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KVM: arm64: Simplify warning in kvm_arch_vcpu_load_fp()

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At the end of kvm_arch_vcpu_load_fp() we check that no bits are set in
SVCR. We only check this for protected mode despite this mattering
equally for non-protected mode, and the comment above this is confusing.

Remove the comment and simplify the check, moving from WARN_ON() to
WARN_ON_ONCE() to avoid spamming the log.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Mark Rutland 2025-02-13 09:15:31 +00:00 committed by Marc Zyngier
parent 59419f1004
commit 332b7e6d62
1 changed files with 1 additions and 6 deletions
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7
arch/arm64/kvm/fpsimd.c
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@ -65,12 +65,7 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu)
fpsimd_save_and_flush_cpu_state();
*host_data_ptr(fp_owner) = FP_STATE_FREE;
/*
* If normal guests gain SME support, maintain this behavior for pKVM
* guests, which don't support SME.
*/
WARN_ON(is_protected_kvm_enabled() && system_supports_sme() &&
read_sysreg_s(SYS_SVCR));
WARN_ON_ONCE(system_supports_sme() && read_sysreg_s(SYS_SVCR));
}
/*