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List:       android-virt
Subject:    Re: [kvm-unit-tests RFC PATCH 04/16] arm/arm64: selftest: Add prefetch abort test
From:       Mark Rutland <mark.rutland () arm ! com>
Date:       2019-08-29 10:19:42
Message-ID: 20190829101942.GC44575 () lakrids ! cambridge ! arm ! com
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On Thu, Aug 29, 2019 at 09:18:35AM +0100, Alexandru Elisei wrote:
> On 8/28/19 3:09 PM, Mark Rutland wrote:
> > On Wed, Aug 28, 2019 at 02:38:19PM +0100, Alexandru Elisei wrote:
> >> +	/*
> >> +	 * AArch64 treats all regions writable at EL0 as PXN.
> > I didn't think that was the case, and I can't find wording to that
> > effect in the ARM ARM (looking at ARM DDI 0487E.a). Where is that
> > stated?
> 
> It's in ARM DDI 0487E.a, table D5-33, footnote c: "Not executable, because
> AArch64 execution treats all regions writable at EL0 as being PXN". I'll update
> the comment to include the quote.

Interesting; I was not aware of that particular behaviour. Thanks
for the pointer!

Mark.
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