From: Lu Baolu baolu.lu@linux.intel.com
The nested domain fields are exclusive to those that used for a DMA remapping domain. Use union to avoid memory waste.
Reviewed-by: Kevin Tian kevin.tian@intel.com Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Signed-off-by: Yi Liu yi.l.liu@intel.com --- drivers/iommu/intel/iommu.h | 35 +++++++++++++++++++++++++++++------ 1 file changed, 29 insertions(+), 6 deletions(-)
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h index c18fb699c87a..4a7f1cc16afa 100644 --- a/drivers/iommu/intel/iommu.h +++ b/drivers/iommu/intel/iommu.h @@ -597,15 +597,38 @@ struct dmar_domain { struct list_head devices; /* all devices' list */ struct list_head dev_pasids; /* all attached pasids */
- struct dma_pte *pgd; /* virtual address */ - int gaw; /* max guest address width */ - - /* adjusted guest address width, 0 is level 2 30-bit */ - int agaw; int iommu_superpage;/* Level of superpages supported: 0 == 4KiB (no superpages), 1 == 2MiB, 2 == 1GiB, 3 == 512GiB, 4 == 1TiB */ - u64 max_addr; /* maximum mapped address */ + union { + /* DMA remapping domain */ + struct { + /* virtual address */ + struct dma_pte *pgd; + /* max guest address width */ + int gaw; + /* + * adjusted guest address width: + * 0: level 2 30-bit + * 1: level 3 39-bit + * 2: level 4 48-bit + * 3: level 5 57-bit + */ + int agaw; + /* maximum mapped address */ + u64 max_addr; + }; + + /* Nested user domain */ + struct { + /* parent page table which the user domain is nested on */ + struct dmar_domain *s2_domain; + /* user page table pointer (in GPA) */ + unsigned long s1_pgtbl; + /* page table attributes */ + struct iommu_hwpt_vtd_s1 s1_cfg; + }; + };
struct iommu_domain domain; /* generic domain data structure for iommu core */