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From: Will Deacon <will.deacon@arm.com>
To: Marc Zyngier <marc.zyngier@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com,
	kim.phillips@arm.com, alex.bennee@linaro.org,
	christoffer.dall@linaro.org, tglx@linutronix.de,
	peterz@infradead.org, alexander.shishkin@linux.intel.com,
	robh@kernel.org, suzuki.poulose@arm.com, pawel.moll@arm.com,
	mathieu.poirier@linaro.org, mingo@redhat.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH 03/10] arm64: KVM: Save/restore the host SPE state when entering/leaving a VM
Date: Thu, 2 Feb 2017 18:18:00 +0000	[thread overview]
Message-ID: <20170202181800.GM13839@arm.com> (raw)
In-Reply-To: <3064a7a5-6661-fc22-c5e4-2478e8457035@arm.com>

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.

Will

  reply	other threads:[~2017-02-02 18:18 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-27 18:07 [PATCH 00/10] Add support for the ARMv8.2 Statistical Profiling Extension Will Deacon
2017-01-27 18:07 ` [PATCH 01/10] arm64: cpufeature: allow for version discrepancy in PMU implementations Will Deacon
2017-01-27 18:07 ` [PATCH 02/10] arm64: cpufeature: Don't enforce system-wide SPE capability Will Deacon
2017-01-27 18:07 ` [PATCH 03/10] arm64: KVM: Save/restore the host SPE state when entering/leaving a VM Will Deacon
2017-02-01 16:29   ` Marc Zyngier
2017-02-02 18:18     ` Will Deacon [this message]
2017-02-02 18:21       ` Marc Zyngier
2017-01-27 18:07 ` [PATCH 04/10] arm64: head.S: Enable EL1 (host) access to SPE when entered at EL2 Will Deacon
2017-02-01 16:22   ` Marc Zyngier
2017-02-09 18:26   ` Mark Rutland
2017-01-27 18:07 ` [PATCH 05/10] genirq: export irq_get_percpu_devid_partition to modules Will Deacon
2017-01-27 18:07 ` [PATCH 06/10] perf/core: Export AUX buffer helpers " Will Deacon
2017-01-27 18:07 ` [PATCH 07/10] perf: Directly pass PERF_AUX_* flags to perf_aux_output_end Will Deacon
2017-02-17 13:40   ` Alexander Shishkin
2017-02-17 14:00     ` Will Deacon
2017-02-17 14:06       ` Alexander Shishkin
2017-02-17 14:42         ` Will Deacon
2017-02-17 14:59           ` Alexander Shishkin
2017-01-27 18:07 ` [PATCH 08/10] perf/core: Add PERF_AUX_FLAG_COLLISION to report colliding samples Will Deacon
2017-03-31 16:44   ` Robin Murphy
2017-01-27 18:07 ` [PATCH 09/10] drivers/perf: Add support for ARMv8.2 Statistical Profiling Extension Will Deacon
2017-01-30 19:03   ` Kim Phillips
2017-01-27 18:07 ` [PATCH 10/10] dt-bindings: Document devicetree binding for ARM SPE Will Deacon

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