New subject: [PATCH openEuler-1.0-LTS 002/149] crypto: x86 - remove SHA multibuffer routines and mcryptd

30 Jun 2021

From: Eric Auger eric.auger@redhat.com
[ Upstream commit 5f64ce5411b467f1cfea6c63e2494c22b773582b ]
intel_iommu_get_resv_regions() aims to return the list of
reserved regions accessible by a given @device. However several
devices can access the same reserved memory region and when
building the list it is not safe to use a single iommu_resv_region
object, whose container is the RMRR. This iommu_resv_region must
be duplicated per device reserved region list.
Let's remove the struct iommu_resv_region from the RMRR unit
and allocate the iommu_resv_region directly in
intel_iommu_get_resv_regions(). We hold the dmar_global_lock instead
of the rcu-lock to allow sleeping.
Fixes: 0659b8dc45a6 ("iommu/vt-d: Implement reserved region get/put callbacks")
Signed-off-by: Eric Auger eric.auger@redhat.com
Reviewed-by: Lu Baolu baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel jroedel@suse.de
Signed-off-by: Sasha Levin sashal@kernel.org
Signed-off-by: Yang Yingliang yangyingliang@huawei.com
---
 drivers/iommu/intel-iommu.c | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index d62fb1c31749b..58614c469db4f 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -387,7 +387,6 @@ struct dmar_rmrr_unit {
    u64	end_address;		/* reserved end address */
    struct dmar_dev_scope *devices;	/* target devices */
    int	devices_cnt;		/* target device count */
-	struct iommu_resv_region *resv; /* reserved region handle */
 };
struct dmar_atsr_unit {
@@ -4214,7 +4213,6 @@ static inline void init_iommu_pm_ops(void) {}
 int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
 {
    struct acpi_dmar_reserved_memory *rmrr;
-	int prot = DMA_PTE_READ|DMA_PTE_WRITE;
    struct dmar_rmrr_unit *rmrru;
    size_t length;
@@ -4228,22 +4226,16 @@ int __init dmar_parse_one_rmrr(struct acpi_dmar_header *header, void *arg)
    rmrru->end_address = rmrr->end_address;
length = rmrr->end_address - rmrr->base_address + 1;
-	rmrru->resv = iommu_alloc_resv_region(rmrr->base_address, length, prot,
-					      IOMMU_RESV_DIRECT);
-	if (!rmrru->resv)
-		goto free_rmrru;
rmrru->devices = dmar_alloc_dev_scope((void *)(rmrr + 1),
    			((void *)rmrr) + rmrr->header.length,
    			&rmrru->devices_cnt);
    if (rmrru->devices_cnt && rmrru->devices == NULL)
-		goto free_all;
+		goto free_rmrru;
list_add(&rmrru->list, &dmar_rmrr_units);
return 0;
-free_all:
-	kfree(rmrru->resv);
 free_rmrru:
    kfree(rmrru);
 out:
@@ -4461,7 +4453,6 @@ static void intel_iommu_free_dmars(void)
    list_for_each_entry_safe(rmrru, rmrr_n, &dmar_rmrr_units, list) {
    	list_del(&rmrru->list);
    	dmar_free_dev_scope(&rmrru->devices, &rmrru->devices_cnt);
-		kfree(rmrru->resv);
    	kfree(rmrru);
    }
@@ -5258,22 +5249,33 @@ static void intel_iommu_remove_device(struct device *dev)
 static void intel_iommu_get_resv_regions(struct device *device,
    				 struct list_head *head)
 {
+	int prot = DMA_PTE_READ | DMA_PTE_WRITE;
    struct iommu_resv_region *reg;
    struct dmar_rmrr_unit *rmrr;
    struct device *i_dev;
    int i;
-	rcu_read_lock();
+	down_read(&dmar_global_lock);
    for_each_rmrr_units(rmrr) {
    	for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
    				  i, i_dev) {
+			struct iommu_resv_region *resv;
+			size_t length;
+
    		if (i_dev != device)
    			continue;
-			list_add_tail(&rmrr->resv->list, head);
+			length = rmrr->end_address - rmrr->base_address + 1;
+			resv = iommu_alloc_resv_region(rmrr->base_address,
+						       length, prot,
+						       IOMMU_RESV_DIRECT);
+			if (!resv)
+				break;
+
+			list_add_tail(&resv->list, head);
    	}
    }
-	rcu_read_unlock();
+	up_read(&dmar_global_lock);
reg = iommu_alloc_resv_region(IOAPIC_RANGE_START,
    			      IOAPIC_RANGE_END - IOAPIC_RANGE_START + 1,
@@ -5288,10 +5290,8 @@ static void intel_iommu_put_resv_regions(struct device *dev,
 {
    struct iommu_resv_region *entry, *next;
-	list_for_each_entry_safe(entry, next, head, list) {
-		if (entry->type == IOMMU_RESV_MSI)
-			kfree(entry);
-	}
+	list_for_each_entry_safe(entry, next, head, list)
+		kfree(entry);
 }
#ifdef CONFIG_INTEL_IOMMU_SVM
-- 
2.25.1

    

[PATCH openEuler-1.0-LTS 001/149] iommu/vt-d: Duplicate iommu_resv_region objects per device list