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Add alloc_private_vm_region() and free_private_vm_region() to allocate backing pages, map them through viommu_pdom, and tear down with an unmap flush on VM destroy. Charge GFP_KERNEL_ACCOUNT so the DevID/DomID pages count against the caller's memcg. iommufd already charges the vIOMMU object. Reviewed-by: Jason Gunthorpe Signed-off-by: Suravee Suthikulpanit --- drivers/iommu/amd/viommu.c | 39 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) diff --git a/drivers/iommu/amd/viommu.c b/drivers/iommu/amd/viommu.c index 3ec907a498c2..ad5f754f25a4 100644 --- a/drivers/iommu/amd/viommu.c +++ b/drivers/iommu/amd/viommu.c @@ -373,3 +373,42 @@ int __init amd_viommu_init(struct amd_iommu *iommu) amd_viommu_uninit(iommu); return ret; } + +static int __maybe_unused alloc_private_vm_region(struct amd_iommu *iommu, u64 **entry, + u64 base, size_t size, u16 gid) +{ + int ret; + void *va = NULL; + u64 addr = base + (gid * size); + + /* Charge the caller; boot IPA stays GFP_KERNEL. */ + ret = viommu_priv_alloc_map(iommu, addr, size, GFP_KERNEL_ACCOUNT, &va); + if (ret) { + *entry = NULL; + return ret; + } + + *entry = (u64 *)va; + + pr_debug("%s: entry=%#llx(%#llx), addr=%#llx, size=%#lx\n", __func__, + (unsigned long long)*entry, iommu_virt_to_phys(*entry), addr, size); + + return 0; +} + +static void __maybe_unused free_private_vm_region(struct amd_iommu *iommu, u64 **entry, + u64 base, size_t size, u16 gid) +{ + u64 addr = base + (gid * size); + + if (!iommu || !iommu->viommu_pdom || !*entry) + return; + + pr_debug("%s: entry=%#llx(%#llx), base=%#llx, addr=%#llx, size=%#lx\n", + __func__, (unsigned long long)*entry, + iommu_virt_to_phys(*entry), base, addr, size); + + viommu_priv_unmap_free(iommu, addr, size, *entry); + + *entry = NULL; +} -- 2.34.1