Messages in this thread | | | Date | Mon, 21 Mar 2022 18:23:07 +0800 | Subject | Re: [PATCH RFC 02/11] iommu: Add iommu_domain type for SVA | From | Lu Baolu <> |
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On 2022/3/21 15:06, Tian, Kevin wrote: >> From: Lu Baolu<baolu.lu@linux.intel.com> >> Sent: Sunday, March 20, 2022 2:40 PM >> >> Add a new iommu domain type IOMMU_DOMAIN_SVA to represent an I/O >> page >> table which is shared from CPU host VA. Add a sva_cookie field in the >> iommu_domain structure to save the mm_struct which represent the CPU >> memory page table. >> >> Signed-off-by: Lu Baolu<baolu.lu@linux.intel.com> >> --- >> include/linux/iommu.h | 6 ++++++ >> 1 file changed, 6 insertions(+) >> >> diff --git a/include/linux/iommu.h b/include/linux/iommu.h >> index 36f43af0af53..3e179b853380 100644 >> --- a/include/linux/iommu.h >> +++ b/include/linux/iommu.h >> @@ -64,6 +64,9 @@ struct iommu_domain_geometry { >> #define __IOMMU_DOMAIN_PT (1U << 2) /* Domain is identity >> mapped */ >> #define __IOMMU_DOMAIN_DMA_FQ (1U << 3) /* DMA-API uses >> flush queue */ >> >> +#define __IOMMU_DOMAIN_SHARED (1U << 4) /* Page table shared from >> CPU */ >> +#define __IOMMU_DOMAIN_HOST_VA (1U << 5) /* Host CPU virtual >> address */ > suppose the SHARED bit will be also used for KVM page table sharing and > HOST_VA bit is to differentiate mm sharing from the latter? >
Yes, that's my intention.
Best regards, baolu
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