linux-kernel - Re: [PATCH 01/11] Initialize the mapping of KASan shadow memory

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Message-ID: <B8AC3E80E903784988AB3003E3E97330C0063816@dggemm510-mbs.china.huawei.com>
Date:   Fri, 17 Nov 2017 07:18:45 +0000
From:   "Liuwenliang (Abbott Liu)" <liuwenliang@...wei.com>
To:     Marc Zyngier <marc.zyngier@....com>
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Subject: Re: [PATCH 01/11] Initialize the mapping of KASan shadow memory

On 16/11/17  22:41 Marc Zyngier [mailto:marc.zyngier@....com] wrote:
>No, it doesn't. It cannot work, because Cortex-A9 predates the invention
>of the 64bit accessor. I suspect that you are testing stuff in QEMU,
>which is giving you a SW model that always supports LPAE. I suggest you
>test this code on *real* HW, and not only on QEMU.

I am sorry. My test is fault. I only defined TTBR0 as __ACCESS_CP15_64,
but I don't use the definition TTBR0 as __ACCESS_CP15_64. 

Now I use the definition TTBR0 as __ACCESS_CP15_64 on CPU supporting
LPAE(vexpress_a9), I find it doesn't work and report undefined instruction error
when execute "mrrc" instruction.

So, you are right that 64bit accessor of TTBR0 cannot work on LPAE.