[PATCH v2 2/4] KVM: arm64: Drop unnecessary masking of PMU registers
From: Marc Zyngier <maz@kernel.org>
Date: 2021-07-19 12:42:14
Also in:
kvmarm, linux-arm-kernel
Subsystem:
arm64 port (aarch64 architecture), kernel virtual machine for arm64 (kvm/arm64), the rest · Maintainers:
Catalin Marinas, Will Deacon, Marc Zyngier, Oliver Upton, Linus Torvalds
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) <redacted> Reviewed-by: Alexandre Chartre <redacted> Reviewed-by: Alexandru Elisei <redacted> Signed-off-by: Marc Zyngier <maz@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