[PATCH 0/3] arm64:msr: Add MSR driver

[Marc Zyngier]

On 2020-12-03 11:25, Rongwei Wang wrote:
>> 2020年12月3日 下午4:35，Marc Zyngier <maz at kernel.org> 写道：

[...]

>> But what does it mean to change random system registers while the 
>> kernel
>> itself is using them in parallel? All you are introducing is a bunch 
>> of
>> uncontrolled, unexpected, and possibly fatal side effects.
> This problem exists when writing to a register, but it does not exist
> when reading a register.

If you're not aware that the ARM architecture does have system registers
with read side-effects, you really shouldn't be writing this code.

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