linux-kernel - Re: [PATCH 2/7] KVM: arm: guest debug, define API headers

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Date:	Wed, 26 Nov 2014 14:58:16 +0000
From:	Alex Bennée <alex.bennee@...aro.org>
To:	Andrew Jones <drjones@...hat.com>
Cc:	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,
	Catalin Marinas <catalin.marinas@....com>,
	jan.kiszka@...mens.com, Will Deacon <will.deacon@....com>,
	open list <linux-kernel@...r.kernel.org>,
	dahi@...ux.vnet.ibm.com, r65777@...escale.com, pbonzini@...hat.com,
	bp@...e.de
Subject: Re: [PATCH 2/7] KVM: arm: guest debug, define API headers


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

> On Tue, Nov 25, 2014 at 04:10:00PM +0000, Alex Bennée wrote:
>> This commit defines the API headers for guest debugging. There are two
>> architecture specific debug structures:
<snip>
>> +/* Architecture related debug defines - upper 16 bits of
>> + * kvm_guest_debug->control
>> + */
>> +#define KVM_GUESTDBG_USE_SW_BP_SHIFT	16
>> +#define KVM_GUESTDBG_USE_SW_BP		(1 << KVM_GUESTDBG_USE_SW_BP_SHIFT)
>> +#define KVM_GUESTDBG_USE_HW_BP_SHIFT	17
>> +#define KVM_GUESTDBG_USE_HW_BP		(1 << KVM_GUESTDBG_USE_HW_BP_SHIFT)
>> +
>
> I see this are defined in arch/x86/include/uapi/asm/kvm.h,
> so you needed to reproduce them here, but shouldn't they
> be promoted to include/uapi/linux/kvm.h instead?

Well if we move them to common uapi we either restrict the $ARCH
specific options that don't have SW/HW BKPTS (would be weird but...) or
make them generic in the lower 16 bits (breaks API).

But in principle I have no objection if other don't.

-- 
Alex Bennée
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