linux-kernel - Re: [PATCH 01/13] arm/arm64: Add new is_kernel_in_hyp

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Date:	Thu, 9 Jul 2015 10:42:30 +0100
From:	Mark Rutland <mark.rutland@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Catalin Marinas <Catalin.Marinas@....com>,
	Will Deacon <Will.Deacon@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>
Subject: Re: [PATCH 01/13] arm/arm64: Add new is_kernel_in_hyp_mode predicate

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.
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