cfe65f4037
Our function tests found several issues related to reusing vGPU instance. They are qemu reboot failure, guest tdr after reboot, host hang when reboot guest. All these issues are caused by dirty status inherited from last VM. This patch fix all these issues by resetting a virtual GPU before VM use it. The reset logical is put into a low level function _intel_gvt_reset_vgpu(), which supports Device Model Level Reset, Full GT Reset and Per-Engine Reset. vGPU Device Model Level Reset (DMLR) simulates the PCI reset to reset the whole vGPU to default state as when it is created, including GTT, execlist, scratch pages, cfg space, mmio space, pvinfo page, scheduler and fence registers. The ultimate goal of vGPU DMLR is that reuse a vGPU instance by different virtual machines. When we reassign a vGPU to a virtual machine we must issue such reset first. Full GT Reset and Per-Engine GT Reset are soft reset flow for GPU engines (Render, Blitter, Video, Video Enhancement). It is defined by GPU Spec. Unlike the FLR, GT reset only reset particular resource of a vGPU per the reset request. Guest driver can issue a GT reset by programming the virtual GDRST register to reset specific virtual GPU engine or all engines. Since vGPU DMLR and GT reset can share some code so we implement both these two into one single function intel_gvt_reset_vgpu_locked(). The parameter dmlr is to identify if we will do FLR or GT reset. The parameter engine_mask is to specific the engines that need to be resetted. If value ALL_ENGINES is given for engine_mask, it means the caller requests a full gt reset that we will reset all virtual GPU engines. Signed-off-by: Changbin Du <changbin.du@intel.com> Reviewed-by: Jike Song <jike.song@intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com> |
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README
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.