| Message ID | 20230511145110.27707-3-yi.l.liu@intel.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Add Intel VT-d nested translation | expand |
> From: Liu, Yi L <yi.l.liu@intel.com> > Sent: Thursday, May 11, 2023 10:51 PM > > 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. > > 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 1c5e1d88862b..e818520f4068 100644 > --- a/drivers/iommu/intel/iommu.h > +++ b/drivers/iommu/intel/iommu.h > @@ -596,15 +596,38 @@ struct dmar_domain { > spinlock_t lock; /* Protect device tracking lists */ > struct list_head devices; /* all devices' list */ > > - 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; > + }; what about 'nid'? > + > + /* Nested user domain */ > + struct { > + /* 2-level page table the user domain nested */ /* 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_intel_vtd s1_cfg; > + }; > + }; > > struct iommu_domain domain; /* generic domain data structure for > iommu core */ > -- > 2.34.1
On 5/24/23 3:02 PM, Tian, Kevin wrote: >> From: Liu, Yi L<yi.l.liu@intel.com> >> Sent: Thursday, May 11, 2023 10:51 PM >> >> 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. >> >> 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 1c5e1d88862b..e818520f4068 100644 >> --- a/drivers/iommu/intel/iommu.h >> +++ b/drivers/iommu/intel/iommu.h >> @@ -596,15 +596,38 @@ struct dmar_domain { >> spinlock_t lock; /* Protect device tracking lists */ >> struct list_head devices; /* all devices' list */ >> >> - 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; >> + }; > what about 'nid'? "nid" represents which NUMA node should we allocate pages from for this domain. It's updated every time when a domain is attached/detached to/from a device or pasid. Generally speaking, "nid" is common for all types of domain. But in this case, only a DMA remapping domain has a need to allocate pages. I intend to keep it as it for now. There's more cleanup rooms if we limit it only for DMA remapping domain. Best regards, baolu
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h index 1c5e1d88862b..e818520f4068 100644 --- a/drivers/iommu/intel/iommu.h +++ b/drivers/iommu/intel/iommu.h @@ -596,15 +596,38 @@ struct dmar_domain { spinlock_t lock; /* Protect device tracking lists */ struct list_head devices; /* all devices' list */ - 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 { + /* 2-level page table the user domain nested */ + struct dmar_domain *s2_domain; + /* user page table pointer (in GPA) */ + unsigned long s1_pgtbl; + /* page table attributes */ + struct iommu_hwpt_intel_vtd s1_cfg; + }; + }; struct iommu_domain domain; /* generic domain data structure for iommu core */