RE: [RFC PATCH 0/5] hw/arm/virt: Add support for user-creatable nested SMMUv3

[Shameerali Kolothum Thodi via <qemu-devel@nongnu.org>]

> -----Original Message-----
> From: Nicolin Chen <nicolinc@nvidia.com>
> Sent: Thursday, January 23, 2025 4:10 AM
> To: Donald Dutile <ddutile@redhat.com>
> Cc: Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@huawei.com>; eric.auger@redhat.com; Peter
> Maydell <peter.maydell@linaro.org>; Jason Gunthorpe <jgg@nvidia.com>;
> Daniel P. Berrangé <berrange@redhat.com>; qemu-arm@nongnu.org;
> qemu-devel@nongnu.org; Linuxarm <linuxarm@huawei.com>; Wangzhou
> (B) <wangzhou1@hisilicon.com>; jiangkunkun <jiangkunkun@huawei.com>;
> Jonathan Cameron <jonathan.cameron@huawei.com>;
> zhangfei.gao@linaro.org
> Subject: Re: [RFC PATCH 0/5] hw/arm/virt: Add support for user-creatable
> nested SMMUv3
> 
> Hi Don,
> 
> On Fri, Jan 10, 2025 at 11:05:24PM -0500, Donald Dutile wrote:
> > On 1/8/25 11:45 PM, Nicolin Chen wrote:
> > > On Mon, Dec 16, 2024 at 10:01:29AM +0000, Shameerali Kolothum Thodi
> wrote:
> > > > And patches prior to this commit adds that support:
> > > > 4ccdbe3: ("cover-letter: Add HW accelerated nesting support for arm
> > > > SMMUv3")
> > > >
> > > > Nicolin is soon going to send out those for review. Or I can include
> > > > those in this series so that it gives a complete picture. Nicolin?
> > >
> > > Just found that I forgot to reply this one...sorry
> > >
> > > I asked Don/Eric to take over that vSMMU series:
> > > https://lore.kernel.org/qemu-devel/Zy0jiPItu8A3wNTL@Asurada-Nvidia/
> > > (The majority of my effort has been still on the kernel side:
> > >   previously vIOMMU/vDEVICE, and now vEVENTQ/MSI/vCMDQ..)
> > >
> > > Don/Eric, is there any update from your side?
> > >
> > Apologies for delayed response, been at customer site, and haven't been
> keeping up w/biz email.
> > Eric is probably waiting for me to get back and chat as well.
> > Will look to reply early next week.
> 
> I wonder if we can make some progress in Feb? If so, we can start
> to wrap up the iommufd uAPI patches for HWPT, which was a part of
> intel's series but never got sent since their emulated series is
> seemingly still pending?

I think these are the  5 patches that we require from Intel pass-through series,

vfio/iommufd: Implement [at|de]tach_hwpt handlers
vfio/iommufd: Implement HostIOMMUDeviceClass::realize_late() handler
HostIOMMUDevice: Introduce realize_late callback
vfio/iommufd: Add properties and handlers to TYPE_HOST_IOMMU_DEVICE_IOMMUFD
backends/iommufd: Add helpers for invalidating user-managed HWPT

See the commits from here,
https://github.com/hisilicon/qemu/commit/bbdc65af38fa5723f1bd9b026e292730901f57b5

[CC  Zhenzhong]

Hi Zhenzhong,

Just wondering what your plans are for the above patches.  If it make sense and you
are fine with it, I think it is a good idea one of us can pick up those from that series
and sent out separately so that it can get some review and take it forward.

Thanks,
Shameer