Commit 4c181e3d authored by Mark Brown's avatar Mark Brown Committed by Marc Zyngier
Browse files

KVM: arm64: Document check for TIF_FOREIGN_FPSTATE 



In kvm_arch_vcpu_load_fp() we unconditionally set the current FP state
to FP_STATE_HOST_OWNED, this will be overridden to FP_STATE_NONE if
TIF_FOREIGN_FPSTATE is set but the check is deferred until
kvm_arch_vcpu_ctxflush_fp() where we are no longer preemptable. Add a
comment to this effect to help avoid people being concerned about the
lack of a check and discover where the check is done.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Signed-off-by: default avatarMarc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221214-kvm-arm64-sme-context-switch-v2-1-57ba0082e9ff@kernel.org
parent 3d179356

arch/arm64/kvm/fpsimd.c

+5 −0
Original line number Diff line number Diff line
@@ -81,6 +81,11 @@ void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) 


	fpsimd_kvm_prepare();



	/*

	 * We will check TIF_FOREIGN_FPSTATE just before entering the

	 * guest in kvm_arch_vcpu_ctxflush_fp() and override this to

	 * FP_STATE_FREE if the flag set.

	 */

	vcpu->arch.fp_state = FP_STATE_HOST_OWNED;



	vcpu_clear_flag(vcpu, HOST_SVE_ENABLED);