From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
Add reset handler which gets host value of PMCEID0 or PMCEID1. Since
write action to PMCEID0 or PMCEID1 is ignored, add a new case for this.
Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
arch/arm64/kvm/sys_regs.c | 29 +++++++++++++++++++++++++----
1 file changed, 25 insertions(+), 4 deletions(-)
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 1f1f6a6..b0a8d88 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -460,6 +460,19 @@ static void reset_pmcr(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
vcpu_sys_reg(vcpu, r->reg) = val;
}
+static void reset_pmceid(struct kvm_vcpu *vcpu, const struct sys_reg_desc *r)
+{
+ u64 pmceid;
+
+ if (r->reg == PMCEID0_EL0)
+ asm volatile("mrs %0, pmceid0_el0\n" : "=r" (pmceid));
+ else
+ /* PMCEID1_EL0 */
+ asm volatile("mrs %0, pmceid1_el0\n" : "=r" (pmceid));
+
+ vcpu_sys_reg(vcpu, r->reg) = pmceid;
+}
+
/* PMU registers accessor. */
static bool access_pmu_regs(struct kvm_vcpu *vcpu,
const struct sys_reg_params *p,
@@ -477,6 +490,9 @@ static bool access_pmu_regs(struct kvm_vcpu *vcpu,
vcpu_sys_reg(vcpu, r->reg) = val;
break;
}
+ case PMCEID0_EL0:
+ case PMCEID1_EL0:
+ return ignore_write(vcpu, p);
default:
vcpu_sys_reg(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt);
break;
@@ -701,10 +717,10 @@ static const struct sys_reg_desc sys_reg_descs[] = {
access_pmu_regs, reset_unknown, PMSELR_EL0 },
/* PMCEID0_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110),
- trap_raz_wi },
+ access_pmu_regs, reset_pmceid, PMCEID0_EL0 },
/* PMCEID1_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111),
- trap_raz_wi },
+ access_pmu_regs, reset_pmceid, PMCEID1_EL0 },
/* PMCCNTR_EL0 */
{ Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000),
trap_raz_wi },
@@ -934,6 +950,9 @@ static bool access_pmu_cp15_regs(struct kvm_vcpu *vcpu,
vcpu_cp15(vcpu, r->reg) = val;
break;
}
+ case c9_PMCEID0:
+ case c9_PMCEID1:
+ return ignore_write(vcpu, p);
default:
vcpu_cp15(vcpu, r->reg) = *vcpu_reg(vcpu, p->Rt);
break;
@@ -991,8 +1010,10 @@ static const struct sys_reg_desc cp15_regs[] = {
{ Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi },
{ Op1( 0), CRn( 9), CRm(12), Op2( 5), access_pmu_cp15_regs,
NULL, c9_PMSELR },
- { Op1( 0), CRn( 9), CRm(12), Op2( 6), trap_raz_wi },
- { Op1( 0), CRn( 9), CRm(12), Op2( 7), trap_raz_wi },
+ { Op1( 0), CRn( 9), CRm(12), Op2( 6), access_pmu_cp15_regs,
+ NULL, c9_PMCEID0 },
+ { Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmu_cp15_regs,
+ NULL, c9_PMCEID1 },
{ Op1( 0), CRn( 9), CRm(13), Op2( 0), trap_raz_wi },
{ Op1( 0), CRn( 9), CRm(13), Op2( 1), trap_raz_wi },
{ Op1( 0), CRn( 9), CRm(13), Op2( 2), trap_raz_wi },
--
2.0.4
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