From: peter.maydell@linaro.org (Peter Maydell)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 1/2] ARM: kvm: define PAGE_S2_DEVICE as read-only by default
Date: Mon, 15 Sep 2014 12:45:46 -0700 [thread overview]
Message-ID: <CAFEAcA9kZve_TRxi_5wjTZ34hG586G4gwV-TaW06K10NLZZvOw@mail.gmail.com> (raw)
In-Reply-To: <541740FF.2080105@samsung.com>
On 15 September 2014 12:41, Mario Smarduch <m.smarduch@samsung.com> wrote:
> I've been working around the edges of this discussion, and
> maybe be little unclear on this.
>
> But the manuals say intersection of Stage1/Stage2 permissions are
> used. If guest sets stage1 to read-only then setting stage 2
> to read-only or read-write should have no impact. So why
> should stage 2 RW be changed?
Read versus read-write isn't relevant. The point is
that you mustn't let the guest set up a Normal memory
mapping of the same bit of hardware (phys. address
space) that some other guest or the host has set up
as Device mapping.
-- PMM
next prev parent reply other threads:[~2014-09-15 19:45 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-13 10:17 [PATCH 1/2] ARM: kvm: define PAGE_S2_DEVICE as read-only by default Ard Biesheuvel
2014-09-13 10:17 ` [PATCH 2/2] arm64: " Ard Biesheuvel
2014-09-13 10:41 ` [PATCH 1/2] ARM: " Marc Zyngier
2014-09-13 11:15 ` Ard Biesheuvel
2014-09-13 17:06 ` Christoffer Dall
2014-09-14 4:49 ` Ard Biesheuvel
2014-09-14 9:09 ` Marc Zyngier
2014-09-14 9:43 ` Ard Biesheuvel
2014-09-14 22:57 ` Ard Biesheuvel
2014-09-15 3:37 ` Peter Maydell
2014-09-15 19:41 ` Mario Smarduch
2014-09-15 19:45 ` Peter Maydell [this message]
2014-09-17 19:19 ` Mario Smarduch
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