[LTP] tst_virt: Add fallback KVM detection via virtio block devices

[linuxtestproject.agent@gmail.com]

Hi Darren,

On 2026-05-02, Darren Chang wrote:
> tst_virt: Add fallback KVM detection via virtio block devices

> +       /* * Fallback check for KVM:
> +        * Android's ueventd creates block devices in /dev/block/
> +        * instead of the standard Linux /dev/, so we check both.
> +        */

Malformed comment block. The `/*` opener must be on its own line with no
text. Use:

	/*
	 * Fallback check for KVM:
	 * ...
	 */

> +       if (!found) {
> +               if (access("/dev/vda", F_OK) == 0 ||
> +                       access("/sys/block/vda", F_OK) == 0 ||
> +                       access("/dev/block/vda", F_OK) == 0) {
> +                       found = 1;
> +               }
> +       }

Virtio block devices are not KVM-exclusive. Hyper-V and VMware guests with
virtio drivers also expose /dev/vda, so this will produce false positives.
Either narrow the detection (e.g. check /sys/class/dmi/id/product_name for
QEMU/KVM) or explicitly document this as a best-effort heuristic.

---
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