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Enable Xen PVH in Kernel #115182

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clerie opened this issue Mar 5, 2021 · 0 comments
Closed

Enable Xen PVH in Kernel #115182

clerie opened this issue Mar 5, 2021 · 0 comments
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6.topic: kernel The Linux kernel 6.topic: xen-project The Xen Project hypervisor

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@clerie
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clerie commented Mar 5, 2021 •
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To optimize NixOS for running a bit tidier as a Xen guest, it would be nice to activate PVH.

Something like this should be enabled in the kernel config:

CONFIG_HYPERVISOR_GUEST=y
CONFIG_PARAVIRT=y
CONFIG_PARAVIRT_GUEST=y
CONFIG_PARAVIRT_SPINLOCKS=y
CONFIG_XEN=y
CONFIG_XEN_PVHVM=y
CONFIG_XEN_PVHVM_SMP=y
CONFIG_XEN_PVH=y

See https://wiki.xenproject.org/wiki/Linux_PVH
@veprbl veprbl added the 6.topic: kernel The Linux kernel label Mar 5, 2021
@alyssais alyssais mentioned this issue Apr 1, 2021
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alyssais added a commit to alyssais/nixpkgs that referenced this issue Apr 4, 2021
@alyssais
linux: enable Xen everywhere it can be
a5aa936 
I don't think there's any reason to have a seperate kernel variant
because of this, with all the maintenance burden that imposes.  Debian
and Fedora both enable all these options on their normal kernels.

Alias the Linux Xen attributes, so this change should be seemless for
people who were using the Xen kernels up to now.

All the Xen options are marked as optional anyway, so it should be
fine to try to enable them on non-x86 platforms as well.

Fixes: NixOS#115182
@FRidh FRidh closed this as completed in 5f24024 Apr 25, 2021
@SigmaSquadron SigmaSquadron added the 6.topic: xen-project The Xen Project hypervisor label Sep 25, 2024
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6.topic: kernel The Linux kernel 6.topic: xen-project The Xen Project hypervisor
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@veprbl @clerie @SigmaSquadron