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From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Cc: kernel-team@android.com, Will Deacon <will@kernel.org>
Subject: [PATCH v2 2/2] KVM: arm64: Remove S1PTW check from kvm_vcpu_dabt_iswrite()
Date: Tue, 15 Sep 2020 11:42:18 +0100	[thread overview]
Message-ID: <20200915104218.1284701-3-maz@kernel.org> (raw)
In-Reply-To: <20200915104218.1284701-1-maz@kernel.org>

Now that kvm_vcpu_trap_is_write_fault() checks for S1PTW, there
is no need for kvm_vcpu_dabt_iswrite() to do the same thing, as
we already check for this condition on all existing paths.

Drop the check and add a comment instead.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_emulate.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 4f618af660ba..1cc5f5f72d0b 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -303,10 +303,10 @@ static __always_inline bool kvm_vcpu_abt_iss1tw(const struct kvm_vcpu *vcpu)
 	return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_S1PTW);
 }
 
+/* Always check for S1PTW *before* using this. */
 static __always_inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 {
-	return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR) ||
-		kvm_vcpu_abt_iss1tw(vcpu); /* AF/DBM update */
+	return kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR;
 }
 
 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
-- 
2.28.0


WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will@kernel.org>, kernel-team@android.com
Subject: [PATCH v2 2/2] KVM: arm64: Remove S1PTW check from kvm_vcpu_dabt_iswrite()
Date: Tue, 15 Sep 2020 11:42:18 +0100	[thread overview]
Message-ID: <20200915104218.1284701-3-maz@kernel.org> (raw)
In-Reply-To: <20200915104218.1284701-1-maz@kernel.org>

Now that kvm_vcpu_trap_is_write_fault() checks for S1PTW, there
is no need for kvm_vcpu_dabt_iswrite() to do the same thing, as
we already check for this condition on all existing paths.

Drop the check and add a comment instead.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_emulate.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 4f618af660ba..1cc5f5f72d0b 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -303,10 +303,10 @@ static __always_inline bool kvm_vcpu_abt_iss1tw(const struct kvm_vcpu *vcpu)
 	return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_S1PTW);
 }
 
+/* Always check for S1PTW *before* using this. */
 static __always_inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 {
-	return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR) ||
-		kvm_vcpu_abt_iss1tw(vcpu); /* AF/DBM update */
+	return kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR;
 }
 
 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
-- 
2.28.0

_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: kvm@vger.kernel.org, kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will@kernel.org>, kernel-team@android.com
Subject: [PATCH v2 2/2] KVM: arm64: Remove S1PTW check from kvm_vcpu_dabt_iswrite()
Date: Tue, 15 Sep 2020 11:42:18 +0100	[thread overview]
Message-ID: <20200915104218.1284701-3-maz@kernel.org> (raw)
In-Reply-To: <20200915104218.1284701-1-maz@kernel.org>

Now that kvm_vcpu_trap_is_write_fault() checks for S1PTW, there
is no need for kvm_vcpu_dabt_iswrite() to do the same thing, as
we already check for this condition on all existing paths.

Drop the check and add a comment instead.

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/include/asm/kvm_emulate.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_emulate.h b/arch/arm64/include/asm/kvm_emulate.h
index 4f618af660ba..1cc5f5f72d0b 100644
--- a/arch/arm64/include/asm/kvm_emulate.h
+++ b/arch/arm64/include/asm/kvm_emulate.h
@@ -303,10 +303,10 @@ static __always_inline bool kvm_vcpu_abt_iss1tw(const struct kvm_vcpu *vcpu)
 	return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_S1PTW);
 }
 
+/* Always check for S1PTW *before* using this. */
 static __always_inline bool kvm_vcpu_dabt_iswrite(const struct kvm_vcpu *vcpu)
 {
-	return !!(kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR) ||
-		kvm_vcpu_abt_iss1tw(vcpu); /* AF/DBM update */
+	return kvm_vcpu_get_esr(vcpu) & ESR_ELx_WNR;
 }
 
 static inline bool kvm_vcpu_dabt_is_cm(const struct kvm_vcpu *vcpu)
-- 
2.28.0


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2020-09-15 10:44 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-15 10:42 [PATCH v2 0/2] KVM: arm64: Fix handling of S1PTW Marc Zyngier
2020-09-15 10:42 ` Marc Zyngier
2020-09-15 10:42 ` Marc Zyngier
2020-09-15 10:42 ` [PATCH v2 1/2] KVM: arm64: Assume write fault on S1PTW permission fault on instruction fetch Marc Zyngier
2020-09-15 10:42   ` Marc Zyngier
2020-09-15 10:42   ` Marc Zyngier
2020-09-21 12:54   ` Sasha Levin
2020-09-21 12:54     ` Sasha Levin
2020-09-15 10:42 ` Marc Zyngier [this message]
2020-09-15 10:42   ` [PATCH v2 2/2] KVM: arm64: Remove S1PTW check from kvm_vcpu_dabt_iswrite() Marc Zyngier
2020-09-15 10:42   ` Marc Zyngier
2020-09-18 13:37 ` [PATCH v2 0/2] KVM: arm64: Fix handling of S1PTW Will Deacon
2020-09-18 13:37   ` Will Deacon
2020-09-18 13:37   ` Will Deacon

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