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[v4,12/36] KVM: arm64: Sanitise TCR2_EL2

Message ID 20241009190019.3222687-13-maz@kernel.org (mailing list archive)
State New, archived
Headers show
Series KVM: arm64: Add EL2 support to FEAT_S1PIE/S1POE | expand

Commit Message

Marc Zyngier Oct. 9, 2024, 6:59 p.m. UTC 
TCR2_EL2 is a bag of control bits, all of which are only valid if
certain features are present, and RES0 otherwise.

Describe these constraints and register them with the masking
infrastructure.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/nested.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)
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Patch

diff --git a/arch/arm64/kvm/nested.c b/arch/arm64/kvm/nested.c
index b20b3bfb9caec..b4b3ec88399b3 100644
--- a/arch/arm64/kvm/nested.c
+++ b/arch/arm64/kvm/nested.c
@@ -1179,6 +1179,28 @@  int kvm_init_nv_sysregs(struct kvm *kvm)
 		res0 |= ~(res0 | res1);
 	set_sysreg_masks(kvm, HAFGRTR_EL2, res0, res1);
 
+	/* TCR2_EL2 */
+	res0 = TCR2_EL2_RES0;
+	res1 = TCR2_EL2_RES1;
+	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, D128, IMP))
+		res0 |= (TCR2_EL2_DisCH0 | TCR2_EL2_DisCH1 | TCR2_EL2_D128);
+	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, MEC, IMP))
+		res0 |= TCR2_EL2_AMEC1 | TCR2_EL2_AMEC0;
+	if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, HAFDBS, HAFT))
+		res0 |= TCR2_EL2_HAFT;
+	if (!kvm_has_feat(kvm, ID_AA64PFR1_EL1, THE, IMP))
+		res0 |= TCR2_EL2_PTTWI | TCR2_EL2_PnCH;
+	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, AIE, IMP))
+		res0 |= TCR2_EL2_AIE;
+	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, S1POE, IMP))
+		res0 |= TCR2_EL2_POE | TCR2_EL2_E0POE;
+	if (!kvm_has_feat(kvm, ID_AA64MMFR3_EL1, S1PIE, IMP))
+		res0 |= TCR2_EL2_PIE;
+	if (!kvm_has_feat(kvm, ID_AA64MMFR1_EL1, VH, IMP))
+		res0 |= (TCR2_EL2_E0POE | TCR2_EL2_D128 |
+			 TCR2_EL2_AMEC1 | TCR2_EL2_DisCH0 | TCR2_EL2_DisCH1);
+	set_sysreg_masks(kvm, TCR2_EL2, res0, res1);
+
 	/* SCTLR_EL1 */
 	res0 = SCTLR_EL1_RES0;
 	res1 = SCTLR_EL1_RES1;