linux-kernel - Re: [PATCH v4.1] arm64: hw_breakpoint: Allow EL2 breakpoints if running in HYP

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Message-ID: <20160219143045.GJ27062@arm.com>
Date:	Fri, 19 Feb 2016 14:30:45 +0000
From:	Will Deacon <will.deacon@....com>
To:	Marc Zyngier <marc.zyngier@....com>
Cc:	Catalin Marinas <catalin.marinas@....com>,
	Mark Rutland <mark.rutland@....com>,
	Christoffer Dall <christoffer.dall@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, kvmarm@...ts.cs.columbia.edu
Subject: Re: [PATCH v4.1] arm64: hw_breakpoint: Allow EL2 breakpoints if
 running in HYP

On Wed, Feb 17, 2016 at 05:58:43PM +0000, Marc Zyngier wrote:
> With VHE, we place kernel {watch,break}-points at EL2 to get things
> like kgdb and "perf -e mem:..." working.
> 
> This requires a bit of repainting in the low-level encore/decode,
> but is otherwise pretty simple.
> 
> Signed-off-by: Marc Zyngier <marc.zyngier@....com>
> ---
>  arch/arm64/include/asm/hw_breakpoint.h | 18 +++++++++++++-----
>  1 file changed, 13 insertions(+), 5 deletions(-)

Acked-by: Will Deacon <will.deacon@....com>

Will