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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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cf4ee73fd9
The implementation of current kvmgt implicitly setup dma mapping at MPT API gfn_to_mfn. First this design against the API's original purpose. Second, there is no unmap hit in this design. The result is that the dma mapping keep growing larger and larger. For mutl-vm case, they will consume IOMMU IOVA low 4GB address space quickly and so tons of rbtree entries crated in the IOMMU IOVA allocator. Finally, single IOVA allocation can take as long as ~70ms. Such latency is intolerable. To address both above issues, this patch introduced two new MPT API: o dma_map_guest_page - setup dma map for guest page o dma_unmap_guest_page - cancel dma map for guest page The kvmgt implements these 2 API. And to reduce dma setup overhead for duplicated pages (eg. scratch pages), two caches are used: one is for mapping gfn to struct gvt_dma, another is for mapping dma addr to struct gvt_dma. With these 2 new API, the gtt now is able to cancel dma mapping when page table is invalidated. The dma mapping is not in a gradual increase now. v2: follow the old logic for VFIO_IOMMU_NOTIFY_DMA_UNMAP at this point. Cc: Hang Yuan <hang.yuan@intel.com> Cc: Xiong Zhang <xiong.y.zhang@intel.com> Signed-off-by: Changbin Du <changbin.du@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
73 lines
2.9 KiB
C
73 lines
2.9 KiB
C
/*
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* Copyright(c) 2011-2016 Intel Corporation. All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice (including the next
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* paragraph) shall be included in all copies or substantial portions of the
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* Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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* Authors:
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* Eddie Dong <eddie.dong@intel.com>
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* Dexuan Cui
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* Jike Song <jike.song@intel.com>
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*
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* Contributors:
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* Zhi Wang <zhi.a.wang@intel.com>
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*
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*/
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#ifndef _GVT_HYPERCALL_H_
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#define _GVT_HYPERCALL_H_
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/*
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* Specific GVT-g MPT modules function collections. Currently GVT-g supports
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* both Xen and KVM by providing dedicated hypervisor-related MPT modules.
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*/
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struct intel_gvt_mpt {
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int (*host_init)(struct device *dev, void *gvt, const void *ops);
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void (*host_exit)(struct device *dev, void *gvt);
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int (*attach_vgpu)(void *vgpu, unsigned long *handle);
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void (*detach_vgpu)(unsigned long handle);
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int (*inject_msi)(unsigned long handle, u32 addr, u16 data);
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unsigned long (*from_virt_to_mfn)(void *p);
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int (*enable_page_track)(unsigned long handle, u64 gfn);
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int (*disable_page_track)(unsigned long handle, u64 gfn);
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int (*read_gpa)(unsigned long handle, unsigned long gpa, void *buf,
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unsigned long len);
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int (*write_gpa)(unsigned long handle, unsigned long gpa, void *buf,
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unsigned long len);
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unsigned long (*gfn_to_mfn)(unsigned long handle, unsigned long gfn);
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int (*dma_map_guest_page)(unsigned long handle, unsigned long gfn,
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dma_addr_t *dma_addr);
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void (*dma_unmap_guest_page)(unsigned long handle, dma_addr_t dma_addr);
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int (*map_gfn_to_mfn)(unsigned long handle, unsigned long gfn,
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unsigned long mfn, unsigned int nr, bool map);
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int (*set_trap_area)(unsigned long handle, u64 start, u64 end,
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bool map);
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int (*set_opregion)(void *vgpu);
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int (*get_vfio_device)(void *vgpu);
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void (*put_vfio_device)(void *vgpu);
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bool (*is_valid_gfn)(unsigned long handle, unsigned long gfn);
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};
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extern struct intel_gvt_mpt xengt_mpt;
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extern struct intel_gvt_mpt kvmgt_mpt;
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#endif /* _GVT_HYPERCALL_H_ */
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