[RFC v3 05/12] kvm: arm64: Make ID_AA64DFR0_EL1 configurable

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Except that each ID field should be not greater than that of host,
PMUVer must be 0b0100 (PMUv3 for Armv8.1).

Signed-off-by: zhanghailiang <zhang.zhanghailiang@xxxxxxxxxx>
Signed-off-by: Peng Liang <liangpeng10@xxxxxxxxxx>
---
 arch/arm64/kvm/sys_regs.c | 28 +++++++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index bcc57cbe0421..3954b7a21a4b 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1367,6 +1367,32 @@ static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
 	return 0;
 }
 
+static int set_id_aa64dfr0_el1(struct kvm_vcpu *vcpu,
+		const struct sys_reg_desc *rd,
+		const struct kvm_one_reg *reg, void __user *uaddr)
+{
+	u32 reg_id = sys_reg((u32)rd->Op0, (u32)rd->Op1, (u32)rd->CRn,
+			     (u32)rd->CRm, (u32)rd->Op2);
+	int err;
+	u64 val;
+
+	err = reg_from_user(&val, uaddr, sys_reg_to_index(rd));
+	if (err)
+		return err;
+
+	err = check_features(reg_id, val);
+	if (err)
+		return err;
+
+	/* Limit guests to PMUv3 for ARMv8.1 */
+	if (cpuid_feature_extract_signed_field(val, ID_AA64DFR0_PMUVER_SHIFT) !=
+	    ID_AA64DFR0_PMUVER_8_1)
+		return -EINVAL;
+
+	__vcpu_sys_reg(vcpu, ID_REG_INDEX(reg_id)) = val;
+	return 0;
+}
+
 static bool access_ctr(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 		       const struct sys_reg_desc *r)
 {
@@ -1571,7 +1597,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
 	ID_UNALLOCATED(4,7),
 
 	/* CRm=5 */
-	ID_SANITISED(ID_AA64DFR0_EL1),
+	{ SYS_DESC(SYS_ID_AA64DFR0_EL1), access_id_reg, .get_user = get_id_reg, .set_user = set_id_aa64dfr0_el1 },
 	ID_SANITISED(ID_AA64DFR1_EL1),
 	ID_UNALLOCATED(5,2),
 	ID_UNALLOCATED(5,3),
-- 
2.26.2

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