linux-kernel - Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls

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Date:	Thu, 11 Jul 2013 23:13:04 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
CC:	Alexander Graf <agraf@...e.de>, linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	kvm-ppc@...r.kernel.org
Subject: Re: [PATCH 6/8] KVM: PPC: Add support for multiple-TCE hcalls

On 07/11/2013 10:58 PM, Benjamin Herrenschmidt wrote:
> On Thu, 2013-07-11 at 14:51 +0200, Alexander Graf wrote:
>> I don't like bloat usually. But Alexey even had an #ifdef DEBUG in
>> there to selectively disable in-kernel handling of multi-TCE. Not
>> calling ENABLE_CAP would give him exactly that without ugly #ifdefs in
>> the kernel.
> 
> I don't see much point in disabling it... but ok, if that's a valuable
> feature, then shoot some VM level ENABLE_CAP (please don't iterate all
> VCPUs, that's gross).

No use for me whatsoever as I only want to disable real more handlers and
keep virtual mode handlers enabled (sometime, for debug only) and this
capability is not about that - I can easily just not enable it in QEMU with
the exactly the same effect.

So please, fellas, decide whether I should iterate vcpu's or add ENABLE_CAP
per KVM. Thanks.


-- 
Alexey
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