Messages in this thread Patch in this message |  | | From | Jacob Pan <> | Subject | [PATCH v8 06/10] iommu/vt-d: Cache virtual command capability register | Date | Mon, 16 Dec 2019 11:24:08 -0800 |
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Virtual command registers are used in the guest only, to prevent vmexit cost, we cache the capability and store it during initialization.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> --- drivers/iommu/dmar.c | 1 + include/linux/intel-iommu.h | 4 ++++ 2 files changed, 5 insertions(+)
diff --git a/drivers/iommu/dmar.c b/drivers/iommu/dmar.c index f2f5d75da94a..3f98dd9ad004 100644 --- a/drivers/iommu/dmar.c +++ b/drivers/iommu/dmar.c @@ -953,6 +953,7 @@ static int map_iommu(struct intel_iommu *iommu, u64 phys_addr) warn_invalid_dmar(phys_addr, " returns all ones"); goto unmap; } + iommu->vccap = dmar_readq(iommu->reg + DMAR_VCCAP_REG); /* the registers might be more than one page */ map_size = max_t(int, ecap_max_iotlb_offset(iommu->ecap), diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index ee26989df008..4d25141ec3df 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -189,6 +189,9 @@ #define ecap_max_handle_mask(e) ((e >> 20) & 0xf) #define ecap_sc_support(e) ((e >> 7) & 0x1) /* Snooping Control */ +/* Virtual command interface capabilities */ +#define vccap_pasid(v) ((v & DMA_VCS_PAS)) /* PASID allocation */ + /* IOTLB_REG */ #define DMA_TLB_FLUSH_GRANU_OFFSET 60 #define DMA_TLB_GLOBAL_FLUSH (((u64)1) << 60) @@ -531,6 +534,7 @@ struct intel_iommu { u64 reg_size; /* size of hw register set */ u64 cap; u64 ecap; + u64 vccap; u32 gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */ raw_spinlock_t register_lock; /* protect register handling */ int seq_id; /* sequence id of the iommu */ -- 2.7.4
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