From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH v6 10/11] KVM: arm64: BTI: Reset BTYPE when skipping
 emulated instructions
Date: Sat, 15 Feb 2020 11:56:24 +0000
Message-ID: <20200215115624.2afbf55c@why>
References: <20200212192906.53366-1-broonie@kernel.org>
 <20200212192906.53366-11-broonie@kernel.org>
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Cc: Paul Elliott <paul.elliott@arm.com>, Peter Zijlstra <peterz@infradead.org>, Catalin Marinas <catalin.marinas@arm.com>, Andrew Jones <drjones@redhat.com>, Amit Kachhap <amit.kachhap@arm.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Will Deacon <will@kernel.org>, linux-arch@vger.kernel.org, Eugene Syromiatnikov <esyr@redhat.com>, Szabolcs Nagy <szabolcs.nagy@arm.com>, Dave Martin <Dave.Martin@arm.com>, "H . J . Lu " <hjl.tools@gmail.com>, Yu-cheng Yu <yu-cheng.yu@intel.com>, Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>, Jann Horn <jannh@google.com>, Richard Henderson <richard.henderson@linaro.org>, Kristina =?UTF-8?Q?Mart=C5=A1enko?= <kristina.martsenko@arm.com>, Alexander Viro <viro@zeniv.linux.org.uk>, Thomas Gleixner <tglx@linutronix.de>, linux-arm-kernel@lists.infradead.org, Florian Weimer <fweimer@redhat.com>, linux-kernel@vger.kernel.orgli
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On Wed, 12 Feb 2020 19:29:05 +0000
Mark Brown <broonie@kernel.org> wrote:

> From: Dave Martin <Dave.Martin@arm.com>
> 
> Since normal execution of any non-branch instruction resets the
> PSTATE BTYPE field to 0, so do the same thing when emulating a
> trapped instruction.
> 
> Branches don't trap directly, so we should never need to assign a
> non-zero value to BTYPE here.
> 
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Signed-off-by: Mark Brown <broonie@kernel.org>

Acked-by: Marc Zyngier <maz@kernel.org>

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

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Date: Sat, 15 Feb 2020 11:56:24 +0000
From: Marc Zyngier <maz@kernel.org>
Subject: Re: [PATCH v6 10/11] KVM: arm64: BTI: Reset BTYPE when skipping
 emulated instructions
Message-ID: <20200215115624.2afbf55c@why>
In-Reply-To: <20200212192906.53366-11-broonie@kernel.org>
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        <20200212192906.53366-11-broonie@kernel.org>
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To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Alexander Viro <viro@zeniv.linux.org.uk>, Paul Elliott <paul.elliott@arm.com>, Peter Zijlstra <peterz@infradead.org>, Yu-cheng Yu <yu-cheng.yu@intel.com>, Amit Kachhap <amit.kachhap@arm.com>, Vincenzo Frascino <vincenzo.frascino@arm.com>, Eugene Syromiatnikov <esyr@redhat.com>, Szabolcs Nagy <szabolcs.nagy@arm.com>, "H . J . Lu " <hjl.tools@gmail.com>, Andrew Jones <drjones@redhat.com>, Kees Cook <keescook@chromium.org>, Arnd Bergmann <arnd@arndb.de>, Jann Horn <jannh@google.com>, Richard Henderson <richard.henderson@linaro.org>, Kristina =?UTF-8?Q?Mart=C5=A1enko?= <kristina.martsenko@arm.com>, Thomas Gleixner <tglx@linutronix.de>, Florian Weimer <fweimer@redhat.com>, Sudakshina Das <sudi.das@arm.com>, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-fsdevel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>
Message-ID: <20200215115624.y9bkbVTfkd4v0uFJdSisflzIYLa_kqfE0QBOizl6tmE@z>

On Wed, 12 Feb 2020 19:29:05 +0000
Mark Brown <broonie@kernel.org> wrote:

> From: Dave Martin <Dave.Martin@arm.com>
> 
> Since normal execution of any non-branch instruction resets the
> PSTATE BTYPE field to 0, so do the same thing when emulating a
> trapped instruction.
> 
> Branches don't trap directly, so we should never need to assign a
> non-zero value to BTYPE here.
> 
> Signed-off-by: Dave Martin <Dave.Martin@arm.com>
> Signed-off-by: Mark Brown <broonie@kernel.org>

Acked-by: Marc Zyngier <maz@kernel.org>

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