Jan 12 22:20:12 unraid kernel 0x0, gso_size 1192, hdr_len 1258 jan 12 22:20:12 unraid kernel 00 00 00 00 00 00 00 00 00 00 0. The virtio specification aimed to address this issue by providing a standardized interface for virtual devices, allowing virtual machines to communicate with emulated devices in a consistent manner across different hypervisors By doing so, virtio sought to improve compatibility, efficiency, and performance in virtualized environments. Virtio on linux ¶ introduction ¶ virtio is an open standard that defines a protocol for communication between drivers and devices of different types, see chapter 5 (“device types”) of the virtio spec ([1])
Originally developed as a standard for paravirtualized devices implemented by a hypervisor, it can be used to interface any compliant device (real or emulated) with a driver Components of virtio virtio mainly consists of the following components A queue built in shared memory between the host and guest for performing data input and output Apart from that i see, hw/net/vhost_net.c but didn't understand under what scenario this has been used ? Virtio is a virtualization standard for network and disk device drivers where just the guest's device driver knows it is running in a virtual environment, and cooperates with the hypervisor This enables guests to get high performance network and disk operations, and gives most of the performance benefits of paravirtualization.
Accessing devices through virtio on a guest vm improves performance over more traditional emulated devices, as virtio devices require only the bare minimum setup and configuration needed to send and receive data, while the host machine. A virtual nic using the virtio specification Emulates a generic usb nic These network devices offer different network connectivity options for the guest machine. The virtio_net_f_guest_csum feature indicates that partially checksummed packets can be received, and if it can do that then the virtio_net_f_guest_tso4, virtio_net_f_guest_tso6, virtio_net_f_guest_ufo and virtio_net_f_guest_ecn are the input equivalents of the features described above. We have a separate control plane and data plane between backend and frontend
Virtual i/o devices, or virtio for short, are virtualized devices that are known to be virtualized devices Usually, a virtual machine will emulate real hardware, so the registers and setup are the same for actual hardware versus emulated hardware. The linux kernel supports a variety of virtualization schemes, and that\\'s likely to grow as virtualization advances and new schemes are discovered (for example, lguest) But with all these virtualization schemes running on top of linux, how do they exploit the underlying kernel for i/o virtualization The answer is virtio, which provides an efficient abstraction for hypervisors and a common. The devices are the same but the difference is discovery
The pci device will be discovered by enumerating the emulated pci device Once the kernel has started up and discovered the hardware it has it will then spawn the correct driver with the device. Virtio allows vms to bypass full device emulation and use streamlined drivers Virtio is most commonly used with kvm/qemu virtualization Virtual i/o (virtio) overview virtual i/o (virtio) is a protocol used for communication with various devices, typically used in virtualized environments Its main goal is to provide an efficient and standardized mechanism for interfacing with virtual devices from within a virtual machine
The communication relies on virtqueues and standard transfer methods like pci or mmio The most common types are For block devices (like hard disks) A more advanced standard for storage devices For memory management (allowing the host to reclaim memory from the guest) The attempt to address this is virtio
We did some experiment trying to measure network performance overhead in virtualization environment, comparing between vfio passthrough and virtio approaches.
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