From: Lu Baolu <baolu.lu@linux.intel.com>
To: Jacob Pan <jacob.jun.pan@linux.intel.com>,
iommu@lists.linux-foundation.org,
LKML <linux-kernel@vger.kernel.org>,
Joerg Roedel <joro@8bytes.org>,
David Woodhouse <dwmw2@infradead.org>
Cc: baolu.lu@linux.intel.com, "Tian, Kevin" <kevin.tian@intel.com>,
Raj Ashok <ashok.raj@intel.com>, Yi Liu <yi.l.liu@intel.com>,
Eric Auger <eric.auger@redhat.com>,
Yi L <yi.l.liu@linux.intel.com>
Subject: Re: [PATCH v8 02/10] iommu/vt-d: Add nested translation helper function
Date: Wed, 18 Dec 2019 10:41:53 +0800 [thread overview]
Message-ID: <6192b57c-12ab-ec6c-ab95-d9b9bff3efad@linux.intel.com> (raw)
In-Reply-To: <1576524252-79116-3-git-send-email-jacob.jun.pan@linux.intel.com>
Hi again,
On 12/17/19 3:24 AM, Jacob Pan wrote:
> +/**
> + * intel_pasid_setup_nested() - Set up PASID entry for nested translation
> + * which is used for vSVA. The first level page tables are used for
> + * GVA-GPA or GIOVA-GPA translation in the guest, second level page tables
> + * are used for GPA-HPA translation.
> + *
> + * @iommu: Iommu which the device belong to
> + * @dev: Device to be set up for translation
> + * @gpgd: FLPTPTR: First Level Page translation pointer in GPA
> + * @pasid: PASID to be programmed in the device PASID table
> + * @pasid_data: Additional PASID info from the guest bind request
> + * @domain: Domain info for setting up second level page tables
> + * @addr_width: Address width of the first level (guest)
> + */
> +int intel_pasid_setup_nested(struct intel_iommu *iommu,
> + struct device *dev, pgd_t *gpgd,
> + int pasid, struct iommu_gpasid_bind_data_vtd *pasid_data,
> + struct dmar_domain *domain,
> + int addr_width)
> +{
> + struct pasid_entry *pte;
> + struct dma_pte *pgd;
> + u64 pgd_val;
> + int agaw;
> + u16 did;
> +
> + if (!ecap_nest(iommu->ecap)) {
> + pr_err("IOMMU: %s: No nested translation support\n",
> + iommu->name);
> + return -EINVAL;
> + }
> +
> + pte = intel_pasid_get_entry(dev, pasid);
> + if (WARN_ON(!pte))
> + return -EINVAL;
> +
> + pasid_clear_entry(pte);
In some cases, e.g. nested mode for GIOVA-HPA, the PASID entry might
have already been setup for second level translation. (This could be
checked with the Present bit.) Hence, it's safe to flush caches here.
Or, maybe intel_pasid_tear_down_entry() is more suitable?
Best regards,
baolu
next prev parent reply other threads:[~2019-12-18 2:42 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-16 19:24 [PATCH v8 00/10] Nested Shared Virtual Address (SVA) VT-d support Jacob Pan
2019-12-16 19:24 ` [PATCH v8 01/10] iommu/vt-d: Move domain helper to header Jacob Pan
2019-12-16 19:24 ` [PATCH v8 02/10] iommu/vt-d: Add nested translation helper function Jacob Pan
2019-12-18 2:01 ` Lu Baolu
2020-01-09 17:51 ` Jacob Pan
2019-12-18 2:41 ` Lu Baolu [this message]
2020-01-09 18:39 ` Jacob Pan
2020-01-10 1:15 ` Lu Baolu
2020-01-10 18:25 ` Jacob Pan
2019-12-16 19:24 ` [PATCH v8 03/10] iommu/vt-d: Add bind guest PASID support Jacob Pan
2019-12-18 3:14 ` Lu Baolu
2020-01-09 21:45 ` Jacob Pan
2019-12-16 19:24 ` [PATCH v8 04/10] iommu/vt-d: Support flushing more translation cache types Jacob Pan
2019-12-19 2:46 ` Lu Baolu
2020-01-09 21:50 ` Jacob Pan
2020-01-10 1:17 ` Lu Baolu
2019-12-16 19:24 ` [PATCH v8 05/10] iommu/vt-d: Add svm/sva invalidate function Jacob Pan
2019-12-16 19:24 ` [PATCH v8 06/10] iommu/vt-d: Cache virtual command capability register Jacob Pan
2019-12-18 3:25 ` Lu Baolu
2020-01-09 21:59 ` Jacob Pan
2019-12-16 19:24 ` [PATCH v8 07/10] iommu/vt-d: Enlightened PASID allocation Jacob Pan
2019-12-16 19:24 ` [PATCH v8 08/10] iommu/vt-d: Add custom allocator for IOASID Jacob Pan
2019-12-18 4:10 ` Lu Baolu
2020-01-09 22:06 ` Jacob Pan
2020-01-10 1:19 ` Lu Baolu
2019-12-16 19:24 ` [PATCH v8 09/10] iommu/ioasid: Add notifier for status change Jacob Pan
2019-12-16 19:24 ` [PATCH v8 10/10] iommu/vt-d: Handle IOASID notifications Jacob Pan
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=6192b57c-12ab-ec6c-ab95-d9b9bff3efad@linux.intel.com \
--to=baolu.lu@linux.intel.com \
--cc=ashok.raj@intel.com \
--cc=dwmw2@infradead.org \
--cc=eric.auger@redhat.com \
--cc=iommu@lists.linux-foundation.org \
--cc=jacob.jun.pan@linux.intel.com \
--cc=joro@8bytes.org \
--cc=kevin.tian@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=yi.l.liu@intel.com \
--cc=yi.l.liu@linux.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).