linux-kernel - Re: [PATCH v5 05/12] KVM: arm: introduce kvm_arm_init/setup/clear

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Date:	Thu, 4 Jun 2015 13:07:40 +0200
From:	Christoffer Dall <christoffer.dall@...aro.org>
To:	Alex Bennée <alex.bennee@...aro.org>
Cc:	kvm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	kvmarm@...ts.cs.columbia.edu, marc.zyngier@....com,
	peter.maydell@...aro.org, agraf@...e.de, drjones@...hat.com,
	pbonzini@...hat.com, zhichao.huang@...aro.org,
	jan.kiszka@...mens.com, dahi@...ux.vnet.ibm.com,
	r65777@...escale.com, bp@...e.de, Gleb Natapov <gleb@...nel.org>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	Andre Przywara <andre.przywara@....com>,
	Richard Weinberger <richard@....at>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v5 05/12] KVM: arm: introduce
 kvm_arm_init/setup/clear_debug

On Fri, May 29, 2015 at 10:30:21AM +0100, Alex Bennée wrote:
> This is a precursor for later patches which will need to do more to
> setup debug state before entering the hyp.S switch code. The existing
> functionality for setting mdcr_el2 has been moved out of hyp.S and now
> uses the value kept in vcpu->arch.mdcr_el2.
> 
> As the assembler used to previously mask and preserve MDCR_EL2.HPMN I've
> had to add a mechanism to save the value of mdcr_el2 as a per-cpu
> variable during the initialisation code. The kernel never sets this
> number so we are assuming the bootcode has set up the correct value
> here.
> 
> This also moves the conditional setting of the TDA bit from the hyp code
> into the C code which is currently used for the lazy debug register
> context switch code.
> 
> Signed-off-by: Alex Bennée <alex.bennee@...aro.org>
> 
Reviewed-by: Christoffer Dall <christoffer.dall@...aro.org>
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