linux-kernel - Re: [PATCH 0/3] arm64:msr: Add MSR driver

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Message-ID: <5e7f7225982b2df63e62ea60ec632376@misterjones.org>
Date:   Mon, 30 Nov 2020 18:05:51 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Rongwei Wang <rongwei.wang@...ux.alibaba.com>
Cc:     catalin.marinas@....com, will@...nel.org,
        bjorn.andersson@...aro.org, shawnguo@...nel.org, gshan@...hat.com,
        geert+renesas@...der.be, Anson.Huang@....com, masahiroy@...nel.org,
        michael@...le.cc, krzk@...nel.org, linux-kernel@...r.kernel.org,
        vkoul@...nel.org, olof@...om.net, vincenzo.frascino@....com,
        ardb@...nel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 0/3] arm64:msr: Add MSR driver

On 2020-11-30 17:48, Rongwei Wang wrote:

> The interfaces of this module is same as MSR module in user space, and 
> to solve
> the problem that ARM platform has no similar MSR module. Using this 
> interface,
> we did some pressure tests to test the stability and security of MSR 
> driver. The
> test results show that the driver will not cause system panic if 
> various
> illegal values and multithreading concurrent access are passed through 
> the
> interface.

It would certainly help if you described what problem you are trying
to solve here. In general, giving userspace access to random system
registers is a pretty bad idea.

Are you trying to validate a CPU? a hypervisor? Or is it just a fun way
to check how many things you can poke before something catches fire?

Thanks,

         M.
-- 
Jazz is not dead. It just smells funny...