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From: Marc Zyngier <marc.zyngier@arm.com>
To: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
	kvmarm@lists.cs.columbia.edu
Cc: Shannon Zhao <shannon.zhao@linaro.org>
Subject: [PATCH v2 2/9] arm64: KVM: PMU: Inject UNDEF exception on illegal register access
Date: Mon, 27 Mar 2017 17:03:38 +0100	[thread overview]
Message-ID: <20170327160345.12402-3-marc.zyngier@arm.com> (raw)
In-Reply-To: <20170327160345.12402-1-marc.zyngier@arm.com>

Both pmu_*_el0_disabled() and pmu_counter_idx_valid() perform checks
on the validity of an access, but only return a boolean indicating
if the access is valid or not.

Let's allow these functions to also inject an UNDEF exception if
the access was illegal.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm64/kvm/sys_regs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7e1d673304d5..d98ce9a52291 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -465,6 +465,9 @@ static bool check_disabled(struct kvm_vcpu *vcpu, u64 flags)
 	u64 reg = vcpu_sys_reg(vcpu, PMUSERENR_EL0);
 	bool cond = (reg & flags) || vcpu_mode_priv(vcpu);
 
+	if (!cond)
+		kvm_inject_undefined(vcpu);
+
 	return !cond;
 }
 
@@ -564,8 +567,10 @@ static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx)
 
 	pmcr = vcpu_sys_reg(vcpu, PMCR_EL0);
 	val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK;
-	if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX)
+	if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) {
+		kvm_inject_undefined(vcpu);
 		return false;
+	}
 
 	return true;
 }
-- 
2.11.0

WARNING: multiple messages have this Message-ID (diff)
From: marc.zyngier@arm.com (Marc Zyngier)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 2/9] arm64: KVM: PMU: Inject UNDEF exception on illegal register access
Date: Mon, 27 Mar 2017 17:03:38 +0100	[thread overview]
Message-ID: <20170327160345.12402-3-marc.zyngier@arm.com> (raw)
In-Reply-To: <20170327160345.12402-1-marc.zyngier@arm.com>

Both pmu_*_el0_disabled() and pmu_counter_idx_valid() perform checks
on the validity of an access, but only return a boolean indicating
if the access is valid or not.

Let's allow these functions to also inject an UNDEF exception if
the access was illegal.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
 arch/arm64/kvm/sys_regs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c
index 7e1d673304d5..d98ce9a52291 100644
--- a/arch/arm64/kvm/sys_regs.c
+++ b/arch/arm64/kvm/sys_regs.c
@@ -465,6 +465,9 @@ static bool check_disabled(struct kvm_vcpu *vcpu, u64 flags)
 	u64 reg = vcpu_sys_reg(vcpu, PMUSERENR_EL0);
 	bool cond = (reg & flags) || vcpu_mode_priv(vcpu);
 
+	if (!cond)
+		kvm_inject_undefined(vcpu);
+
 	return !cond;
 }
 
@@ -564,8 +567,10 @@ static bool pmu_counter_idx_valid(struct kvm_vcpu *vcpu, u64 idx)
 
 	pmcr = vcpu_sys_reg(vcpu, PMCR_EL0);
 	val = (pmcr >> ARMV8_PMU_PMCR_N_SHIFT) & ARMV8_PMU_PMCR_N_MASK;
-	if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX)
+	if (idx >= val && idx != ARMV8_PMU_CYCLE_IDX) {
+		kvm_inject_undefined(vcpu);
 		return false;
+	}
 
 	return true;
 }
-- 
2.11.0

  parent reply	other threads:[~2017-03-27 16:03 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-03-27 16:03 [PATCH v2 0/9] arm64: KVM: Fix PMU exception generation Marc Zyngier
2017-03-27 16:03 ` Marc Zyngier
2017-03-27 16:03 ` [PATCH v2 1/9] arm64: KVM: PMU: Refactor pmu_*_el0_disabled Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-27 17:03   ` Suzuki K Poulose
2017-03-27 17:03     ` Suzuki K Poulose
2017-03-27 17:11     ` Marc Zyngier
2017-03-27 17:11       ` Marc Zyngier
2017-03-28 12:46   ` Christoffer Dall
2017-03-28 12:46     ` Christoffer Dall
2017-03-28 13:21     ` Marc Zyngier
2017-03-28 13:21       ` Marc Zyngier
2017-03-27 16:03 ` Marc Zyngier [this message]
2017-03-27 16:03   ` [PATCH v2 2/9] arm64: KVM: PMU: Inject UNDEF exception on illegal register access Marc Zyngier
2017-03-28 12:44   ` Christoffer Dall
2017-03-28 12:44     ` Christoffer Dall
2017-03-27 16:03 ` [PATCH v2 3/9] arm64: KVM: PMU: Inject UNDEF on non-privileged accesses Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:45   ` Christoffer Dall
2017-03-28 12:45     ` Christoffer Dall
2017-03-27 16:03 ` [PATCH v2 4/9] arm64: KVM: Make unexpected reads from WO registers inject an undef Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:45   ` Christoffer Dall
2017-03-28 12:45     ` Christoffer Dall
2017-03-27 16:03 ` [PATCH v2 5/9] arm64: KVM: PMU: Inject UNDEF on read access to PMSWINC_EL0 Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:45   ` Christoffer Dall
2017-03-28 12:45     ` Christoffer Dall
2017-03-27 16:03 ` [PATCH v2 6/9] arm64: KVM: Treat sysreg accessors returning false as successful Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:45   ` Christoffer Dall
2017-03-28 12:45     ` Christoffer Dall
2017-03-27 16:03 ` [PATCH v2 7/9] arm64: KVM: Do not corrupt registers on failed 64bit CP read Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:46   ` Christoffer Dall
2017-03-28 12:46     ` Christoffer Dall
2017-03-28 13:24     ` Marc Zyngier
2017-03-28 13:24       ` Marc Zyngier
2017-03-27 16:03 ` [PATCH v2 8/9] arm: KVM: Make unexpected register accesses inject an undef Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:46   ` Christoffer Dall
2017-03-28 12:46     ` Christoffer Dall
2017-03-27 16:03 ` [PATCH v2 9/9] arm: KVM: Treat CP15 accessors returning false as successful Marc Zyngier
2017-03-27 16:03   ` Marc Zyngier
2017-03-28 12:46   ` Christoffer Dall
2017-03-28 12:46     ` Christoffer Dall
2017-03-28 13:37 ` [PATCH v2 0/9] arm64: KVM: Fix PMU exception generation Christoffer Dall
2017-03-28 13:37   ` Christoffer Dall

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