From: "Liu, Yi L" <yi.l.liu@intel.com>
To: Auger Eric <eric.auger@redhat.com>,
"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
"baolu.lu@linux.intel.com" <baolu.lu@linux.intel.com>,
"joro@8bytes.org" <joro@8bytes.org>
Cc: "jean-philippe@linaro.org" <jean-philippe@linaro.org>,
"Tian, Kevin" <kevin.tian@intel.com>,
"Raj, Ashok" <ashok.raj@intel.com>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"stefanha@gmail.com" <stefanha@gmail.com>,
"Tian, Jun J" <jun.j.tian@intel.com>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"Sun, Yi Y" <yi.y.sun@intel.com>, "Wu, Hao" <hao.wu@intel.com>
Subject: RE: [PATCH v6 11/15] vfio/type1: Allow invalidating first-level/stage IOMMU cache
Date: Mon, 17 Aug 2020 06:30:55 +0000 [thread overview]
Message-ID: <DM5PR11MB14352249DD871385C7811782C35F0@DM5PR11MB1435.namprd11.prod.outlook.com> (raw)
In-Reply-To: <f0c7cfc1-ee6b-c98e-77bd-1af3dbaf2a6f@redhat.com>
Hi Eric,
> From: Auger Eric <eric.auger@redhat.com>
> Sent: Sunday, August 16, 2020 7:35 PM
>
> Hi Yi,
>
> On 7/28/20 8:27 AM, Liu Yi L wrote:
> > This patch provides an interface allowing the userspace to invalidate
> > IOMMU cache for first-level page table. It is required when the first
> > level IOMMU page table is not managed by the host kernel in the nested
> > translation setup.
> >
> > Cc: Kevin Tian <kevin.tian@intel.com>
> > CC: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > Cc: Alex Williamson <alex.williamson@redhat.com>
> > Cc: Eric Auger <eric.auger@redhat.com>
> > Cc: Jean-Philippe Brucker <jean-philippe@linaro.org>
> > Cc: Joerg Roedel <joro@8bytes.org>
> > Cc: Lu Baolu <baolu.lu@linux.intel.com>
> > Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
> > Signed-off-by: Eric Auger <eric.auger@redhat.com>
> > Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
> > ---
> > v1 -> v2:
> > *) rename from "vfio/type1: Flush stage-1 IOMMU cache for nesting type"
> > *) rename vfio_cache_inv_fn() to vfio_dev_cache_invalidate_fn()
> > *) vfio_dev_cache_inv_fn() always successful
> > *) remove VFIO_IOMMU_CACHE_INVALIDATE, and reuse
> VFIO_IOMMU_NESTING_OP
> > ---
> > drivers/vfio/vfio_iommu_type1.c | 42
> +++++++++++++++++++++++++++++++++++++++++
> > include/uapi/linux/vfio.h | 3 +++
> > 2 files changed, 45 insertions(+)
> >
> > diff --git a/drivers/vfio/vfio_iommu_type1.c
> > b/drivers/vfio/vfio_iommu_type1.c index 245436e..bf95a0f 100644
> > --- a/drivers/vfio/vfio_iommu_type1.c
> > +++ b/drivers/vfio/vfio_iommu_type1.c
> > @@ -3056,6 +3056,45 @@ static long vfio_iommu_handle_pgtbl_op(struct
> vfio_iommu *iommu,
> > return ret;
> > }
> >
> > +static int vfio_dev_cache_invalidate_fn(struct device *dev, void
> > +*data) {
> > + struct domain_capsule *dc = (struct domain_capsule *)data;
> > + unsigned long arg = *(unsigned long *)dc->data;
> > +
> > + iommu_uapi_cache_invalidate(dc->domain, dev, (void __user *)arg);
> > + return 0;
> > +}
> > +
> > +static long vfio_iommu_invalidate_cache(struct vfio_iommu *iommu,
> > + unsigned long arg)
> > +{
> > + struct domain_capsule dc = { .data = &arg };
> > + struct iommu_nesting_info *info;
> > + int ret;
> > +
> > + mutex_lock(&iommu->lock);
> > + /*
> > + * Cache invalidation is required for any nesting IOMMU,
> So why do we expose the IOMMU_NESTING_FEAT_CACHE_INVLD capability? :-)
it's a stale comment. should be removed. :-)
> > + * so no need to check system-wide PASID support.
> > + */
> > + info = iommu->nesting_info;
> > + if (!info || !(info->features & IOMMU_NESTING_FEAT_CACHE_INVLD)) {
> > + ret = -EOPNOTSUPP;
> > + goto out_unlock;
> > + }
> > +
> > + ret = vfio_get_nesting_domain_capsule(iommu, &dc);
> > + if (ret)
> > + goto out_unlock;
> > +
> > + iommu_group_for_each_dev(dc.group->iommu_group, &dc,
> > + vfio_dev_cache_invalidate_fn);
> > +
> > +out_unlock:
> > + mutex_unlock(&iommu->lock);
> > + return ret;
> > +}
> > +
> > static long vfio_iommu_type1_nesting_op(struct vfio_iommu *iommu,
> > unsigned long arg)
> > {
> > @@ -3078,6 +3117,9 @@ static long vfio_iommu_type1_nesting_op(struct
> vfio_iommu *iommu,
> > case VFIO_IOMMU_NESTING_OP_UNBIND_PGTBL:
> > ret = vfio_iommu_handle_pgtbl_op(iommu, false, arg + minsz);
> > break;
> > + case VFIO_IOMMU_NESTING_OP_CACHE_INVLD:
> > + ret = vfio_iommu_invalidate_cache(iommu, arg + minsz);
> > + break;
> > default:
> > ret = -EINVAL;
> > }
> > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> > index 9501cfb..48e2fb5 100644
> > --- a/include/uapi/linux/vfio.h
> > +++ b/include/uapi/linux/vfio.h
> > @@ -1225,6 +1225,8 @@ struct vfio_iommu_type1_pasid_request {
> > * +-----------------+-----------------------------------------------+
> > * | UNBIND_PGTBL | struct iommu_gpasid_bind_data |
> > *
> > +-----------------+-----------------------------------------------+
> > + * | CACHE_INVLD | struct iommu_cache_invalidate_info |
> > + *
> > + +-----------------+-----------------------------------------------+
> > *
> > * returns: 0 on success, -errno on failure.
> > */
> > @@ -1237,6 +1239,7 @@ struct vfio_iommu_type1_nesting_op {
> >
> > #define VFIO_IOMMU_NESTING_OP_BIND_PGTBL (0)
> > #define VFIO_IOMMU_NESTING_OP_UNBIND_PGTBL (1)
> > +#define VFIO_IOMMU_NESTING_OP_CACHE_INVLD (2)
> According to my previous comment, you may refine VFIO_NESTING_OP_MASK too
yes, I've noticed it. also replied in patch 10/15.
Regards,
Yi Liu
> Thanks
>
> Eric
> >
> > #define VFIO_IOMMU_NESTING_OP _IO(VFIO_TYPE, VFIO_BASE + 19)
> >
> >
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-08-17 6:31 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-28 6:27 [PATCH v6 00/15] vfio: expose virtual Shared Virtual Addressing to VMs Liu Yi L
2020-07-28 6:27 ` [PATCH v6 01/15] vfio/type1: Refactor vfio_iommu_type1_ioctl() Liu Yi L
2020-07-28 15:53 ` Alex Williamson
2020-07-29 2:20 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 02/15] iommu: Report domain nesting info Liu Yi L
2020-08-13 12:52 ` Auger Eric
2020-08-14 7:15 ` Liu, Yi L
2020-08-16 12:40 ` Auger Eric
2020-08-18 4:21 ` Jacob Pan
2020-08-18 6:59 ` Auger Eric
2020-07-28 6:27 ` [PATCH v6 03/15] iommu/smmu: Report empty " Liu Yi L
2020-07-28 6:27 ` [PATCH v6 04/15] vfio/type1: Report iommu nesting info to userspace Liu Yi L
2020-08-13 13:19 ` Auger Eric
2020-08-14 7:36 ` Liu, Yi L
2020-08-20 19:52 ` Alex Williamson
2020-08-21 0:52 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 05/15] vfio: Add PASID allocation/free support Liu Yi L
2020-08-13 15:07 ` Auger Eric
2020-08-14 7:40 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 06/15] iommu/vt-d: Support setting ioasid set to domain Liu Yi L
2020-08-13 15:06 ` Auger Eric
2020-08-14 8:04 ` Liu, Yi L
2020-08-16 12:42 ` Auger Eric
2020-07-28 6:27 ` [PATCH v6 07/15] vfio/type1: Add VFIO_IOMMU_PASID_REQUEST (alloc/free) Liu Yi L
2020-08-15 16:30 ` Auger Eric
2020-08-17 5:23 ` Liu, Yi L
2020-08-20 20:51 ` Alex Williamson
2020-08-21 0:37 ` Liu, Yi L
2020-08-21 1:49 ` Alex Williamson
2020-08-21 2:18 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 08/15] iommu: Pass domain to sva_unbind_gpasid() Liu Yi L
2020-08-20 21:06 ` Alex Williamson
2020-08-21 0:18 ` Liu, Yi L
2020-08-21 13:09 ` Auger Eric
2020-07-28 6:27 ` [PATCH v6 09/15] iommu/vt-d: Check ownership for PASIDs from user-space Liu Yi L
2020-08-15 16:30 ` Auger Eric
2020-08-17 5:38 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 10/15] vfio/type1: Support binding guest page tables to PASID Liu Yi L
2020-08-16 11:29 ` Auger Eric
2020-08-17 6:30 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 11/15] vfio/type1: Allow invalidating first-level/stage IOMMU cache Liu Yi L
2020-08-16 11:35 ` Auger Eric
2020-08-17 6:30 ` Liu, Yi L [this message]
2020-07-28 6:27 ` [PATCH v6 12/15] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu Yi L
2020-08-20 21:48 ` Alex Williamson
2020-08-21 0:53 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 13/15] vfio/pci: Expose PCIe PASID capability to guest Liu Yi L
2020-07-28 6:27 ` [PATCH v6 14/15] vfio: Document dual stage control Liu Yi L
2020-08-16 11:51 ` Auger Eric
2020-08-17 7:00 ` Liu, Yi L
2020-08-17 7:40 ` Eric Auger
2020-08-17 7:43 ` Liu, Yi L
2020-07-28 6:27 ` [PATCH v6 15/15] iommu/vt-d: Support reporting nesting capability info Liu Yi L
2020-08-16 12:01 ` Auger Eric
2020-08-17 7:05 ` Liu, Yi L
2020-08-17 7:42 ` Auger Eric
2020-08-17 7:45 ` Liu, Yi L
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=DM5PR11MB14352249DD871385C7811782C35F0@DM5PR11MB1435.namprd11.prod.outlook.com \
--to=yi.l.liu@intel.com \
--cc=alex.williamson@redhat.com \
--cc=ashok.raj@intel.com \
--cc=baolu.lu@linux.intel.com \
--cc=eric.auger@redhat.com \
--cc=hao.wu@intel.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jean-philippe@linaro.org \
--cc=joro@8bytes.org \
--cc=jun.j.tian@intel.com \
--cc=kevin.tian@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=stefanha@gmail.com \
--cc=yi.y.sun@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).