linux-kernel - Re: [PATCH] arm32: fix flushcache syscall with device address

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Message-ID: <20200421081239.GA15439@willie-the-truck>
Date:   Tue, 21 Apr 2020 09:12:39 +0100
From:   Will Deacon <will@...nel.org>
To:     Tian Tao <tiantao6@...ilicon.com>
Cc:     catalin.marinas@....com, gregkh@...uxfoundation.org,
        info@...ux.net, allison@...utok.net, james.morse@....com,
        tglx@...utronix.de, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, jonathan.cameron@...wei.com,
        linuxarm@...wei.com
Subject: Re: [PATCH] arm32: fix flushcache syscall with device address

On Tue, Apr 21, 2020 at 04:08:34PM +0800, Tian Tao wrote:
> An issue has been observed on our Kungpeng916 systems when using a PCI
> express GPU. This occurs when a 32 bit application running on a 64 bit
> kernel issues a cache flush operation to a memory address that is in
> a PCI BAR of the GPU.The results in an illegal operation and
> subsequent crash.

A kernel crash? If so, please can you include the log here?

Will