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From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Subject: [PATCH 1/3] arm64: KVM: Drop hyp_alternate_select for checking for ARM64_WORKAROUND_834220
Date: Sun,  1 Sep 2019 22:12:35 +0100	[thread overview]
Message-ID: <20190901211237.11673-2-maz@kernel.org> (raw)
In-Reply-To: <20190901211237.11673-1-maz@kernel.org>

There is no reason for using hyp_alternate_select when checking
for ARM64_WORKAROUND_834220, as each of the capabilities is
also backed by a static key. Just replace the KVM-specific
construct with cpus_have_const_cap(ARM64_WORKAROUND_834220).

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/switch.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index adaf266d8de8..a15baca9aca0 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -229,20 +229,6 @@ static void __hyp_text __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
 	}
 }
 
-static bool __hyp_text __true_value(void)
-{
-	return true;
-}
-
-static bool __hyp_text __false_value(void)
-{
-	return false;
-}
-
-static hyp_alternate_select(__check_arm_834220,
-			    __false_value, __true_value,
-			    ARM64_WORKAROUND_834220);
-
 static bool __hyp_text __translate_far_to_hpfar(u64 far, u64 *hpfar)
 {
 	u64 par, tmp;
@@ -298,7 +284,8 @@ static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu)
 	 * resolve the IPA using the AT instruction.
 	 */
 	if (!(esr & ESR_ELx_S1PTW) &&
-	    (__check_arm_834220()() || (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
+	    (cpus_have_const_cap(ARM64_WORKAROUND_834220) ||
+	     (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
 		if (!__translate_far_to_hpfar(far, &hpfar))
 			return false;
 	} else {
-- 
2.20.1

_______________________________________________
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: kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 1/3] arm64: KVM: Drop hyp_alternate_select for checking for ARM64_WORKAROUND_834220
Date: Sun,  1 Sep 2019 22:12:35 +0100	[thread overview]
Message-ID: <20190901211237.11673-2-maz@kernel.org> (raw)
In-Reply-To: <20190901211237.11673-1-maz@kernel.org>

There is no reason for using hyp_alternate_select when checking
for ARM64_WORKAROUND_834220, as each of the capabilities is
also backed by a static key. Just replace the KVM-specific
construct with cpus_have_const_cap(ARM64_WORKAROUND_834220).

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/switch.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index adaf266d8de8..a15baca9aca0 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -229,20 +229,6 @@ static void __hyp_text __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
 	}
 }
 
-static bool __hyp_text __true_value(void)
-{
-	return true;
-}
-
-static bool __hyp_text __false_value(void)
-{
-	return false;
-}
-
-static hyp_alternate_select(__check_arm_834220,
-			    __false_value, __true_value,
-			    ARM64_WORKAROUND_834220);
-
 static bool __hyp_text __translate_far_to_hpfar(u64 far, u64 *hpfar)
 {
 	u64 par, tmp;
@@ -298,7 +284,8 @@ static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu)
 	 * resolve the IPA using the AT instruction.
 	 */
 	if (!(esr & ESR_ELx_S1PTW) &&
-	    (__check_arm_834220()() || (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
+	    (cpus_have_const_cap(ARM64_WORKAROUND_834220) ||
+	     (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
 		if (!__translate_far_to_hpfar(far, &hpfar))
 			return false;
 	} else {
-- 
2.20.1


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

WARNING: multiple messages have this Message-ID (diff)
From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu,
	linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org
Cc: James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>
Subject: [PATCH 1/3] arm64: KVM: Drop hyp_alternate_select for checking for ARM64_WORKAROUND_834220
Date: Sun,  1 Sep 2019 22:12:35 +0100	[thread overview]
Message-ID: <20190901211237.11673-2-maz@kernel.org> (raw)
In-Reply-To: <20190901211237.11673-1-maz@kernel.org>

There is no reason for using hyp_alternate_select when checking
for ARM64_WORKAROUND_834220, as each of the capabilities is
also backed by a static key. Just replace the KVM-specific
construct with cpus_have_const_cap(ARM64_WORKAROUND_834220).

Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 arch/arm64/kvm/hyp/switch.c | 17 ++---------------
 1 file changed, 2 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c
index adaf266d8de8..a15baca9aca0 100644
--- a/arch/arm64/kvm/hyp/switch.c
+++ b/arch/arm64/kvm/hyp/switch.c
@@ -229,20 +229,6 @@ static void __hyp_text __hyp_vgic_restore_state(struct kvm_vcpu *vcpu)
 	}
 }
 
-static bool __hyp_text __true_value(void)
-{
-	return true;
-}
-
-static bool __hyp_text __false_value(void)
-{
-	return false;
-}
-
-static hyp_alternate_select(__check_arm_834220,
-			    __false_value, __true_value,
-			    ARM64_WORKAROUND_834220);
-
 static bool __hyp_text __translate_far_to_hpfar(u64 far, u64 *hpfar)
 {
 	u64 par, tmp;
@@ -298,7 +284,8 @@ static bool __hyp_text __populate_fault_info(struct kvm_vcpu *vcpu)
 	 * resolve the IPA using the AT instruction.
 	 */
 	if (!(esr & ESR_ELx_S1PTW) &&
-	    (__check_arm_834220()() || (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
+	    (cpus_have_const_cap(ARM64_WORKAROUND_834220) ||
+	     (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
 		if (!__translate_far_to_hpfar(far, &hpfar))
 			return false;
 	} else {
-- 
2.20.1


  reply	other threads:[~2019-09-01 21:13 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-01 21:12 [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye Marc Zyngier
2019-09-01 21:12 ` Marc Zyngier
2019-09-01 21:12 ` Marc Zyngier
2019-09-01 21:12 ` Marc Zyngier [this message]
2019-09-01 21:12   ` [PATCH 1/3] arm64: KVM: Drop hyp_alternate_select for checking for ARM64_WORKAROUND_834220 Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12 ` [PATCH 2/3] arm64: KVM: Replace hyp_alternate_select with has_vhe() Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12 ` [PATCH 3/3] arm64: KVM: Kill hyp_alternate_select() Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-01 21:12   ` Marc Zyngier
2019-09-02  8:00 ` [PATCH 0/3] arm64: KVM: Kiss hyp_alternate_select() goodbye Christoffer Dall
2019-09-02  8:00   ` Christoffer Dall
2019-09-02  8:00   ` Christoffer Dall
2019-09-02  8:34 ` Andrew Jones
2019-09-02  8:34   ` Andrew Jones
2019-09-02  8:34   ` Andrew Jones

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