forked from Minki/linux
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>
365 lines
9.6 KiB
C
365 lines
9.6 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_MPT_H_
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#define _GVT_MPT_H_
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/**
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* DOC: Hypervisor Service APIs for GVT-g Core Logic
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*
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* This is the glue layer between specific hypervisor MPT modules and GVT-g core
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* logic. Each kind of hypervisor MPT module provides a collection of function
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* callbacks and will be attached to GVT host when the driver is loading.
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* GVT-g core logic will call these APIs to request specific services from
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* hypervisor.
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*/
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/**
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* intel_gvt_hypervisor_host_init - init GVT-g host side
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*
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* Returns:
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* Zero on success, negative error code if failed
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*/
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static inline int intel_gvt_hypervisor_host_init(struct device *dev,
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void *gvt, const void *ops)
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{
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/* optional to provide */
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if (!intel_gvt_host.mpt->host_init)
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return 0;
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return intel_gvt_host.mpt->host_init(dev, gvt, ops);
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}
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/**
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* intel_gvt_hypervisor_host_exit - exit GVT-g host side
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*/
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static inline void intel_gvt_hypervisor_host_exit(struct device *dev,
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void *gvt)
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{
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/* optional to provide */
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if (!intel_gvt_host.mpt->host_exit)
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return;
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intel_gvt_host.mpt->host_exit(dev, gvt);
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}
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/**
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* intel_gvt_hypervisor_attach_vgpu - call hypervisor to initialize vGPU
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* related stuffs inside hypervisor.
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_attach_vgpu(struct intel_vgpu *vgpu)
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{
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/* optional to provide */
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if (!intel_gvt_host.mpt->attach_vgpu)
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return 0;
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return intel_gvt_host.mpt->attach_vgpu(vgpu, &vgpu->handle);
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}
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/**
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* intel_gvt_hypervisor_detach_vgpu - call hypervisor to release vGPU
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* related stuffs inside hypervisor.
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline void intel_gvt_hypervisor_detach_vgpu(struct intel_vgpu *vgpu)
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{
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/* optional to provide */
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if (!intel_gvt_host.mpt->detach_vgpu)
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return;
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intel_gvt_host.mpt->detach_vgpu(vgpu->handle);
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}
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#define MSI_CAP_CONTROL(offset) (offset + 2)
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#define MSI_CAP_ADDRESS(offset) (offset + 4)
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#define MSI_CAP_DATA(offset) (offset + 8)
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#define MSI_CAP_EN 0x1
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/**
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* intel_gvt_hypervisor_inject_msi - inject a MSI interrupt into vGPU
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_inject_msi(struct intel_vgpu *vgpu)
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{
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unsigned long offset = vgpu->gvt->device_info.msi_cap_offset;
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u16 control, data;
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u32 addr;
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int ret;
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control = *(u16 *)(vgpu_cfg_space(vgpu) + MSI_CAP_CONTROL(offset));
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addr = *(u32 *)(vgpu_cfg_space(vgpu) + MSI_CAP_ADDRESS(offset));
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data = *(u16 *)(vgpu_cfg_space(vgpu) + MSI_CAP_DATA(offset));
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/* Do not generate MSI if MSIEN is disable */
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if (!(control & MSI_CAP_EN))
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return 0;
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if (WARN(control & GENMASK(15, 1), "only support one MSI format\n"))
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return -EINVAL;
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trace_inject_msi(vgpu->id, addr, data);
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ret = intel_gvt_host.mpt->inject_msi(vgpu->handle, addr, data);
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if (ret)
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return ret;
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return 0;
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}
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/**
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* intel_gvt_hypervisor_set_wp_page - translate a host VA into MFN
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* @p: host kernel virtual address
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*
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* Returns:
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* MFN on success, INTEL_GVT_INVALID_ADDR if failed.
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*/
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static inline unsigned long intel_gvt_hypervisor_virt_to_mfn(void *p)
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{
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return intel_gvt_host.mpt->from_virt_to_mfn(p);
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}
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/**
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* intel_gvt_hypervisor_enable_page_track - track a guest page
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* @vgpu: a vGPU
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* @gfn: the gfn of guest
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_enable_page_track(
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struct intel_vgpu *vgpu, unsigned long gfn)
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{
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return intel_gvt_host.mpt->enable_page_track(vgpu->handle, gfn);
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}
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/**
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* intel_gvt_hypervisor_disable_page_track - untrack a guest page
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* @vgpu: a vGPU
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* @gfn: the gfn of guest
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_disable_page_track(
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struct intel_vgpu *vgpu, unsigned long gfn)
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{
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return intel_gvt_host.mpt->disable_page_track(vgpu->handle, gfn);
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}
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/**
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* intel_gvt_hypervisor_read_gpa - copy data from GPA to host data buffer
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* @vgpu: a vGPU
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* @gpa: guest physical address
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* @buf: host data buffer
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* @len: data length
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_read_gpa(struct intel_vgpu *vgpu,
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unsigned long gpa, void *buf, unsigned long len)
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{
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return intel_gvt_host.mpt->read_gpa(vgpu->handle, gpa, buf, len);
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}
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/**
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* intel_gvt_hypervisor_write_gpa - copy data from host data buffer to GPA
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* @vgpu: a vGPU
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* @gpa: guest physical address
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* @buf: host data buffer
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* @len: data length
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_write_gpa(struct intel_vgpu *vgpu,
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unsigned long gpa, void *buf, unsigned long len)
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{
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return intel_gvt_host.mpt->write_gpa(vgpu->handle, gpa, buf, len);
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}
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/**
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* intel_gvt_hypervisor_gfn_to_mfn - translate a GFN to MFN
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* @vgpu: a vGPU
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* @gpfn: guest pfn
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*
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* Returns:
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* MFN on success, INTEL_GVT_INVALID_ADDR if failed.
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*/
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static inline unsigned long intel_gvt_hypervisor_gfn_to_mfn(
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struct intel_vgpu *vgpu, unsigned long gfn)
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{
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return intel_gvt_host.mpt->gfn_to_mfn(vgpu->handle, gfn);
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}
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/**
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* intel_gvt_hypervisor_dma_map_guest_page - setup dma map for guest page
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* @vgpu: a vGPU
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* @gpfn: guest pfn
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* @dma_addr: retrieve allocated dma addr
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*
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* Returns:
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* 0 on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_dma_map_guest_page(
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struct intel_vgpu *vgpu, unsigned long gfn,
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dma_addr_t *dma_addr)
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{
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return intel_gvt_host.mpt->dma_map_guest_page(vgpu->handle, gfn,
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dma_addr);
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}
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/**
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* intel_gvt_hypervisor_dma_unmap_guest_page - cancel dma map for guest page
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* @vgpu: a vGPU
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* @dma_addr: the mapped dma addr
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*/
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static inline void intel_gvt_hypervisor_dma_unmap_guest_page(
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struct intel_vgpu *vgpu, dma_addr_t dma_addr)
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{
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intel_gvt_host.mpt->dma_unmap_guest_page(vgpu->handle, dma_addr);
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}
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/**
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* intel_gvt_hypervisor_map_gfn_to_mfn - map a GFN region to MFN
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* @vgpu: a vGPU
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* @gfn: guest PFN
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* @mfn: host PFN
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* @nr: amount of PFNs
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* @map: map or unmap
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_map_gfn_to_mfn(
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struct intel_vgpu *vgpu, unsigned long gfn,
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unsigned long mfn, unsigned int nr,
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bool map)
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{
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/* a MPT implementation could have MMIO mapped elsewhere */
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if (!intel_gvt_host.mpt->map_gfn_to_mfn)
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return 0;
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return intel_gvt_host.mpt->map_gfn_to_mfn(vgpu->handle, gfn, mfn, nr,
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map);
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}
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/**
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* intel_gvt_hypervisor_set_trap_area - Trap a guest PA region
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* @vgpu: a vGPU
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* @start: the beginning of the guest physical address region
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* @end: the end of the guest physical address region
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* @map: map or unmap
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_set_trap_area(
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struct intel_vgpu *vgpu, u64 start, u64 end, bool map)
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{
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/* a MPT implementation could have MMIO trapped elsewhere */
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if (!intel_gvt_host.mpt->set_trap_area)
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return 0;
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return intel_gvt_host.mpt->set_trap_area(vgpu->handle, start, end, map);
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}
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/**
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* intel_gvt_hypervisor_set_opregion - Set opregion for guest
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* @vgpu: a vGPU
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_set_opregion(struct intel_vgpu *vgpu)
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{
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if (!intel_gvt_host.mpt->set_opregion)
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return 0;
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return intel_gvt_host.mpt->set_opregion(vgpu);
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}
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/**
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* intel_gvt_hypervisor_get_vfio_device - increase vfio device ref count
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* @vgpu: a vGPU
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline int intel_gvt_hypervisor_get_vfio_device(struct intel_vgpu *vgpu)
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{
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if (!intel_gvt_host.mpt->get_vfio_device)
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return 0;
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return intel_gvt_host.mpt->get_vfio_device(vgpu);
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}
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/**
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* intel_gvt_hypervisor_put_vfio_device - decrease vfio device ref count
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* @vgpu: a vGPU
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*
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* Returns:
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* Zero on success, negative error code if failed.
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*/
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static inline void intel_gvt_hypervisor_put_vfio_device(struct intel_vgpu *vgpu)
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{
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if (!intel_gvt_host.mpt->put_vfio_device)
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return;
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intel_gvt_host.mpt->put_vfio_device(vgpu);
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}
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/**
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* intel_gvt_hypervisor_is_valid_gfn - check if a visible gfn
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* @vgpu: a vGPU
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* @gfn: guest PFN
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*
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* Returns:
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* true on valid gfn, false on not.
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*/
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static inline bool intel_gvt_hypervisor_is_valid_gfn(
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struct intel_vgpu *vgpu, unsigned long gfn)
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{
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if (!intel_gvt_host.mpt->is_valid_gfn)
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return true;
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return intel_gvt_host.mpt->is_valid_gfn(vgpu->handle, gfn);
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}
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#endif /* _GVT_MPT_H_ */
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