linux-kernel - Re: [PATCH v8] KVM: PPC: reserve a capability and ioctl numbers for realmode VFIO

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Date:	Tue, 27 Aug 2013 13:58:32 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	David Gibson <david@...son.dropbear.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>, kvm@...r.kernel.org,
	Alexander Graf <agraf@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8] KVM: PPC: reserve a capability and ioctl numbers for
 realmode VFIO

On Tue, Aug 27, 2013 at 06:42:18PM +1000, Alexey Kardashevskiy wrote:
> On 08/27/2013 05:56 PM, Gleb Natapov wrote:
> > On Thu, Aug 15, 2013 at 05:49:26PM +1000, Alexey Kardashevskiy wrote:
> >> This is to reserve a capablity number for upcoming support
> >> of VFIO-IOMMU DMA operations in real mode.
> >>
> >> The last ioctl in the group which KVM_CREATE_SPAPR_TCE_IOMMU is added to
> >> is 0xac, the next two numbers are taken - 0xad for KVM_KVMCLOCK_CTRL and
> > 0xac was also taken by KVM_SET_ONE_REG :(
> > 
> >> 0xae for KVM_ARM_VCPU_INIT. So the KVM_CREATE_SPAPR_TCE_IOMMU ioclt gets
> >> 0xaf.
> >>
> >> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> >>
> >> ---
> >> Changes:
> >> 2013/08/15 v8:
> >> * fixed comment again
> >>
> >> 2013/08/15:
> >> * fixed mistype in comments
> >> * fixed commit message which says what uses ioctls 0xad and 0xae
> >>
> >> 2013/07/16:
> >> * changed the number
> >>
> >> 2013/07/11:
> >> * changed order in a file, added comment about a gap in ioctl number
> >> ---
> >>  include/uapi/linux/kvm.h | 6 ++++++
> >>  1 file changed, 6 insertions(+)
> >>
> >> diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
> >> index 99c2533..bd94127 100644
> >> --- a/include/uapi/linux/kvm.h
> >> +++ b/include/uapi/linux/kvm.h
> >> @@ -668,6 +668,7 @@ struct kvm_ppc_smmu_info {
> >>  #define KVM_CAP_IRQ_XICS 92
> >>  #define KVM_CAP_ARM_EL1_32BIT 93
> >>  #define KVM_CAP_SPAPR_MULTITCE 94
> >> +#define KVM_CAP_SPAPR_TCE_IOMMU 95
> >>  
> >>  #ifdef KVM_CAP_IRQ_ROUTING
> >>  
> >> @@ -933,6 +934,11 @@ struct kvm_s390_ucas_mapping {
> >>  #define KVM_ARM_SET_DEVICE_ADDR	  _IOW(KVMIO,  0xab, struct kvm_arm_device_addr)
> >>  /* Available with KVM_CAP_PPC_RTAS */
> >>  #define KVM_PPC_RTAS_DEFINE_TOKEN _IOW(KVMIO,  0xac, struct kvm_rtas_token_args)
> >> +/* 0xad is taken by KVM_KVMCLOCK_CTRL */
> >> +/* 0xae is taken by KVM_ARM_VCPU_INIT */
> >> +/* Available with KVM_CAP_SPAPR_TCE_IOMMU */
> >> +#define KVM_CREATE_SPAPR_TCE_IOMMU _IOW(KVMIO,  0xaf, \
> >> +					struct kvm_create_spapr_tce_iommu)
> >>  
> > Why not use KVM_CREATE_DEVICE API for that?
> 
> 
> Because when I came up with my ioctl first time, it was not in upstream and
> since then nobody pointed me to this new ioctl :)
Sorry about that :(. The ioctl exists for a while now, but with v8 patch I
imaging your patch series predates it.

> So my stuff is not going to upstream again. Heh. Ok. I'll implement it.
> 
Thanks! Should I keep KVM_CAP_SPAPR_MULTITCE capability patch or can I
drop it for now?

--
			Gleb.
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