[PATCH 05/18] KVM: ARM64: Add reset and access handlers for PMSELR_EL0 register

[shannon.zhao at linaro.org]

From: Shannon Zhao <shannon.zhao at linaro.org>

Since the reset value of PMSELR_EL0 is UNKNOWN, use reset_unknown for
its reset handler. Add access handler which emulates writing and reading
PMSELR_EL0 register.

Signed-off-by: Shannon Zhao <shannon.zhao at linaro.org>
---
 arch/arm64/kvm/sys_regs.c | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 152ee17..69c8c48 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -275,6 +275,30 @@ static bool access_pmcr(struct kvm_vcpu *vcpu,
 	return true;
 }
 
+/* PMSELR_EL0 accessor. */
+static bool access_pmselr(struct kvm_vcpu *vcpu,
+			  const struct sys_reg_params *p,
+			  const struct sys_reg_desc *r)
+{
+	unsigned long val;
+
+	if (p->is_write) {
+		val = *vcpu_reg(vcpu, p->Rt);
+		if (!p->is_aarch32)
+			vcpu_sys_reg(vcpu, r->reg) = val;
+		else
+			vcpu_cp15(vcpu, r->reg) = val & 0xffffffffUL;
+	} else {
+		if (!p->is_aarch32)
+			val = vcpu_sys_reg(vcpu, r->reg);
+		else
+			val = vcpu_cp15(vcpu, r->reg);
+		*vcpu_reg(vcpu, p->Rt) = val;
+	}
+
+	return true;
+}
+
 /* Silly macro to expand the DBG{BCR,BVR,WVR,WCR}n_EL1 registers in one go */
 #define DBG_BCR_BVR_WCR_WVR_EL1(n)					\
 	/* DBGBVRn_EL1 */						\
@@ -481,7 +505,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	  trap_raz_wi },
 	/* PMSELR_EL0 */
 	{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b101),
-	  trap_raz_wi },
+	  access_pmselr, reset_unknown, PMSELR_EL0 },
 	/* PMCEID0_EL0 */
 	{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110),
 	  trap_raz_wi },
-- 
2.1.0