From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Rutland <mark.rutland@arm.com>
Subject: Re: [PATCH 01/13] arm/arm64: Add new is_kernel_in_hyp_mode predicate
Date: Thu, 9 Jul 2015 10:42:30 +0100
Message-ID: <20150709094230.GA20105@leverpostej>
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To: Marc Zyngier <marc.zyngier@arm.com>
Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org>, Catalin Marinas <Catalin.Marinas@arm.com>, Will Deacon <Will.Deacon@arm.com>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>
List-Id: kvmarm@lists.cs.columbia.edu

Hi,

> +static inline bool is_kernel_in_hyp_mode(void)
> +{
> +	u64 el;
> +
> +	asm("mrs %0, CurrentEL" : "=r" (el));
> +	return el == CurrentEL_EL2;
> +}

If you can include cputype.h, I think this can be:

static inline bool is_kernel_in_hyp_mode(void)
{
	return read_cpuid(CurrentEL) == CurrentEL_EL2;
}

Mark.