KVM: arm64: Handle RASv1p1 registers

FEAT_RASv1p1 system registeres are not handled at all so far.
KVM will give an embarassed warning on the console and inject
an UNDEF, despite RASv1p1 being exposed to the guest on suitable HW.

Handle these registers similarly to FEAT_RAS, with the added fun
that there are *two* way to indicate the presence of FEAT_RASv1p1.

Reviewed-by: Joey Gouly <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Cornelia Huck <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Oliver Upton <[email protected]>

Author: Marc Zyngier

arch/arm64/kvm/sys_regs.c

@@ -2695,6 +2695,18 @@ static bool access_ras(struct kvm_vcpu *vcpu,
 	struct kvm *kvm = vcpu->kvm;
 
 	switch(reg_to_encoding(r)) {
+	case SYS_ERXPFGCDN_EL1:
+	case SYS_ERXPFGCTL_EL1:
+	case SYS_ERXPFGF_EL1:
+	case SYS_ERXMISC2_EL1:
+	case SYS_ERXMISC3_EL1:
+		if (!(kvm_has_feat(kvm, ID_AA64PFR0_EL1, RAS, V1P1) ||
+		      (kvm_has_feat_enum(kvm, ID_AA64PFR0_EL1, RAS, IMP) &&
+		       kvm_has_feat(kvm, ID_AA64PFR1_EL1, RAS_frac, RASv1p1)))) {
+			kvm_inject_undefined(vcpu);
+			return false;
+		}
+		break;
 	default:
 		if (!kvm_has_feat(kvm, ID_AA64PFR0_EL1, RAS, IMP)) {
 			kvm_inject_undefined(vcpu);
@@ -3058,8 +3070,13 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	{ SYS_DESC(SYS_ERXCTLR_EL1), access_ras },
 	{ SYS_DESC(SYS_ERXSTATUS_EL1), access_ras },
 	{ SYS_DESC(SYS_ERXADDR_EL1), access_ras },
+	{ SYS_DESC(SYS_ERXPFGF_EL1), access_ras },
+	{ SYS_DESC(SYS_ERXPFGCTL_EL1), access_ras },
+	{ SYS_DESC(SYS_ERXPFGCDN_EL1), access_ras },
 	{ SYS_DESC(SYS_ERXMISC0_EL1), access_ras },
 	{ SYS_DESC(SYS_ERXMISC1_EL1), access_ras },
+	{ SYS_DESC(SYS_ERXMISC2_EL1), access_ras },
+	{ SYS_DESC(SYS_ERXMISC3_EL1), access_ras },
 
 	MTE_REG(TFSR_EL1),
 	MTE_REG(TFSRE0_EL1),