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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>
This commit is contained in:
Mark Brown 2025-09-18 20:42:06 +01:00 committed by Marc Zyngier
parent 557c82a448
commit 5d20605c8e
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/kvm/sys_regs.c
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@ -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),