[v5,10/30] KVM: arm64: Sanitise ID_AA64MMFR3_EL1

Commit Message

Joey Gouly Aug. 22, 2024, 3:10 p.m. UTC

Add the missing sanitisation of ID_AA64MMFR3_EL1, making sure we
solely expose S1POE and TCRX (we currently don't support anything
else).

[joey: Took Marc's patch for S1PIE, and changed it for S1POE]

Signed-off-by: Marc Zyngier <[e-mail]>
Signed-off-by: Joey Gouly <[e-mail]>
---
 arch/arm64/kvm/sys_regs.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

Patch

diff --git arch/arm64/kvm/sys_regs.c arch/arm64/kvm/sys_regs.c
index e7208b59ea12..0f13378e761c 100644
--- arch/arm64/kvm/sys_regs.c
+++ arch/arm64/kvm/sys_regs.c
@@ -1556,6 +1556,9 @@  static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu,
 	case SYS_ID_AA64MMFR2_EL1:
 		val &= ~ID_AA64MMFR2_EL1_CCIDX_MASK;
 		break;
+	case SYS_ID_AA64MMFR3_EL1:
+		val &= ID_AA64MMFR3_EL1_TCRX | ID_AA64MMFR3_EL1_S1POE;
+		break;
 	case SYS_ID_MMFR4_EL1:
 		val &= ~ARM64_FEATURE_MASK(ID_MMFR4_EL1_CCIDX);
 		break;
@@ -2427,7 +2430,8 @@  static const struct sys_reg_desc sys_reg_descs[] = {
 					ID_AA64MMFR2_EL1_IDS |
 					ID_AA64MMFR2_EL1_NV |
 					ID_AA64MMFR2_EL1_CCIDX)),
-	ID_SANITISED(ID_AA64MMFR3_EL1),
+	ID_WRITABLE(ID_AA64MMFR3_EL1, (ID_AA64MMFR3_EL1_TCRX	|
+				       ID_AA64MMFR3_EL1_S1POE)),
 	ID_SANITISED(ID_AA64MMFR4_EL1),
 	ID_UNALLOCATED(7,5),
 	ID_UNALLOCATED(7,6),