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One physical GPU split into virtual functions handed to separate Windows desktops

Licence-Free Windows VDI on Proxmox with an Intel Arc Pro B50 — and the Firmware Limit That Stopped It

Intel’s Arc Pro cards do SR-IOV natively, with no vGPU licence to buy — which makes a licence-free Windows VDI on Proxmox genuinely possible. The whole build on a B50, the Windows-first bootstrap problem, why the firmware caps it at two virtual functions, and how many each card in the B-series gives you.

7th August 2026 Â· 16 min Â· 3385 words Â· Damien Dye
A guest clock drifting away from the host clock, and a hypercall pulling it back

A VM's Clock Cannot Be Trusted — and the ptp_kvm Fix for QEMU/KVM

A virtual machine’s clock is built on an assumption virtualisation breaks: that the CPU keeps counting. Why guest time drifts on every hypervisor, what the skew actually breaks — Kerberos, TLS, Ceph, Windows — and how ptp_kvm fixes it properly on QEMU/KVM.

7th August 2026 Â· 14 min Â· 2897 words Â· Damien Dye