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UEFI instance controller recommendations #655

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UEFI instance controller recommendations #655

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16 changes: 16 additions & 0 deletions source/adminguide/virtual_machines.rst
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Expand Up @@ -1191,6 +1191,22 @@ UEFI setting
- On KVM, it is recommended to set boot type to UEFI, and boot mode to SECURE.
- UEFI is required for some Windows versions.

.. note::

**Recommendations for UEFI-based instances on KVM (volumes and NICs)**

UEFI-based instances on KVM may encounter PCI slot exhaustion when attaching additional
volumes or network interfaces, due to high PCI device usage from the default
disk bus and NIC adapter selections. To avoid these issues:

- **Disk bus**: For Linux-based UEFI guests, it is recommended to use **SCSI** as
the guest disk bus instead of VIRTIO. This reduces PCI device usage and improves
support for attaching additional volumes.
- **NIC adapter**: Set the NIC adapter type to **e1000** for UEFI instances to avoid
NIC attachment issues caused by PCI slot exhaustion.

Both of these settings can be configured in the **VM Settings** for an instance.

|vm-settings-virtual-tpm-model-kvm.png|
TPM model for KVM. There are two options:

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