[v4,16/36] KVM: arm64: Handle PIR{,E0}_EL2 traps

Commit Message

Marc Zyngier Oct. 9, 2024, 6:59 p.m. UTC

Add the FEAT_S1PIE EL2 registers the sysreg descriptor array so that
they can be handled as a trap.

Access to these registers is conditional based on ID_AA64MMFR3_EL1.S1PIE
being advertised.

Similarly to other other changes, PIRE0_EL2 is guaranteed to trap
thanks to the D22677 update to the architecture.

Reviewed-by: Joey Gouly <[e-mail]>
Signed-off-by: Marc Zyngier <[e-mail]>
---
 arch/arm64/kvm/sys_regs.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Patch

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index a85f62baebfba..c42f09a67a7c9 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -369,6 +369,18 @@  static bool access_rw(struct kvm_vcpu *vcpu,
 	return true;
 }
 
+static bool check_s1pie_access_rw(struct kvm_vcpu *vcpu,
+				  struct sys_reg_params *p,
+				  const struct sys_reg_desc *r)
+{
+	if (!kvm_has_feat(vcpu->kvm, ID_AA64MMFR3_EL1, S1PIE, IMP)) {
+		kvm_inject_undefined(vcpu);
+		return false;
+	}
+
+	return access_rw(vcpu, p, r);
+}
+
 /*
  * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized).
  */
@@ -2873,6 +2885,8 @@  static const struct sys_reg_desc sys_reg_descs[] = {
 	EL2_REG(HPFAR_EL2, access_rw, reset_val, 0),
 
 	EL2_REG(MAIR_EL2, access_rw, reset_val, 0),
+	EL2_REG(PIRE0_EL2, check_s1pie_access_rw, reset_val, 0),
+	EL2_REG(PIR_EL2, check_s1pie_access_rw, reset_val, 0),
 	EL2_REG(AMAIR_EL2, access_rw, reset_val, 0),
 
 	EL2_REG(VBAR_EL2, access_rw, reset_val, 0),