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Subject: Re: [PATCH 03/10] arm64: KVM: Save/restore the host SPE state when
 entering/leaving a VM
To: Will Deacon <will.deacon@arm.com>
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 <20170202181800.GM13839@arm.com>
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From: Marc Zyngier <marc.zyngier@arm.com>
Organization: ARM Ltd
Message-ID: <266dbbc5-ae77-a28d-6fd7-cd4ac18b9606@arm.com>
Date: Thu, 2 Feb 2017 18:21:50 +0000
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On 02/02/17 18:18, Will Deacon wrote:
> On Wed, Feb 01, 2017 at 04:29:50PM +0000, Marc Zyngier wrote:
>> On 27/01/17 18:07, Will Deacon wrote:
>>> The SPE buffer is virtually addressed, using the page tables of the CPU
>>> MMU. Unusually, this means that the EL0/1 page table may be live whilst
>>> we're executing at EL2 on non-VHE configurations. When VHE is in use,
>>> we can use the same property to profile the guest behind its back.
>>>
>>> This patch adds the relevant disabling and flushing code to KVM so that
>>> the host can make use of SPE without corrupting guest memory, and any
>>> attempts by a guest to use SPE will result in a trap.
>>>
>>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>>> Cc: Alex Bennée <alex.bennee@linaro.org>
>>> Cc: Christoffer Dall <christoffer.dall@linaro.org>
>>> Signed-off-by: Will Deacon <will.deacon@arm.com>
>>> ---
>>>  arch/arm64/include/asm/kvm_arm.h  |  3 ++
>>>  arch/arm64/include/asm/kvm_host.h |  7 ++++-
>>>  arch/arm64/kvm/debug.c            |  6 ++++
>>>  arch/arm64/kvm/hyp/debug-sr.c     | 66 +++++++++++++++++++++++++++++++++++++--
>>>  arch/arm64/kvm/hyp/switch.c       | 17 +++++++++-
>>>  5 files changed, 95 insertions(+), 4 deletions(-)
> 
> [...]
> 
>> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> 
> Thanks! Given that this patch depends on an earlier one in the series
> (already queued via arm64) and the rest of the series depends on this
> patch, do you mind if I take this via arm64 for 4.11? It applies cleanly
> against current -next.

Sure, that's fine by me. I don't foresee anything clashing with this
patch that we may queue for 4.11.

Thanks,

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