HOWTO-6.html#ss6.12
> states the behavior of the ISA I/O ports and how Linux drivers rely
> on that. Is that enough for you?

Actually it only mentions it very indirectly, by saying that if a present
device has 0xFF in a register, the detection may fail since it looks like
a missing device.

         Arnd