KVM: arm64: Expose FEAT_LSFE to guests

FEAT_LSFE (Large System Float Extension), providing atomic floating point
memory operations, is optional from v9.5. This feature adds no new
architectural state, expose the relevant ID register field to guests so
they can discover it.

Signed-off-by: Mark Brown <broonie@kernel.org>
Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index d1a55cf589b7e77e69a7aab27a0204e030a3ef84..1099b815cd61c9dabab2b047fdc97ff70b91855b 100644 (file)
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1642,7 +1642,8 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
                        val &= ~ARM64_FEATURE_MASK(ID_AA64ISAR2_EL1_WFxT);
                break;
        case SYS_ID_AA64ISAR3_EL1:
-               val &= ID_AA64ISAR3_EL1_FPRCVT | ID_AA64ISAR3_EL1_FAMINMAX;
+               val &= ID_AA64ISAR3_EL1_FPRCVT | ID_AA64ISAR3_EL1_LSFE |
+                       ID_AA64ISAR3_EL1_FAMINMAX;
                break;
        case SYS_ID_AA64MMFR2_EL1:
                val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
@@ -2991,6 +2992,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
                                        ID_AA64ISAR2_EL1_APA3 |
                                        ID_AA64ISAR2_EL1_GPA3)),
        ID_WRITABLE(ID_AA64ISAR3_EL1, (ID_AA64ISAR3_EL1_FPRCVT |
+                                      ID_AA64ISAR3_EL1_LSFE |
                                       ID_AA64ISAR3_EL1_FAMINMAX)),
        ID_UNALLOCATED(6,4),
        ID_UNALLOCATED(6,5),