KVM: arm64: Enable FP8 support when available and configured

Marc Zyngier · Marc Zyngier · commit c9150a8ad9cd · 2024-08-27T07:59:27.000+01:00
If userspace has enabled FP8 support (by setting ID_AA64PFR2_EL1.FPMR to 1), let's enable the feature by setting HCRX_EL2.EnFPM for the vcpu. Reviewed-by: Mark Brown <broonie@kernel.org> Tested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20240820131802.3547589-8-maz@kernel.org Signed-off-by: Marc Zyngier <maz@kernel.org>
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
@@ -4579,6 +4579,9 @@ void kvm_calculate_traps(struct kvm_vcpu *vcpu)
 
 		if (kvm_has_feat(kvm, ID_AA64MMFR3_EL1, TCRX, IMP))
 			vcpu->arch.hcrx_el2 |= HCRX_EL2_TCR2En;
+
+		if (kvm_has_fpmr(kvm))
+			vcpu->arch.hcrx_el2 |= HCRX_EL2_EnFPM;
 	}
 
 	if (test_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags))

Original file line number	Diff line number	Diff line change
`@@ -4579,6 +4579,9 @@ void kvm_calculate_traps(struct kvm_vcpu *vcpu)`
`4579`	`4579`
`4580`	`4580`	`if (kvm_has_feat(kvm, ID_AA64MMFR3_EL1, TCRX, IMP))`
`4581`	`4581`	`vcpu->arch.hcrx_el2 \|= HCRX_EL2_TCR2En;`
	`4582`	`+`
	`4583`	`+ if (kvm_has_fpmr(kvm))`
	`4584`	`+ vcpu->arch.hcrx_el2 \|= HCRX_EL2_EnFPM;`
`4582`	`4585`	`}`
`4583`	`4586`
`4584`	`4587`	`if (test_bit(KVM_ARCH_FLAG_FGU_INITIALIZED, &kvm->arch.flags))`