![]() Download the tcl and tk from http: //www. To install locally on Linux (I did it to my home directory), extract the . It worked for me - and I can now import Tkinter etc to my heart's content - yipidy- yay. An entire afternoon spent on this - hope this note saves others from the pain. I've used Vagrant for a while on a windows 7 system. Now I've a new PC with windows 10. I installed Oracle Virtual Box and Vagrant and I try to start a machine with. Check out Subway Surfer Cheat for Unlimited Coins and Keys: Windows Phone. You may build it from sources, but this is usually not the best idea. Question: I want to install CentOS desktop on VPS, and be able to access the desktop GUI remotely from home. What is a recommended way to set up and access CentOS. Create a gaming virtual machine using VFIO PCI passthrough for KVM . QEMU's normal PCI passthrough leaves much to be desired whereas VFIO takes full advantage of IOMMU, has better device support and prevents multiple access to the same device (you can read more about it in Alex Williamson's presentation here). That said, VFIO it is relatively new and experimental technology for the purposes of passing through entire VGA cards to virtual machines. While myself and many others have had tremendous success, different hardware can produce different results and getting there may not always be straightforward. Likely, until Fedora 2. Linux kernel and QEMU; instructions for doing so will be provided in this tutorial. If you are purchasing hardware, it is also strongly recommended that you read over the KVM VGA- passthrough thread on Arch Forums to confirm that your intended hardware configuration has been reported to work by another user. Personally, the following hardware has worked wonderfully for me: Motherboard: Supermicro X1. SAE CPU: Xeon E3- 1. Audio: Onboard (Intel C2. HD audio) and AMD R9 2. X HDMIVideo: AMD Radeon R9 2. XNetwork: Intel I2. Gigabit. Anecdotal evidence suggests that for graphics passthrough, n. Vidia cards seem to fare better than AMD ones. However, success has been had on both sides on a variety of device models dating back several years. I have found that generally, problems are not inherent to the hardware but more a matter of adjusting you software stack (i. From my reading n. Vidia's Ge. Force 6xx/7xx and AMD's Radeon R9 series seem to work fairly painlessly. For network cards, always pass through an Intel ethernet controller over a Realtek one if possible. Common problems with VGA VFIO passthrough. Terminator is a terminal emulator program that lets you use multiple splited and resized Linux terminals, all at once on a single screen. YUMI can create a Bootable UFD containing the following — Debian Live 32/64 Bit — Debian Live — Fedora 32/64 Bit — Fedora — Linux Mint 32/64 Bit —. I am trying to open Firefox in CentOS, but I'm getting the following message: Firefox is already running but is not responding and Firefox doesn't open. This part of the Fedora 20 home server setup howtos will show you how to create a gaming KVM virtual machine by passing through real hardware using the new VFIO PCI. Before getting to the fun part, there are several key pieces to getting a functioning VGA passthrough that need further description. Understanding these issues will be key in creating a functioning host environment for VFIO VGA passthrough. PCIe device reset. In order to re- initialize a PCIe device, it needs to be reset. Normally the host controls this, however now that we are passing through the device to a VM, some additional work is required to get reset functioning correctly. Without this extra PCIe reset support, the machine typically freezes when starting your VM for a second time. Fortunately for us, kernel > = 3.
VGA arbiter and multiple GPUs. Passing through generic PCI devices with VFIO works pretty well. Graphics card passthrough gets put into its own category called . This will be a major headache when trying to setup VGA passthrough, as VGA is a really old standard. Back when it was created, having multiple graphics cards on a single system was not a configuration they had foreseen or designed for. VGA calls can only be directed to a single device at a time, so the kernel has to use a VGA arbiter that switches the active device and directs VGA accesses to the appropriate card. I am oversimplifying this a bit, but Alex Williamson has a detailed post explaining the technical issues. In short, the x- vga=on flag passed to VFIO indicates to the VGA arbiter that the VFIO driver will need to participate in VGA arbitration, so everyone stays happy. The problem is that the Xorg i. Intel's integrated GPUs does not participate in VGA arbitration, even though the devices claim the VGA address space. This means VGA calls get directed to the wrong card, (a) messing up your display on the host and (b) preventing the graphics card on the VM from functioning correctly. Ugh. Fortunately, Alex has also written kernel patches to fix this, however be warned that they cripple 3. D performance on the Intel GPU. Since we're building a high- performance VM for gaming, I am assuming that will not be an issue for you. Kernel patches: No. Snoop. No. Snoop is a feature flag on a PCIe device that allows it to issue transitions that to bypass cache. ![]() This can cause consistency problems when passing through the card to a virtual machine. You can check if you card has No. Snoop enabled by running lspci - vvvvas root and seeing if your graphics card lists No. Snoop+ (enabled) or No. Snoop- (disabled) under the Capabilities > Dev. Ctl section. Previously this required patches to the kernel, but with kernel 3. Fedora, these patches are no longer required. Rebuilding packages. The first step is to setup a packaging environment and download the upstream source RPMS: yum install fedora- packager yum- utilsrpmdev- setuptreecd ~/rpmbuild/SRPMSyumdownloader - -source kernelrpm - i kernel*. It should have downloaded kernel- ! No rebuilding necessary. If you previously followed this guide, remove any QEMU exclusions from yum. Rebuilding Kernel. Download any required patches and save them as plaintext files in your ~/rpmbuild/SOURCES folder. Next, add your Patch. XYZ: filename. patch lines where you see other patches being declared. For example: Next, edit ~/rpmbuild/SPECS/kernel. You should see something like this. The result could be something like. That would look something like. If so, install them with yum install foo and then run the rpmbuild command again. When the build is complete, it output a list of filenames that you can install. Here's a quick command to do so: yum reinstall ~/rpmbuild/RPMS/$(uname - m)/kernel- ! I suggest you add a line exclude=kernel* to /etc/yum. Installing KVMBecause this is all experimental stuff, install fedora- virt- preview to get the latest and greatest software set: wget http: //fedorapeople. O /etc/yum. repos. Next, let's be nice to the VMs and give them some time to perform a graceful shutdown before the host powers off: sed - i 's/#ON. It allows the VFIO driver to later bind to the devices and pass them to a VM. This will include devices stubbed on boot and possibly others: cat < < EOF > /etc/sysconfig/vfio- bind. DEVICES=. You can use lspci - nn to identify a device, and then the output from the file listing to identify its full prefix. Here's an example of my configuration: DEVICES=. In /etc/libvirt/qemu. List all available VFIO groups like this: ls - 1 /dev/vfio. For ever number that appears, ensure its full path appears in the cgroup. For example, mine looks like so: cgroup! The last step is to actually create your virtual machine. The following snippet creates a sample reference file in your home directory: cat < < EOF > ~/gaming- vm- sample. YOUR. A plain image file on your disk can be created with qemu- img or just point it to an unformatted partition (preferred for better performance - it can be a physical partition or a logical RAID/LVM one). As well, be sure to specify the correct GPU. If you only want to pass through a GPU, then remove the - device and vfio- pci parameters for the other devices. When you have fully customized the file, import it: virsh define ~/gaming- vm- sample. You may wish to open virt- manager and copy the host CPU features if you're not running a Haswell CPU. Another tip is for Windows, you will need to download the latest Virt. IO driver image and attach it to the machine in order for Windows to detect a disk. This exposes the graphics card on a different PCIe port in the VM which may sometimes help. For n. Vidia users, recent driver packages apparently are broken without the kvm=off flag to the QEMU's - cpu parameter. Apparently, n. Vidia checks for the KVM hypervisor's signature and disables their driver if it detects it. It is not clear if this was an intentional change or not, but this is the reality of it. Be sure to read through the KVM thread on Arch Linux forums that's been linked throughout this howto, as it contains tons of valuable (albeit sparse) information. Another tip would be to get in touch with the fedora- virt mailing list and describe the issue.
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