[PATCH v7 06/19] KVM: ARM64: Add access handler for PMCEID0 and PMCEID1 register

[Shannon Zhao]

From: Shannon Zhao <shannon.z...@linaro.org>

Add access handler which gets host value of PMCEID0 or PMCEID1 when
guest access these registers. Writing action to PMCEID0 or PMCEID1 is
ignored.

Signed-off-by: Shannon Zhao <shannon.z...@linaro.org>
---
 arch/arm64/kvm/sys_regs.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index c21f91b..e043224 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -486,6 +486,24 @@ static bool access_pmselr(struct kvm_vcpu *vcpu, struct 
sys_reg_params *p,
        return true;
 }
 
+static bool access_pmceid(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
+                         const struct sys_reg_desc *r)
+{
+       u64 pmceid;
+
+       if (p->is_write)
+               return write_to_read_only(vcpu, p);
+
+       if (!(p->Op2 & 1))
+               asm volatile("mrs %0, pmceid0_el0\n" : "=r" (pmceid));
+       else
+               asm volatile("mrs %0, pmceid1_el0\n" : "=r" (pmceid));
+
+       p->regval = pmceid;
+
+       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 */                                               \
@@ -688,10 +706,10 @@ static const struct sys_reg_desc sys_reg_descs[] = {
          access_pmselr, reset_unknown, PMSELR_EL0 },
        /* PMCEID0_EL0 */
        { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b110),
-         trap_raz_wi },
+         access_pmceid },
        /* PMCEID1_EL0 */
        { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1100), Op2(0b111),
-         trap_raz_wi },
+         access_pmceid },
        /* PMCCNTR_EL0 */
        { Op0(0b11), Op1(0b011), CRn(0b1001), CRm(0b1101), Op2(0b000),
          trap_raz_wi },
@@ -937,8 +955,8 @@ static const struct sys_reg_desc cp15_regs[] = {
        { Op1( 0), CRn( 9), CRm(12), Op2( 2), trap_raz_wi },
        { Op1( 0), CRn( 9), CRm(12), Op2( 3), trap_raz_wi },
        { Op1( 0), CRn( 9), CRm(12), Op2( 5), access_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_pmceid },
+       { Op1( 0), CRn( 9), CRm(12), Op2( 7), access_pmceid },
        { 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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