linux-kernel - Re: [PATCH v2 05/10] KVM: arm: introduce kvm_arch_setup/clear

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Date:	Thu, 09 Apr 2015 15:18:03 +0100
From:	Alex Bennée <alex.bennee@...aro.org>
To:	Andrew Jones <drjones@...hat.com>
Cc:	David Hildenbrand <dahi@...ux.vnet.ibm.com>, kvm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.cs.columbia.edu,
	christoffer.dall@...aro.org, marc.zyngier@....com,
	peter.maydell@...aro.org, agraf@...e.de, pbonzini@...hat.com,
	zhichao.huang@...aro.org, jan.kiszka@...mens.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>,
	Andre Przywara <andre.przywara@....com>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 05/10] KVM: arm: introduce kvm_arch_setup/clear_debug()


Andrew Jones <drjones@...hat.com> writes:

> On Wed, Apr 01, 2015 at 06:28:55PM +0200, David Hildenbrand 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.
>> > 
>> > This also moves the conditional setting of the TDA bit from the hyp code
>> > into the C code.
>> > 
>> > Signed-off-by: Alex Bennée <alex.bennee@...aro.org>
>> > 
>> >  create mode 100644 arch/arm64/kvm/debug.c
>> > 
>> > diff --git a/arch/arm/include/asm/kvm_host.h b/arch/arm/include/asm/kvm_host.h
>> > index 41008cd..8c01c97 100644
>> > --- a/arch/arm/include/asm/kvm_host.h
>> > +++ b/arch/arm/include/asm/kvm_host.h
>> > @@ -242,5 +242,7 @@ static inline void kvm_arch_hardware_unsetup(void) {}
>> >  static inline void kvm_arch_sync_events(struct kvm *kvm) {}
>> >  static inline void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu) {}
>> >  static inline void kvm_arch_sched_in(struct kvm_vcpu *vcpu, int cpu) {}
>> > +static inline void kvm_arch_setup_debug(struct kvm_vcpu *vcpu) {}
>> > +static inline void kvm_arch_clear_debug(struct kvm_vcpu *vcpu) {}
>> 
>> Do you really want to call these functions "kvm_arch.." although they are not
>> defined for other arch and not triggered by common code?
>>
>
> Agreed. If other arches want something similar we can rename/refactor
> later. If these are arm-only functions, then we don't need the generic
> prefix, which is actually even a bit confusing.

They are arm only but I was keeping in mind the need to add guest debug
to ARMv7 at some point.

>
> drew 

-- 
Alex Bennée
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