linux-kernel - Re: [RFC 08/17] kvm: arm/arm64: implement kvm_arm_[halt,resume]

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Message-ID: <55967C97.5010502@arm.com>
Date:	Fri, 03 Jul 2015 13:14:15 +0100
From:	Marc Zyngier <marc.zyngier@....com>
To:	Eric Auger <eric.auger@...aro.org>,
	"eric.auger@...com" <eric.auger@...com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"alex.williamson@...hat.com" <alex.williamson@...hat.com>,
	"pbonzini@...hat.com" <pbonzini@...hat.com>,
	"avi.kivity@...il.com" <avi.kivity@...il.com>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"feng.wu@...el.com" <feng.wu@...el.com>,
	"joro@...tes.org" <joro@...tes.org>,
	"b.reynal@...tualopensystems.com" <b.reynal@...tualopensystems.com>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"patches@...aro.org" <patches@...aro.org>
Subject: Re: [RFC 08/17] kvm: arm/arm64: implement kvm_arm_[halt,resume]_guest

On 03/07/15 12:55, Eric Auger wrote:
> Christoffer, Marc,
> On 07/02/2015 03:17 PM, Eric Auger wrote:
>> On halt, the guest is forced to exit and prevented from being
>> re-entered. This is synchronous.
>>
>> Those two operations will be needed for IRQ forwarding setting.
>>
>> Signed-off-by: Eric Auger <eric.auger@...aro.org>
> would you agree to handle this ARM functionality separately from the
> forwarding series?
> 
> This includes 2 patch files, that one +
> https://lkml.org/lkml/2015/7/2/288. This functionality is needed for
> forwarding control since when changing the forwarding state we need to
> "freeze" the state of the physical/virtual IRQ to undertake proper
> actions. Stopping the guest makes sure it won't deactivate the virtual
> IRQ while we are doing state change actions.
> 
> The forwarding series is quite heterogeneous (VFIO platform driver,
> vgic, irq bypass manager) and I think it would simplify the review process.
> 
> Please let me know if you agree. If yes, I will post a separate series.

I don't mind, I trust you to do what's best for these series to be
easily reviewed (if that is at all possible).

The only thing is that this patch implements a feature that will
otherwise be unused, so annotating the functions with __maybe_unused
would avoid warnings.

Thanks,

	M.
-- 
Jazz is not dead. It just smells funny...
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