linux-kernel - Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

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Message-ID: <1369869272.18630.47@snotra>
Date:	Wed, 29 May 2013 18:14:32 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
CC:	David Gibson <david@...son.dropbear.id.au>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <kvm-ppc@...r.kernel.org>,
	Alexander Graf <agraf@...e.de>,
	Paul Mackerras <paulus@...ba.org>,
	<linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH 3/4] KVM: PPC: Add support for IOMMU in-kernel handling

On 05/29/2013 06:10:33 PM, Alexey Kardashevskiy wrote:
> On 05/30/2013 06:05 AM, Scott Wood wrote:
> > On 05/28/2013 07:12:32 PM, Alexey Kardashevskiy wrote:
> >> On 05/29/2013 09:35 AM, Scott Wood wrote:
> >> > On 05/28/2013 06:30:40 PM, Alexey Kardashevskiy wrote:
> >> >> >> >>> @@ -939,6 +940,9 @@ struct kvm_s390_ucas_mapping {
> >> >> >> >>> #define KVM_GET_DEVICE_ATTR      _IOW(KVMIO,  0xe2,  
> struct
> >> >> >> >>> kvm_device_attr)
> >> >> >> >>> #define KVM_HAS_DEVICE_ATTR      _IOW(KVMIO,  0xe3,  
> struct
> >> >> >> >>> kvm_device_attr)
> >> >> >> >>>
> >> >> >> >>> +/* ioctl for SPAPR TCE IOMMU */
> >> >> >> >>> +#define KVM_CREATE_SPAPR_TCE_IOMMU _IOW(KVMIO,  0xe4,  
> struct
> >> >> >> >>> kvm_create_spapr_tce_iommu)
> >> >> >> >>
> >> >> >> >> Shouldn't this go under the vm ioctl section?
> >> >> >>
> >> >> >>
> >> >> >> The KVM_CREATE_SPAPR_TCE_IOMMU ioctl (the version for  
> emulated
> >> >> devices) is
> >> >> >> in this section so I decided to keep them together. Wrong?
> >> >> >
> >> >> > You decided to keep KVM_CREATE_SPAPR_TCE_IOMMU together with
> >> >> > KVM_CREATE_SPAPR_TCE_IOMMU?
> >> >>
> >> >> Yes.
> >> >
> >> > Sigh.  That's the same thing repeated.  There's only one IOCTL.
> >> Nothing is
> >> > being "kept together".
> >>
> >> Sorry, I meant this ioctl - KVM_CREATE_SPAPR_TCE.
> >
> > But you didn't put it in the same section as KVM_CREATE_SPAPR_TCE.   
> 0xe0
> > begins a different section.
> 
> It is not really obvious that there are sections as no comment defines
> those :)

There is a comment /* ioctls for fds returned by KVM_CREATE_DEVICE */

Putting KVM_CREATE_DEVICE in there was mainly to avoid dealing with the  
ioctl number conflict mess in the vm-ioctl section, but at least that  
one is related to the device control API. :-)

> But yes, makes sense to move it up a bit and change the code to 0xad.

0xad is KVM_KVMCLOCK_CTRL

-Scott
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