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
