From: Kunkun Jiang jiangkunkun@huawei.com
virt inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8UZSP CVE: NA
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We are going to optimize dirty log tracking based on iommu dirty log tracking, but the dirty log from iommu is useful only when all iommu backed domains support it.
This maintains a counter in vfio_iommu, which is used for dirty bitmap population in next patch.
This also maintains a boolean flag in vfio_domain, which is used in the policy of switch dirty log in next patch.
Co-developed-by: Keqian Zhu zhukeqian1@huawei.com Signed-off-by: Kunkun Jiang jiangkunkun@huawei.com Reviewed-by: Keqian Zhu zhukeqian1@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Signed-off-by: jiaqingtong jiaqingtong@huawei.com --- drivers/vfio/vfio_iommu_type1.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+)
diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index eacd6ec04de5..398dce33b530 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -71,6 +71,7 @@ struct vfio_iommu { unsigned int vaddr_invalid_count; uint64_t pgsize_bitmap; uint64_t num_non_pinned_groups; + uint64_t num_non_hwdbm_domains; bool v2; bool nesting; bool dirty_page_tracking; @@ -83,6 +84,7 @@ struct vfio_domain { struct list_head group_list; bool fgsp : 1; /* Fine-grained super pages */ bool enforce_cache_coherency : 1; + bool iommu_hwdbm; /* Hardware dirty management */ };
struct vfio_dma { @@ -2149,6 +2151,26 @@ static int vfio_iommu_domain_alloc(struct device *dev, void *data) return 1; /* Don't iterate */ }
+/* + * Called after a new group is added to the iommu_domain, or an old group is + * removed from the iommu_domain. Update the HWDBM status of vfio_domain and + * vfio_iommu. + */ +static void vfio_iommu_update_hwdbm(struct vfio_iommu *iommu, + struct vfio_domain *domain, + bool attach) +{ + bool old_hwdbm = domain->iommu_hwdbm; + bool new_hwdbm = iommu_support_dirty_log(domain->domain); + + if (old_hwdbm && !new_hwdbm && attach) { + iommu->num_non_hwdbm_domains++; + } else if (!old_hwdbm && new_hwdbm && !attach) { + iommu->num_non_hwdbm_domains--; + } + domain->iommu_hwdbm = new_hwdbm; +} + static int vfio_iommu_type1_attach_group(void *iommu_data, struct iommu_group *iommu_group, enum vfio_group_type type) { @@ -2291,6 +2313,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data, if (!iommu_attach_group(d->domain, group->iommu_group)) { list_add(&group->next, &d->group_list); + vfio_iommu_update_hwdbm(iommu, d, true); iommu_domain_free(domain->domain); kfree(domain); goto done; @@ -2318,6 +2341,7 @@ static int vfio_iommu_type1_attach_group(void *iommu_data,
list_add(&domain->next, &iommu->domain_list); vfio_update_pgsize_bitmap(iommu); + vfio_iommu_update_hwdbm(iommu, domain, true); done: /* Delete the old one and insert new iova list */ vfio_iommu_iova_insert_copy(iommu, &iova_copy); @@ -2496,6 +2520,7 @@ static void vfio_iommu_type1_detach_group(void *iommu_data, continue;
iommu_detach_group(domain->domain, group->iommu_group); + vfio_iommu_update_hwdbm(iommu, domain, false); update_dirty_scope = !group->pinned_page_dirty_scope; list_del(&group->next); kfree(group);