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Date: Thu, 9 Apr 2020 10:50:34 +0200
From: Auger Eric <eric.auger@...hat.com>
To: Jacob Pan <jacob.jun.pan@...ux.intel.com>,
Lu Baolu <baolu.lu@...ux.intel.com>,
iommu@...ts.linux-foundation.org,
LKML <linux-kernel@...r.kernel.org>,
Joerg Roedel <joro@...tes.org>,
David Woodhouse <dwmw2@...radead.org>,
Jean-Philippe Brucker <jean-philippe@...aro.com>
Cc: Yi Liu <yi.l.liu@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
Raj Ashok <ashok.raj@...el.com>,
Alex Williamson <alex.williamson@...hat.com>,
Christoph Hellwig <hch@...radead.org>,
Jonathan Cameron <jic23@...nel.org>
Subject: Re: [PATCH v11 07/10] iommu/vt-d: Add svm/sva invalidate function
Hi Jacob,
On 4/3/20 8:42 PM, Jacob Pan wrote:
> When Shared Virtual Address (SVA) is enabled for a guest OS via
> vIOMMU, we need to provide invalidation support at IOMMU API and driver
> level. This patch adds Intel VT-d specific function to implement
> iommu passdown invalidate API for shared virtual address.
>
> The use case is for supporting caching structure invalidation
> of assigned SVM capable devices. Emulated IOMMU exposes queue
> invalidation capability and passes down all descriptors from the guest
> to the physical IOMMU.
>
> The assumption is that guest to host device ID mapping should be
> resolved prior to calling IOMMU driver. Based on the device handle,
> host IOMMU driver can replace certain fields before submit to the
> invalidation queue.
>
> ---
> v11 - Removed 2D map array, use -EINVAL in granularity lookup array.
> Fixed devTLB invalidation granularity mapping. Disregard G=1 case
> and use address selective invalidation only.
>
> v7 review fixed in v10
> ---
>
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> Signed-off-by: Ashok Raj <ashok.raj@...el.com>
> Signed-off-by: Liu, Yi L <yi.l.liu@...el.com>
> ---
> drivers/iommu/intel-iommu.c | 158 ++++++++++++++++++++++++++++++++++++++++++++
> 1 file changed, 158 insertions(+)
>
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index 94c7993dac6a..045c5c08d71d 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -5594,6 +5594,163 @@ static void intel_iommu_aux_detach_device(struct iommu_domain *domain,
> aux_domain_remove_dev(to_dmar_domain(domain), dev);
> }
>
> +/*
> + * 2D array for converting and sanitizing IOMMU generic TLB granularity to
> + * VT-d granularity. Invalidation is typically included in the unmap operation
> + * as a result of DMA or VFIO unmap. However, for assigned devices guest
> + * owns the first level page tables. Invalidations of translation caches in the
> + * guest are trapped and passed down to the host.
> + *
> + * vIOMMU in the guest will only expose first level page tables, therefore
> + * we do not support IOTLB granularity for request without PASID (second level).
> + *
> + * For example, to find the VT-d granularity encoding for IOTLB
> + * type and page selective granularity within PASID:
> + * X: indexed by iommu cache type
> + * Y: indexed by enum iommu_inv_granularity
> + * [IOMMU_CACHE_INV_TYPE_IOTLB][IOMMU_INV_GRANU_ADDR]
> + */
> +
> +const static int inv_type_granu_table[IOMMU_CACHE_INV_TYPE_NR][IOMMU_INV_GRANU_NR] = {
> + /*
> + * PASID based IOTLB invalidation: PASID selective (per PASID),
> + * page selective (address granularity)
> + */
> + {-EINVAL, QI_GRAN_NONG_PASID, QI_GRAN_PSI_PASID},
> + /* PASID based dev TLBs */
> + {-EINVAL, -EINVAL, QI_DEV_IOTLB_GRAN_PASID_SEL},
> + /* PASID cache */
> + {-EINVAL, -EINVAL, -EINVAL}
> +};
> +
> +static inline int to_vtd_granularity(int type, int granu)
> +{
> + return inv_type_granu_table[type][granu];
> +}
> +
> +static inline u64 to_vtd_size(u64 granu_size, u64 nr_granules)
> +{
> + u64 nr_pages = (granu_size * nr_granules) >> VTD_PAGE_SHIFT;
> +
> + /* VT-d size is encoded as 2^size of 4K pages, 0 for 4k, 9 for 2MB, etc.
> + * IOMMU cache invalidate API passes granu_size in bytes, and number of
> + * granu size in contiguous memory.
> + */
> + return order_base_2(nr_pages);
> +}
> +
> +#ifdef CONFIG_INTEL_IOMMU_SVM
> +static int intel_iommu_sva_invalidate(struct iommu_domain *domain,
> + struct device *dev, struct iommu_cache_invalidate_info *inv_info)
> +{
> + struct dmar_domain *dmar_domain = to_dmar_domain(domain);
> + struct device_domain_info *info;
> + struct intel_iommu *iommu;
> + unsigned long flags;
> + int cache_type;
> + u8 bus, devfn;
> + u16 did, sid;
> + int ret = 0;
> + u64 size = 0;
> +
> + if (!inv_info || !dmar_domain ||
> + inv_info->version != IOMMU_CACHE_INVALIDATE_INFO_VERSION_1)
> + return -EINVAL;
> +
> + if (!dev || !dev_is_pci(dev))
> + return -ENODEV;
Check (domain->flags & DOMAIN_FLAG_NESTING_MODE)?
> +
> + iommu = device_to_iommu(dev, &bus, &devfn);
> + if (!iommu)
> + return -ENODEV;
> +
> + spin_lock_irqsave(&device_domain_lock, flags);
> + spin_lock(&iommu->lock);
> + info = iommu_support_dev_iotlb(dmar_domain, iommu, bus, devfn);
> + if (!info) {
> + ret = -EINVAL;
> + goto out_unlock;
> + }
> + did = dmar_domain->iommu_did[iommu->seq_id];
> + sid = PCI_DEVID(bus, devfn);
> +
> + /* Size is only valid in non-PASID selective invalidation */
> + if (inv_info->granularity != IOMMU_INV_GRANU_PASID)
> + size = to_vtd_size(inv_info->addr_info.granule_size,
> + inv_info->addr_info.nb_granules);
> +
> + for_each_set_bit(cache_type, (unsigned long *)&inv_info->cache, IOMMU_CACHE_INV_TYPE_NR) {
> + int granu = 0;
> + u64 pasid = 0;
> +
> + granu = to_vtd_granularity(cache_type, inv_info->granularity);
> + if (granu == -EINVAL) {
> + pr_err("Invalid cache type and granu combination %d/%d\n", cache_type,
> + inv_info->granularity);
rate unlimited traces here and after.
ret = -EINVAL?
also related to the discussion we had on the VFIO series. What is the
error policy?
> + break;
> + }
> +
> + /* PASID is stored in different locations based on granularity */
not sure the above comment really is requested
> + if (inv_info->granularity == IOMMU_INV_GRANU_PASID &&
> + inv_info->pasid_info.flags & IOMMU_INV_PASID_FLAGS_PASID)
> + pasid = inv_info->pasid_info.pasid;
> + else if (inv_info->granularity == IOMMU_INV_GRANU_ADDR &&
> + inv_info->addr_info.flags & IOMMU_INV_ADDR_FLAGS_PASID)
> + pasid = inv_info->addr_info.pasid;
> +
> + switch (BIT(cache_type)) {
> + case IOMMU_CACHE_INV_TYPE_IOTLB:
> + if ((inv_info->granularity == IOMMU_INV_GRANU_ADDR) &&
> + size && (inv_info->addr_info.addr & ((BIT(VTD_PAGE_SHIFT + size)) - 1))) {
> + pr_err("Address out of range, 0x%llx, size order %llu\n",
> + inv_info->addr_info.addr, size);
> + ret = -ERANGE;
> + goto out_unlock;
> + }
> +
> + qi_flush_piotlb(iommu, did,
> + pasid,
> + mm_to_dma_pfn(inv_info->addr_info.addr),
This does not sound correct to me:
inv_info->addr_info.addr and inv_info->addr_info.flags are not valid in
case of PASID-selective invalidation
> + (granu == QI_GRAN_NONG_PASID) ? -1 : 1 << size,
> + inv_info->addr_info.flags & IOMMU_INV_ADDR_FLAGS_LEAF);
> +
> + /*
> + * Always flush device IOTLB if ATS is enabled. vIOMMU
> + * in the guest may assume IOTLB flush is inclusive,
> + * which is more efficient.
> + */
> + if (info->ats_enabled)
> + qi_flush_dev_iotlb_pasid(iommu, sid, info->pfsid,
> + pasid, info->ats_qdep,
> + inv_info->addr_info.addr, size,
same
> + granu);
> + break;
> + case IOMMU_CACHE_INV_TYPE_DEV_IOTLB:
> + if (info->ats_enabled)
> + qi_flush_dev_iotlb_pasid(iommu, sid, info->pfsid,
> + inv_info->addr_info.pasid, info->ats_qdep,
nit: use pasid directly
> + inv_info->addr_info.addr, size,
> + granu);
> + else
> + pr_warn("Passdown device IOTLB flush w/o ATS!\n");
> + break;
> + case IOMMU_CACHE_INV_TYPE_PASID:
> + qi_flush_pasid_cache(iommu, did, granu, inv_info->pasid_info.pasid);
> + break;
> + default:
> + dev_err(dev, "Unsupported IOMMU invalidation type %d\n",
> + cache_type);
> + ret = -EINVAL;
> + }
> + }
> +out_unlock:
> + spin_unlock(&iommu->lock);
> + spin_unlock_irqrestore(&device_domain_lock, flags);
> +
> + return ret;
> +}
> +#endif
> +
> static int intel_iommu_map(struct iommu_domain *domain,
> unsigned long iova, phys_addr_t hpa,
> size_t size, int iommu_prot, gfp_t gfp)
> @@ -6179,6 +6336,7 @@ const struct iommu_ops intel_iommu_ops = {
> .is_attach_deferred = intel_iommu_is_attach_deferred,
> .pgsize_bitmap = INTEL_IOMMU_PGSIZES,
> #ifdef CONFIG_INTEL_IOMMU_SVM
> + .cache_invalidate = intel_iommu_sva_invalidate,
> .sva_bind_gpasid = intel_svm_bind_gpasid,
> .sva_unbind_gpasid = intel_svm_unbind_gpasid,
> #endif
>
Thanks
Eric
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