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

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Date:	Thu, 11 Jul 2013 22:56:17 +1000
From:	Alexey Kardashevskiy <aik@...abs.ru>
To:	Alexander Graf <agraf@...e.de>
CC:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	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 10:51 PM, Alexander Graf wrote:
> 
> On 11.07.2013, at 14:39, Benjamin Herrenschmidt wrote:
> 
>> On Thu, 2013-07-11 at 13:15 +0200, Alexander Graf wrote:
>>> And that's bad. Jeez, seriously. Don't argue this case. We enable new
>>> features individually unless we're 100% sure we can keep everything
>>> working. In this case an ENABLE_CAP doesn't hurt at all, because user
>>> space still needs to handle the hypercalls if it wants them anyways.
>>> But you get debugging for free for example.
>>
>> An ENABLE_CAP is utterly pointless. More bloat. But you seem to like
>> it :-)
> 

> 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.


No, it would not give m anithing. My ugly debug was to disable realmode
only and still leave virtual mode on, not to disable both real and virtual
modes. It is a lot easier to disable in kernel handling in QEMU.



-- 
Alexey
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