From: Paolo Bonzini <pbonzini@redhat.com>
To: Ard Biesheuvel <ard.biesheuvel@linaro.org>,
kvmarm@lists.cs.columbia.edu, christoffer.dall@linaro.org,
marc.zyngier@arm.com, lersek@redhat.com, drjones@redhat.com,
wei@redhat.com
Cc: kvm@vger.kernel.org
Subject: Re: [PATCH 3/3] arm, arm64: KVM: handle potential incoherency of readonly memslots
Date: Mon, 17 Nov 2014 16:29:50 +0100 [thread overview]
Message-ID: <546A146E.1020804@redhat.com> (raw)
In-Reply-To: <1416236333-9378-3-git-send-email-ard.biesheuvel@linaro.org>
On 17/11/2014 15:58, Ard Biesheuvel wrote:
> Readonly memslots are often used to implement emulation of ROMs and
> NOR flashes, in which case the guest may legally map these regions as
> uncached.
> To deal with the incoherency associated with uncached guest mappings,
> treat all readonly memslots as incoherent, and ensure that pages that
> belong to regions tagged as such are flushed to DRAM before being passed
> to the guest.
On x86, the processor combines the cacheability values from the two
levels of page tables. Is there no way to do the same on ARM?
Paolo
next prev parent reply other threads:[~2014-11-17 15:29 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-17 14:58 [PATCH 1/3] kvm: add a memslot flag for incoherent memory regions Ard Biesheuvel
2014-11-17 14:58 ` [PATCH 2/3] arm, arm64: KVM: allow forced dcache flush on page faults Ard Biesheuvel
2014-11-17 14:58 ` [PATCH 3/3] arm, arm64: KVM: handle potential incoherency of readonly memslots Ard Biesheuvel
2014-11-17 15:29 ` Paolo Bonzini [this message]
2014-11-17 15:39 ` Marc Zyngier
2014-11-17 16:03 ` Paolo Bonzini
2014-11-17 15:49 ` Laszlo Ersek
2014-11-19 23:32 ` Mario Smarduch
2014-11-20 8:08 ` Laszlo Ersek
2014-11-20 18:35 ` Mario Smarduch
2014-11-20 18:40 ` Peter Maydell
2014-11-20 19:15 ` Mario Smarduch
2014-11-20 19:49 ` Jon Masters
2014-11-20 20:10 ` Peter Maydell
2014-11-20 21:13 ` Laszlo Ersek
2014-11-20 21:59 ` Peter Maydell
2014-11-21 11:19 ` Christoffer Dall
2014-11-22 1:50 ` Mario Smarduch
2014-11-22 10:18 ` Christoffer Dall
2014-11-22 10:26 ` Laszlo Ersek
2014-11-22 12:27 ` Peter Maydell
2014-11-19 8:51 ` Ard Biesheuvel
2014-11-19 11:02 ` Paolo Bonzini
2014-11-19 11:03 ` Paolo Bonzini
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