[PATCH 15/17] iommu/vt-d: Mark irt entries from old kernel as allocated

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



From: Joerg Roedel <jroedel@xxxxxxx>

After we copied over all irq remapping entries from the old
kernel we need to mark the present entries as allocated in
our table too. Otherwise we might overwrite entries from the
previous kernel and cause DMAR faults.

Tested-by: Baoquan He <bhe@xxxxxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
---
 drivers/iommu/intel_irq_remapping.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/intel_irq_remapping.c b/drivers/iommu/intel_irq_remapping.c
index fd6c25b..f7b02ca 100644
--- a/drivers/iommu/intel_irq_remapping.c
+++ b/drivers/iommu/intel_irq_remapping.c
@@ -1300,6 +1300,7 @@ static int iommu_load_old_irte(struct intel_iommu *iommu)
 {
 	struct irte *old_ir_table;
 	phys_addr_t irt_phys;
+	unsigned int i;
 	size_t size;
 	u64 irta;
 
@@ -1325,6 +1326,15 @@ static int iommu_load_old_irte(struct intel_iommu *iommu)
 	iommu->ir_table->base_old_phys = irt_phys;
 	iommu->ir_table->base_old_virt = old_ir_table;
 
+	/*
+	 * Now check the table for used entries and mark those as
+	 * allocated in the bitmap
+	 */
+	for (i = 0; i < INTR_REMAP_TABLE_ENTRIES; i++) {
+		if (iommu->ir_table->base[i].present)
+			bitmap_set(iommu->ir_table->bitmap, i, 1);
+	}
+
 	return 0;
 }
 
-- 
1.9.1

--
To unsubscribe from this list: send the line "unsubscribe linux-pci" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html




[Index of Archives]     [DMA Engine]     [Linux Coverity]     [Linux USB]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [Greybus]

  Powered by Linux