[PATCH v2 2/4] KVM: arm64: Drop unnecessary masking of PMU registers

[Marc Zyngier]

We always sanitise our PMU sysreg on the write side, so there
is no need to do it on the read side as well.

Drop the unnecessary masking.

Acked-by: Russell King (Oracle) <rmk+kernel at armlinux.org.uk>
Reviewed-by: Alexandre Chartre <alexandre.chartre at oracle.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei at arm.com>
Signed-off-by: Marc Zyngier <maz at kernel.org>
---
 arch/arm64/kvm/pmu-emul.c | 3 +--
 arch/arm64/kvm/sys_regs.c | 6 +++---
 2 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/arch/arm64/kvm/pmu-emul.c b/arch/arm64/kvm/pmu-emul.c
index f33825c995cb..fae4e95b586c 100644
--- a/arch/arm64/kvm/pmu-emul.c
+++ b/arch/arm64/kvm/pmu-emul.c
@@ -373,7 +373,6 @@ static u64 kvm_pmu_overflow_status(struct kvm_vcpu *vcpu)
 		reg = __vcpu_sys_reg(vcpu, PMOVSSET_EL0);
 		reg &= __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
 		reg &= __vcpu_sys_reg(vcpu, PMINTENSET_EL1);
-		reg &= kvm_pmu_valid_counter_mask(vcpu);
 	}
 
 	return reg;
@@ -569,7 +568,7 @@ void kvm_pmu_handle_pmcr(struct kvm_vcpu *vcpu, u64 val)
 
 	if (val & ARMV8_PMU_PMCR_E) {
 		kvm_pmu_enable_counter_mask(vcpu,
-		       __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask);
+		       __vcpu_sys_reg(vcpu, PMCNTENSET_EL0));
 	} else {
 		kvm_pmu_disable_counter_mask(vcpu, mask);
 	}
diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 96bdfa0e68b2..f22139658e48 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -880,7 +880,7 @@ static bool access_pmcnten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 			kvm_pmu_disable_counter_mask(vcpu, val);
 		}
 	} else {
-		p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0) & mask;
+		p->regval = __vcpu_sys_reg(vcpu, PMCNTENSET_EL0);
 	}
 
 	return true;
@@ -904,7 +904,7 @@ static bool access_pminten(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 			/* accessing PMINTENCLR_EL1 */
 			__vcpu_sys_reg(vcpu, PMINTENSET_EL1) &= ~val;
 	} else {
-		p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1) & mask;
+		p->regval = __vcpu_sys_reg(vcpu, PMINTENSET_EL1);
 	}
 
 	return true;
@@ -926,7 +926,7 @@ static bool access_pmovs(struct kvm_vcpu *vcpu, struct sys_reg_params *p,
 			/* accessing PMOVSCLR_EL0 */
 			__vcpu_sys_reg(vcpu, PMOVSSET_EL0) &= ~(p->regval & mask);
 	} else {
-		p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0) & mask;
+		p->regval = __vcpu_sys_reg(vcpu, PMOVSSET_EL0);
 	}
 
 	return true;
-- 
2.30.2