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Message-ID: <56A86482.4090009@intel.com> Date: Wed, 27 Jan 2016 14:32:34 +0800 From: Jike Song <jike.song@...el.com> To: kvm@...r.kernel.org, igvt-g@...ts.01.org, intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org CC: "Tian, Kevin" <kevin.tian@...el.com>, "Cowperthwaite, David J" <david.j.cowperthwaite@...el.com>, "Dong, Eddie" <eddie.dong@...el.com>, "Li, Susie" <susie.li@...el.com>, "Downs, Mike" <mike.downs@...el.com>, "Reddy, Raghuveer" <raghuveer.reddy@...el.com>, "Wang, Hongbo" <hongbo.wang@...el.com> Subject: Re: [ANNOUNCE] 2015-Q4 release of KVMGT (Was Re: KVMGT - the implementation of ...) Hi all, We are pleased to announce another update of Intel GVT-g for KVM. Intel GVT-g for KVM (a.k.a. KVMGT) is a full GPU virtualization solution with mediated pass-through, starting from 4th generation Intel Core(TM) processors with Intel Graphics processors. A virtual GPU instance is maintained for each VM, with part of performance critical resources directly assigned. The capability of running native graphics driver inside a VM, without hypervisor intervention in performance critical paths, achieves a good balance among performance, feature, and sharing capability. Repositories: Kernel: https://github.com/01org/igvtg-kernel (2015q4-4.2.0 branch) Qemu: https://github.com/01org/igvtg-qemu (kvmgt_public2015q4 branch) This update consists of: - KVMGT now has better support for 5th generation (Broadwell) Intel Core(TM) processors, 2D/3D/Media workloads can be run simultaneously in multiple guests. - Host Linux kernel has been upgraded from 3.18.0 to 4.2.0 (based on drm-intel) Next update will be around early April, 2016. Known issues: - At least 2GB memory is suggested for VM to run most 3D workloads. - Using VLC to play .ogg file may cause mosaic or slow response. - Running heavy 3D workloads in multiple guests for couple of hours may cause stability issue. Official iGVT-g portal: https://01.org/igvt-g Please subscribe the mailing list: https://lists.01.org/mailman/listinfo/igvt-g More information about background, architecture and others about Intel GVT-g, can be found at: http://www.linux-kvm.org/images/f/f3/01x08b-KVMGT-a.pdf https://www.usenix.org/conference/atc14/technical-sessions/presentation/tian Note: The KVMGT project should be considered a work in progress. As such it is not a complete product nor should it be considered one. Extra care should be taken when testing and configuring a system to use the KVMGT project. -- Thanks, Jike On 10/27/2015 05:36 PM, Jike Song wrote: > Hi all, > > We are pleased to announce another update of Intel GVT-g for KVM. > > Intel GVT-g is a full GPU virtualization solution with mediated pass-through, starting from 4th generation Intel Core(TM) processors with Intel Graphics processors. A virtual GPU instance is maintained for each VM, with part of performance critical resources directly assigned. The capability of running native graphics driver inside a VM, without hypervisor intervention in performance critical paths, achieves a good balance among performance, feature, and sharing capability. KVM is supported by Intel GVT-g(a.k.a. KVMGT). > > > Repositories > > Kernel: https://github.com/01org/igvtg-kernel (2015q3-3.18.0 branch) > Qemu: https://github.com/01org/igvtg-qemu (kvmgt_public2015q3 branch) > > > This update consists of: > > - KVMGT is now merged with XenGT in unified repositories(kernel and qemu), but currently > different branches for qemu. KVMGT and XenGT share same iGVT-g core logic. > - PPGTT supported, hence the Windows guest support > - KVMGT now supports both 4th generation (Haswell) and 5th generation (Broadwell) Intel Core(TM) processors > - 2D/3D/Media decoding have been validated on Ubuntu 14.04 and Windows7/Windows 8.1 > > Next update will be around early Jan, 2016. > > Known issues: > > - At least 2GB memory is suggested for VM to run most 3D workloads. > - 3Dmark06 running in Windows VM may have some stability issue. > - Using VLC to play .ogg file may cause mosaic or slow response. > > > Please subscribe the mailing list to report BUGs, discuss, and/or contribute: > > https://lists.01.org/mailman/listinfo/igvt-g > > More information about Intel GVT-g background, architecture, etc can be found at(may not be up-to-date): > > https://01.org/igvt-g > http://www.linux-kvm.org/images/f/f3/01x08b-KVMGT-a.pdf > https://www.usenix.org/conference/atc14/technical-sessions/presentation/tian > > > Note: > > The KVMGT project should be considered a work in progress. As such it is not a complete product nor should it be considered one. Extra care should be taken when testing and configuring a system to use the KVMGT project. > > > -- > Thanks, > Jike > > On 12/04/2014 10:24 AM, Jike Song wrote: >> Hi all, >> >> We are pleased to announce the first release of KVMGT project. KVMGT is the implementation of Intel GVT-g technology, a full GPU virtualization solution. Under Intel GVT-g, a virtual GPU instance is maintained for each VM, with part of performance critical resources directly assigned. The capability of running native graphics driver inside a VM, without hypervisor intervention in performance critical paths, achieves a good balance of performance, feature, and sharing capability. >> >> >> KVMGT is still in the early stage: >> >> - Basic functions of full GPU virtualization works, guest can see a full-featured vGPU. >> We ran several 3D workloads such as lightsmark, nexuiz, urbanterror and warsow. >> >> - Only Linux guest supported so far, and PPGTT must be disabled in guest through a >> kernel parameter(see README.kvmgt in QEMU). >> >> - This drop also includes some Xen specific changes, which will be cleaned up later. >> >> - Our end goal is to upstream both XenGT and KVMGT, which shares ~90% logic for vGPU >> device model (will be part of i915 driver), with only difference in hypervisor >> specific services >> >> - insufficient test coverage, so please bear with stability issues :) >> >> >> >> There are things need to be improved, esp. the KVM interfacing part: >> >> 1 a domid was added to each KVMGT guest >> >> An ID is needed for foreground OS switching, e.g. >> >> # echo <domid> > /sys/kernel/vgt/control/foreground_vm >> >> domid 0 is reserved for host OS. >> >> >> 2 SRCU workarounds. >> >> Some KVM functions, such as: >> >> kvm_io_bus_register_dev >> install_new_memslots >> >> must be called *without* &kvm->srcu read-locked. Otherwise it hangs. >> >> In KVMGT, we need to register an iodev only *after* BAR registers are >> written by guest. That means, we already have &kvm->srcu hold - >> trapping/emulating PIO(BAR registers) makes us in such a condition. >> That will make kvm_io_bus_register_dev hangs. >> >> Currently we have to disable rcu_assign_pointer() in such functions. >> >> These were dirty workarounds, your suggestions are high welcome! >> >> >> 3 syscalls were called to access "/dev/mem" from kernel >> >> An in-kernel memslot was added for aperture, but using syscalls like >> open and mmap to open and access the character device "/dev/mem", >> for pass-through. >> >> >> >> >> The source codes(kernel, qemu as well as seabios) are available at github: >> >> git://github.com/01org/KVMGT-kernel >> git://github.com/01org/KVMGT-qemu >> git://github.com/01org/KVMGT-seabios >> >> In the KVMGT-qemu repository, there is a "README.kvmgt" to be referred. >> >> >> >> More information about Intel GVT-g and KVMGT can be found at: >> >> https://www.usenix.org/conference/atc14/technical-sessions/presentation/tian >> http://events.linuxfoundation.org/sites/events/files/slides/KVMGT-a%20Full%20GPU%20Virtualization%20Solution_1.pdf >> >> >> Appreciate your comments, BUG reports, and contributions! >> >> >> >> >> -- >> Thanks, >> Jike >>
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