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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 21-01-28 23:17:41, Keqian Zhu wrote: [...] > +static void vfio_dma_dirty_log_start(struct vfio_iommu *iommu, > + struct vfio_dma *dma) > +{ > + struct vfio_domain *d; > + > + list_for_each_entry(d, &iommu->domain_list, next) { > + /* Go through all domain anyway even if we fail */ > + iommu_split_block(d->domain, dma->iova, dma->size); > + } > +} This should be a switch to prepare for dirty log start. Per Intel Vtd spec, there is SLADE defined in Scalable-Mode PASID Table Entry. It enables Accessed/Dirty Flags in second-level paging entries. So, a generic iommu interface here is better. For Intel iommu, it enables SLADE. For ARM, it splits block. > + > +static void vfio_dma_dirty_log_stop(struct vfio_iommu *iommu, > + struct vfio_dma *dma) > +{ > + struct vfio_domain *d; > + > + list_for_each_entry(d, &iommu->domain_list, next) { > + /* Go through all domain anyway even if we fail */ > + iommu_merge_page(d->domain, dma->iova, dma->size, > + d->prot | dma->prot); > + } > +} Same as above comment, a generic interface is required here. > + > +static void vfio_iommu_dirty_log_switch(struct vfio_iommu *iommu, bool start) > +{ > + struct rb_node *n; > + > + /* Split and merge even if all iommu don't support HWDBM now */ > + for (n = rb_first(&iommu->dma_list); n; n = rb_next(n)) { > + struct vfio_dma *dma = rb_entry(n, struct vfio_dma, node); > + > + if (!dma->iommu_mapped) > + continue; > + > + /* Go through all dma range anyway even if we fail */ > + if (start) > + vfio_dma_dirty_log_start(iommu, dma); > + else > + vfio_dma_dirty_log_stop(iommu, dma); > + } > +} > + > static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu, > unsigned long arg) > { > @@ -2812,8 +2900,10 @@ static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu, > pgsize = 1 << __ffs(iommu->pgsize_bitmap); > if (!iommu->dirty_page_tracking) { > ret = vfio_dma_bitmap_alloc_all(iommu, pgsize); > - if (!ret) > + if (!ret) { > iommu->dirty_page_tracking = true; > + vfio_iommu_dirty_log_switch(iommu, true); > + } > } > mutex_unlock(&iommu->lock); > return ret; > @@ -2822,6 +2912,7 @@ static int vfio_iommu_type1_dirty_pages(struct vfio_iommu *iommu, > if (iommu->dirty_page_tracking) { > iommu->dirty_page_tracking = false; > vfio_dma_bitmap_free_all(iommu); > + vfio_iommu_dirty_log_switch(iommu, false); > } > mutex_unlock(&iommu->lock); > return 0; > -- > 2.19.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel