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From: mark.rutland@arm.com (Mark Rutland)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/3] KVM: arm64: Access CNTHCTL_EL2 bit fields correctly on VHE systems
Date: Fri, 13 Jan 2017 14:55:45 +0000	[thread overview]
Message-ID: <20170113145545.GD2472@leverpostej> (raw)
In-Reply-To: <20170113144204.GB2472@leverpostej>

On Fri, Jan 13, 2017 at 02:42:04PM +0000, Mark Rutland wrote:
> On Fri, Jan 13, 2017 at 01:30:29PM +0000, Marc Zyngier wrote:
> > On 13/01/17 12:36, Christoffer Dall wrote:
> > > Further, are we guaranteed that the static branch gets compiled into
> > > something that doesn't actually look at cpu_hwcap_keys, which is not
> > > mapped in hyp mode?
> 
> If I disable CONFIG_JUMP_LABEL (which lives under "General setup", with
> teh title "Optimize very unlikely/likely branches"), I see adrp; add;
> ldr sequences accessing cpu_hwcap_keys when using cpus_have_const_cap()
> in hyp code, even with the patch below.

Looking again, that's the same sequence Marc mentioned, as it falls in
the BSS. I just happened to be looking at the unlinked .o file rather
than the vmlinux.

Sorry for the noise.

Thanks,
Mark.

  reply	other threads:[~2017-01-13 14:55 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-13 11:31 [PATCH 0/3] KVM/ARM updates for 4.10-rc4 Marc Zyngier
2017-01-13 11:31 ` [PATCH 1/3] KVM: arm/arm64: Fix occasional warning from the timer work function Marc Zyngier
2017-01-13 11:31 ` [PATCH 2/3] KVM: arm64: Access CNTHCTL_EL2 bit fields correctly on VHE systems Marc Zyngier
2017-01-13 12:36   ` Christoffer Dall
2017-01-13 13:30     ` Marc Zyngier
2017-01-13 13:46       ` Christoffer Dall
2017-01-13 13:57         ` Marc Zyngier
2017-01-13 14:14           ` Christoffer Dall
2017-01-13 14:42       ` Mark Rutland
2017-01-13 14:55         ` Mark Rutland [this message]
2017-01-13 14:56       ` Suzuki K Poulose
2017-01-13 19:04         ` Jintack Lim
2017-01-16 13:30         ` Marc Zyngier
2017-01-16 14:11           ` Marc Zyngier
2017-01-16 14:19             ` Suzuki K Poulose
2017-01-13 14:46     ` Mark Rutland
2017-01-13 14:57       ` Marc Zyngier
2017-01-13 11:31 ` [PATCH 3/3] KVM: arm/arm64: vgic: Fix deadlock on error handling Marc Zyngier
2017-01-17 16:49 ` [PATCH 0/3] KVM/ARM updates for 4.10-rc4 Radim Krčmář

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