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Mon, 06 Jul 2020 05:34:35 -0400 X-MC-Unique: Zdh8rqKPNx-qOLPflH5qHg-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 69532107ACF3; Mon, 6 Jul 2020 09:34:33 +0000 (UTC) Received: from [10.36.113.241] (ovpn-113-241.ams2.redhat.com [10.36.113.241]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 766BF5D9D7; Mon, 6 Jul 2020 09:34:24 +0000 (UTC) Subject: Re: [PATCH v4 02/15] iommu: Report domain nesting info To: Liu Yi L , alex.williamson@redhat.com, baolu.lu@linux.intel.com, joro@8bytes.org References: <1593861989-35920-1-git-send-email-yi.l.liu@intel.com> <1593861989-35920-3-git-send-email-yi.l.liu@intel.com> From: Auger Eric Message-ID: Date: Mon, 6 Jul 2020 11:34:22 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <1593861989-35920-3-git-send-email-yi.l.liu@intel.com> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 Cc: jean-philippe@linaro.org, kevin.tian@intel.com, ashok.raj@intel.com, kvm@vger.kernel.org, stefanha@gmail.com, jun.j.tian@intel.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, yi.y.sun@intel.com, hao.wu@intel.com X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 7/4/20 1:26 PM, Liu Yi L wrote: > IOMMUs that support nesting translation needs report the capability info need to report > to userspace, e.g. the format of first level/stage paging structures. > > This patch reports nesting info by DOMAIN_ATTR_NESTING. Caller can get > nesting info after setting DOMAIN_ATTR_NESTING. > > Cc: Kevin Tian > CC: Jacob Pan > Cc: Alex Williamson > Cc: Eric Auger > Cc: Jean-Philippe Brucker > Cc: Joerg Roedel > Cc: Lu Baolu > Signed-off-by: Liu Yi L > Signed-off-by: Jacob Pan > --- > v3 -> v4: > *) split the SMMU driver changes to be a separate patch > *) move the @addr_width and @pasid_bits from vendor specific > part to generic part. > *) tweak the description for the @features field of struct > iommu_nesting_info. > *) add description on the @data[] field of struct iommu_nesting_info > > v2 -> v3: > *) remvoe cap/ecap_mask in iommu_nesting_info. > *) reuse DOMAIN_ATTR_NESTING to get nesting info. > *) return an empty iommu_nesting_info for SMMU drivers per Jean' > suggestion. > --- > include/uapi/linux/iommu.h | 78 ++++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 78 insertions(+) > > diff --git a/include/uapi/linux/iommu.h b/include/uapi/linux/iommu.h > index 1afc661..1bfc032 100644 > --- a/include/uapi/linux/iommu.h > +++ b/include/uapi/linux/iommu.h > @@ -332,4 +332,82 @@ struct iommu_gpasid_bind_data { > } vendor; > }; > > +/* > + * struct iommu_nesting_info - Information for nesting-capable IOMMU. > + * user space should check it before using > + * nesting capability. alignment? > + * > + * @size: size of the whole structure > + * @format: PASID table entry format, the same definition with > + * @format of struct iommu_gpasid_bind_data. the same definition as struct iommu_gpasid_bind_data @format? > + * @features: supported nesting features. > + * @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. > + * @data: vendor specific cap info. data[] structure type can be deduced > + * from @format field. > + * > + * +===============+======================================================+ > + * | feature | Notes | > + * +===============+======================================================+ > + * | SYSWIDE_PASID | PASIDs are managed in system-wide, instead of per | > + * | | device. When a device is assigned to userspace or | > + * | | VM, proper uAPI (userspace driver framework uAPI, | > + * | | e.g. VFIO) must be used to allocate/free PASIDs for | > + * | | the assigned device. | > + * +---------------+------------------------------------------------------+ > + * | BIND_PGTBL | The owner of the first level/stage page table must | > + * | | explicitly bind the page table to associated PASID | > + * | | (either the one specified in bind request or the | > + * | | default PASID of iommu domain), through userspace | > + * | | driver framework uAPI (e.g. VFIO_IOMMU_NESTING_OP). | > + * +---------------+------------------------------------------------------+ > + * | CACHE_INVLD | The owner of the first level/stage page table must | > + * | | explicitly invalidate the IOMMU cache through uAPI | > + * | | provided by userspace driver framework (e.g. VFIO) | > + * | | according to vendor-specific requirement when | > + * | | changing the page table. | > + * +---------------+------------------------------------------------------+ Do you foresee cases where BIND_PGTBL and CACHE_INVLD shouldn't be exposed as features? > + * > + * @data[] types defined for @format: > + * +================================+=====================================+ > + * | @format | @data[] | > + * +================================+=====================================+ > + * | IOMMU_PASID_FORMAT_INTEL_VTD | struct iommu_nesting_info_vtd | > + * +--------------------------------+-------------------------------------+ > + * > + */ > +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) In other structs the values seem to be defined before the field > + __u32 flags; > + __u16 addr_width; > + __u16 pasid_bits; > + __u32 padding; > + __u8 data[]; > +}; > + > +/* > + * struct iommu_nesting_info_vtd - Intel VT-d specific nesting info > + * spurious line > + * > + * @flags: VT-d specific flags. Currently reserved for future > + * extension. > + * @cap_reg: Describe basic capabilities as defined in VT-d capability > + * register. > + * @ecap_reg: Describe the extended capabilities as defined in VT-d > + * extended capability register. > + */ > +struct iommu_nesting_info_vtd { > + __u32 flags; > + __u32 padding; > + __u64 cap_reg; > + __u64 ecap_reg; > +}; > + > #endif /* _UAPI_IOMMU_H */ > Thanks Eric _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu