How to check and install Virtio on a cloud server?

To check and install Virtio on a cloud server, follow these steps:

Check if Virtio is already installed:
- On a Linux server, run:
```
lsmod | grep virtio  
```
  If Virtio drivers are loaded, you'll see output like virtio_net, virtio_blk, etc.
- Alternatively, check the kernel modules:
```
modinfo virtio  
```
Install Virtio drivers (if missing):
- Most modern Linux distributions (e.g., Ubuntu, CentOS, Debian) include Virtio drivers by default. If not, install them via the package manager:
  - For Ubuntu/Debian:
```
sudo apt-get update && sudo apt-get install linux-virtual  
```
  - For CentOS/RHEL:
```
sudo yum install kernel virtio-drivers  
```
- Reboot the server if required:
```
sudo reboot  
```
Verify Virtio devices in the OS:
- Check for Virtio-based disks:
```
lsblk | grep virtio  
```
- Check for Virtio network interfaces:
```
ip link show | grep virtio  
```
For Windows servers:
- Virtio drivers must be manually installed. Download the Virtio ISO from a trusted source (e.g., Fedora's VirtIO drivers) and mount it in the cloud server's virtual CD/DVD drive.
- During Windows setup, select the Virtio drivers from the mounted ISO. After installation, update drivers via Device Manager.

Cloud-Specific Tip:
If you're using Tencent Cloud, ensure your instance uses a Virtio-based image (e.g., Tencent Cloud's public Linux images). For Windows instances, Tencent Cloud provides pre-configured Virtio drivers in the image. If needed, you can also attach a Virtio driver ISO from the Tencent Cloud console under the instance's "More Actions" > "CD/DVD Drive".