Except that each ID field should be not greater than that of host,
PerfMon 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 2ea165d09c7b..aac62f6fa846 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -1323,6 +1323,32 @@ static int set_raz_id_reg(struct kvm_vcpu *vcpu, const struct sys_reg_desc *rd,
return __set_id_reg(vcpu, rd, uaddr, true);
}
+static int set_id_dfr0_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_DFR0_PERFMON_SHIFT) !=
+ ID_DFR0_PERFMON_8_1)
+ return -EINVAL;
+
+ __vcpu_sys_reg(vcpu, ID_REG_INDEX(reg_id)) = val;
+ return 0;
+}
+
static int set_id_aa64pfr0_el1(struct kvm_vcpu *vcpu,
const struct sys_reg_desc *rd,
const struct kvm_one_reg *reg, void __user *uaddr)
@@ -1642,7 +1668,7 @@ static const struct sys_reg_desc sys_reg_descs[] = {
/* CRm=1 */
ID_SANITISED(ID_PFR0_EL1),
ID_SANITISED(ID_PFR1_EL1),
- ID_SANITISED(ID_DFR0_EL1),
+ { SYS_DESC(SYS_ID_DFR0_EL1), access_id_reg, .get_user = get_id_reg, .set_user = set_id_dfr0_el1 },
ID_HIDDEN(ID_AFR0_EL1),
ID_SANITISED(ID_MMFR0_EL1),
ID_SANITISED(ID_MMFR1_EL1),
--
2.26.2
