33 lines
1.2 KiB
YAML
33 lines
1.2 KiB
YAML
---
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features:
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- |
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Some hypervisors add a signature to their guests, e.g. KVM is adding
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``KVMKVMKVM\0\0\0``, Xen: ``XenVMMXenVMM``.
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The existence of a hypervisor signature enables some paravirtualization
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features on the guest as well as disallowing certain drivers which test
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for the hypervisor to load e.g. Nvidia driver [1]:
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"The latest Nvidia driver (337.88) specifically checks
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for KVM as the hypervisor and reports Code 43 for the
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driver in a Windows guest when found. Removing or
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changing the KVM signature is sufficient for the driver
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to load and work."
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The new ``img_hide_hypervisor_id`` image metadata property hides the
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hypervisor signature for the guest.
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Currently only the libvirt compute driver can hide hypervisor signature
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for the guest host.
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To verify if hiding hypervisor id is working on Linux based system::
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$ cpuid | grep -i hypervisor_id
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The result should not be (for KVM hypervisor)::
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$ hypervisor_id = KVMKVMKVM\0\0\0
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You can enable this feature by setting the ``img_hide_hypervisor_id=true``
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property in a Glance image.
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[1]: http://git.qemu.org/?p=qemu.git;a=commitdiff;h=f522d2a
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