From: Alex Williamson <alex.williamson@redhat.com>
To: Liu Yi L <yi.l.liu@intel.com>
Cc: jean-philippe@linaro.org, kevin.tian@intel.com,
ashok.raj@intel.com, kvm@vger.kernel.org,
iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org,
yi.y.sun@intel.com, hao.wu@intel.com, jun.j.tian@intel.com
Subject: Re: [PATCH v2 02/15] iommu: Report domain nesting info
Date: Thu, 11 Jun 2020 13:30:15 -0600 [thread overview]
Message-ID: <20200611133015.1418097f@x1.home> (raw)
In-Reply-To: <1591877734-66527-3-git-send-email-yi.l.liu@intel.com>
On Thu, 11 Jun 2020 05:15:21 -0700
Liu Yi L <yi.l.liu@intel.com> wrote:
> IOMMUs that support nesting translation needs report the capability info
> to userspace, e.g. the format of first level/stage paging structures.
>
> 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: Jacob Pan <jacob.jun.pan@linux.intel.com>
> ---
> @Jean, Eric: as nesting was introduced for ARM, but looks like no actual
> user of it. right? So I'm wondering if we can reuse DOMAIN_ATTR_NESTING
> to retrieve nesting info? how about your opinions?
>
> include/linux/iommu.h | 1 +
> include/uapi/linux/iommu.h | 34 ++++++++++++++++++++++++++++++++++
> 2 files changed, 35 insertions(+)
>
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 78a26ae..f6e4b49 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -126,6 +126,7 @@ enum iommu_attr {
> DOMAIN_ATTR_FSL_PAMUV1,
> DOMAIN_ATTR_NESTING, /* two stages of translation */
> DOMAIN_ATTR_DMA_USE_FLUSH_QUEUE,
> + DOMAIN_ATTR_NESTING_INFO,
> DOMAIN_ATTR_MAX,
> };
>
> diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h
> index 303f148..02eac73 100644
> --- a/include/uapi/linux/iommu.h
> +++ b/include/uapi/linux/iommu.h
> @@ -332,4 +332,38 @@ struct iommu_gpasid_bind_data {
> };
> };
>
> +struct iommu_nesting_info {
> + __u32 size;
> + __u32 format;
> + __u32 features;
> +#define IOMMU_NESTING_FEAT_SYSWIDE_PASID (1 << 0)
> +#define IOMMU_NESTING_FEAT_BIND_PGTBL (1 << 1)
> +#define IOMMU_NESTING_FEAT_CACHE_INVLD (1 << 2)
> + __u32 flags;
> + __u8 data[];
> +};
> +
> +/*
> + * @flags: VT-d specific flags. Currently reserved for future
> + * extension.
> + * @addr_width: The output addr width of first level/stage translation
> + * @pasid_bits: Maximum supported PASID bits, 0 represents no PASID
> + * support.
> + * @cap_reg: Describe basic capabilities as defined in VT-d capability
> + * register.
> + * @cap_mask: Mark valid capability bits in @cap_reg.
> + * @ecap_reg: Describe the extended capabilities as defined in VT-d
> + * extended capability register.
> + * @ecap_mask: Mark the valid capability bits in @ecap_reg.
Please explain this a little further, why do we need to tell userspace
about cap/ecap register bits that aren't valid through this interface?
Thanks,
Alex
> + */
> +struct iommu_nesting_info_vtd {
> + __u32 flags;
> + __u16 addr_width;
> + __u16 pasid_bits;
> + __u64 cap_reg;
> + __u64 cap_mask;
> + __u64 ecap_reg;
> + __u64 ecap_mask;
> +};
> +
> #endif /* _UAPI_IOMMU_H */
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu
next prev parent reply other threads:[~2020-06-11 19:30 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-11 12:15 [PATCH v2 00/15] vfio: expose virtual Shared Virtual Addressing to VMs Liu Yi L
2020-06-11 12:15 ` [PATCH v2 01/15] vfio/type1: Refactor vfio_iommu_type1_ioctl() Liu Yi L
2020-06-11 12:15 ` [PATCH v2 02/15] iommu: Report domain nesting info Liu Yi L
2020-06-11 19:30 ` Alex Williamson [this message]
2020-06-12 9:05 ` Liu, Yi L
2020-06-15 1:22 ` Tian, Kevin
2020-06-15 6:04 ` Liu, Yi L
2020-06-16 1:56 ` Tian, Kevin
2020-06-16 2:24 ` Liu, Yi L
2020-06-17 14:39 ` Jean-Philippe Brucker
2020-06-18 11:46 ` Liu, Yi L
2020-06-11 12:15 ` [PATCH v2 03/15] vfio/type1: Report iommu nesting info to userspace Liu Yi L
2020-06-11 12:15 ` [PATCH v2 04/15] vfio: Add PASID allocation/free support Liu Yi L
2020-06-11 12:15 ` [PATCH v2 05/15] iommu/vt-d: Support setting ioasid set to domain Liu Yi L
2020-06-11 12:15 ` [PATCH v2 06/15] vfio/type1: Add VFIO_IOMMU_PASID_REQUEST (alloc/free) Liu Yi L
2020-06-11 12:15 ` [PATCH v2 07/15] iommu/uapi: Add iommu_gpasid_unbind_data Liu Yi L
2020-06-11 12:15 ` [PATCH v2 08/15] iommu: Pass domain and unbind_data to sva_unbind_gpasid() Liu Yi L
2020-06-11 12:15 ` [PATCH v2 09/15] iommu/vt-d: Check ownership for PASIDs from user-space Liu Yi L
2020-06-11 12:15 ` [PATCH v2 10/15] vfio/type1: Support binding guest page tables to PASID Liu Yi L
2020-06-11 12:15 ` [PATCH v2 11/15] vfio/type1: Allow invalidating first-level/stage IOMMU cache Liu Yi L
2020-06-11 12:15 ` [PATCH v2 12/15] vfio/type1: Add vSVA support for IOMMU-backed mdevs Liu Yi L
2020-06-11 12:15 ` [PATCH v2 13/15] vfio/pci: Expose PCIe PASID capability to guest Liu Yi L
2020-06-11 12:15 ` [PATCH v2 14/15] vfio: Document dual stage control Liu Yi L
2020-06-15 9:41 ` Stefan Hajnoczi
2020-06-17 6:27 ` Liu, Yi L
2020-06-22 12:51 ` Stefan Hajnoczi
2020-06-23 6:43 ` Liu, Yi L
2020-06-11 12:15 ` [PATCH v2 15/15] iommu/vt-d: Support reporting nesting capability info Liu Yi L
2020-06-15 10:02 ` [PATCH v2 00/15] vfio: expose virtual Shared Virtual Addressing to VMs Stefan Hajnoczi
2020-06-15 12:39 ` Liu, Yi L
2020-06-16 15:34 ` Stefan Hajnoczi
2020-06-16 2:26 ` Tian, Kevin
2020-06-16 15:49 ` Stefan Hajnoczi
2020-06-16 16:09 ` Peter Xu
2020-06-22 12:49 ` Stefan Hajnoczi
2020-06-16 17:00 ` Raj, Ashok
2020-06-22 12:49 ` Stefan Hajnoczi
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=20200611133015.1418097f@x1.home \
--to=alex.williamson@redhat.com \
--cc=ashok.raj@intel.com \
--cc=hao.wu@intel.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jean-philippe@linaro.org \
--cc=jun.j.tian@intel.com \
--cc=kevin.tian@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=yi.l.liu@intel.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).