From: Marc Zyngier <marc.zyngier@arm.com>
To: Dave Martin <Dave.Martin@arm.com>, kvmarm@lists.cs.columbia.edu
Cc: Geoff Levand <geoff@infradead.org>, linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] arm64: KVM: Obey RES0/1 reserved bits when setting CPTR_EL2
Date: Tue, 19 Jan 2016 16:32:43 +0000 [thread overview]
Message-ID: <569E652B.8040202@arm.com> (raw)
In-Reply-To: <1453220418-24744-1-git-send-email-Dave.Martin@arm.com>
On 19/01/16 16:20, Dave Martin wrote:
> Some bits in CPTR are defined as RES1 in the architecture. Setting
> these bits to zero may unintentionally enable future architecture
> extensions, allowing guests to use them without supervision by the host.
>
> This would be bad: for forwards compatibility, this patch makes
> sure the affected bits are always written with 1, not 0.
>
> This patch only addresses CPTR_EL2. Initialisation of other system
> registers may still need review.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Thanks for putting this together:
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Unless someone has an objection, I plan to queue this post -rc1.
M.
--
Jazz is not dead. It just smells funny...
WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] arm64: KVM: Obey RES0/1 reserved bits when setting CPTR_EL2
Date: Tue, 19 Jan 2016 16:32:43 +0000 [thread overview]
Message-ID: <569E652B.8040202@arm.com> (raw)
In-Reply-To: <1453220418-24744-1-git-send-email-Dave.Martin@arm.com>
On 19/01/16 16:20, Dave Martin wrote:
> Some bits in CPTR are defined as RES1 in the architecture. Setting
> these bits to zero may unintentionally enable future architecture
> extensions, allowing guests to use them without supervision by the host.
>
> This would be bad: for forwards compatibility, this patch makes
> sure the affected bits are always written with 1, not 0.
>
> This patch only addresses CPTR_EL2. Initialisation of other system
> registers may still need review.
>
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Thanks for putting this together:
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Unless someone has an objection, I plan to queue this post -rc1.
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2016-01-19 16:28 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-19 16:20 [PATCH] arm64: KVM: Obey RES0/1 reserved bits when setting CPTR_EL2 Dave Martin
2016-01-19 16:20 ` Dave Martin
2016-01-19 16:32 ` Marc Zyngier [this message]
2016-01-19 16:32 ` Marc Zyngier
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