KVM: arm64: Optimise away S1POE handling when not supported by host

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Although ID register sanitisation prevents guests from seeing the
feature, adding this check to the helper allows the compiler to entirely
eliminate S1POE-specific code paths (such as context switching POR_EL1)
when the host kernel is compiled without support (CONFIG_ARM64_POE is
disabled).

This aligns with the pattern used for other optional features like SVE
(kvm_has_sve()) and FPMR (kvm_has_fpmr()), ensuring no POE logic if the
host lacks support, regardless of the guest configuration state.

Signed-off-by: Fuad Tabba <tabba@google.com>
Link: https://patch.msgid.link/20260213143815.1732675-3-tabba@google.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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Fuad Tabba 2026-02-13 14:38:13 +00:00 • committed by Marc Zyngier

parent f66857bafd

commit 9cb0468d0b

1 changed files with 2 additions and 1 deletions

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arch/arm64/include/asm/kvm_host.h

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