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From: Andrew Scull <ascull@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: kernel-team@android.com, maz@kernel.org,
	linux-kernel@vger.kernel.org, catalin.marinas@arm.com,
	will@kernel.org
Subject: [PATCH v2 3/4] KVM: arm64: Use BUG and BUG_ON in nVHE hyp
Date: Tue, 23 Feb 2021 15:57:58 +0000	[thread overview]
Message-ID: <20210223155759.3495252-4-ascull@google.com> (raw)
In-Reply-To: <20210223155759.3495252-1-ascull@google.com>

hyp_panic() reports the address of the panic by using ELR_EL2, but this
isn't a useful address when hyp_panic() is called directly. Replace such
direct calls with BUG() and BUG_ON() which use BRK to trigger and
exception that then goes to hyp_panic() with the correct address. Also
remove the hyp_panic() declaration from the header file to avoid
accidental misuse.

Signed-off-by: Andrew Scull <ascull@google.com>
---
 arch/arm64/include/asm/kvm_hyp.h   | 1 -
 arch/arm64/kvm/hyp/nvhe/hyp-main.c | 2 +-
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c  | 6 ++----
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index fb8404fefd1f..746eb9a2891b 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -95,7 +95,6 @@ u64 __guest_enter(struct kvm_vcpu *vcpu);
 
 bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt);
 
-void __noreturn hyp_panic(void);
 #ifdef __KVM_NVHE_HYPERVISOR__
 void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
 			       u64 elr, u64 par);
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index a906f9e2ff34..9f37a4240562 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -181,6 +181,6 @@ void handle_trap(struct kvm_cpu_context *host_ctxt)
 		handle_host_smc(host_ctxt);
 		break;
 	default:
-		hyp_panic();
+		BUG();
 	}
 }
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
index 2997aa156d8e..4495aed04240 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
@@ -18,8 +18,7 @@ u64 __ro_after_init hyp_cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID
 
 u64 cpu_logical_map(unsigned int cpu)
 {
-	if (cpu >= ARRAY_SIZE(hyp_cpu_logical_map))
-		hyp_panic();
+	BUG_ON(cpu >= ARRAY_SIZE(hyp_cpu_logical_map));
 
 	return hyp_cpu_logical_map[cpu];
 }
@@ -30,8 +29,7 @@ unsigned long __hyp_per_cpu_offset(unsigned int cpu)
 	unsigned long this_cpu_base;
 	unsigned long elf_base;
 
-	if (cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base))
-		hyp_panic();
+	BUG_ON(cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base));
 
 	cpu_base_array = (unsigned long *)hyp_symbol_addr(kvm_arm_hyp_percpu_base);
 	this_cpu_base = kern_hyp_va(cpu_base_array[cpu]);
-- 
2.30.0.617.g56c4b15f3c-goog

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WARNING: multiple messages have this Message-ID (diff)
From: Andrew Scull <ascull@google.com>
To: kvmarm@lists.cs.columbia.edu
Cc: linux-kernel@vger.kernel.org, maz@kernel.org,
	james.morse@arm.com, suzuki.poulose@arm.com,
	julien.thierry.kdev@gmail.com, will@kernel.org,
	catalin.marinas@arm.com, kernel-team@android.com,
	Andrew Scull <ascull@google.com>
Subject: [PATCH v2 3/4] KVM: arm64: Use BUG and BUG_ON in nVHE hyp
Date: Tue, 23 Feb 2021 15:57:58 +0000	[thread overview]
Message-ID: <20210223155759.3495252-4-ascull@google.com> (raw)
In-Reply-To: <20210223155759.3495252-1-ascull@google.com>

hyp_panic() reports the address of the panic by using ELR_EL2, but this
isn't a useful address when hyp_panic() is called directly. Replace such
direct calls with BUG() and BUG_ON() which use BRK to trigger and
exception that then goes to hyp_panic() with the correct address. Also
remove the hyp_panic() declaration from the header file to avoid
accidental misuse.

Signed-off-by: Andrew Scull <ascull@google.com>
---
 arch/arm64/include/asm/kvm_hyp.h   | 1 -
 arch/arm64/kvm/hyp/nvhe/hyp-main.c | 2 +-
 arch/arm64/kvm/hyp/nvhe/hyp-smp.c  | 6 ++----
 3 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/arch/arm64/include/asm/kvm_hyp.h b/arch/arm64/include/asm/kvm_hyp.h
index fb8404fefd1f..746eb9a2891b 100644
--- a/arch/arm64/include/asm/kvm_hyp.h
+++ b/arch/arm64/include/asm/kvm_hyp.h
@@ -95,7 +95,6 @@ u64 __guest_enter(struct kvm_vcpu *vcpu);
 
 bool kvm_host_psci_handler(struct kvm_cpu_context *host_ctxt);
 
-void __noreturn hyp_panic(void);
 #ifdef __KVM_NVHE_HYPERVISOR__
 void __noreturn __hyp_do_panic(struct kvm_cpu_context *host_ctxt, u64 spsr,
 			       u64 elr, u64 par);
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-main.c b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
index a906f9e2ff34..9f37a4240562 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-main.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-main.c
@@ -181,6 +181,6 @@ void handle_trap(struct kvm_cpu_context *host_ctxt)
 		handle_host_smc(host_ctxt);
 		break;
 	default:
-		hyp_panic();
+		BUG();
 	}
 }
diff --git a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
index 2997aa156d8e..4495aed04240 100644
--- a/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
+++ b/arch/arm64/kvm/hyp/nvhe/hyp-smp.c
@@ -18,8 +18,7 @@ u64 __ro_after_init hyp_cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = INVALID
 
 u64 cpu_logical_map(unsigned int cpu)
 {
-	if (cpu >= ARRAY_SIZE(hyp_cpu_logical_map))
-		hyp_panic();
+	BUG_ON(cpu >= ARRAY_SIZE(hyp_cpu_logical_map));
 
 	return hyp_cpu_logical_map[cpu];
 }
@@ -30,8 +29,7 @@ unsigned long __hyp_per_cpu_offset(unsigned int cpu)
 	unsigned long this_cpu_base;
 	unsigned long elf_base;
 
-	if (cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base))
-		hyp_panic();
+	BUG_ON(cpu >= ARRAY_SIZE(kvm_arm_hyp_percpu_base));
 
 	cpu_base_array = (unsigned long *)hyp_symbol_addr(kvm_arm_hyp_percpu_base);
 	this_cpu_base = kern_hyp_va(cpu_base_array[cpu]);
-- 
2.30.0.617.g56c4b15f3c-goog


  parent reply	other threads:[~2021-02-23 15:58 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-23 15:57 [PATCH v2 0/4] Debug info for nVHE hyp panics Andrew Scull
2021-02-23 15:57 ` Andrew Scull
2021-02-23 15:57 ` [PATCH v2 1/4] bug: Remove redundant condition check in report_bug Andrew Scull
2021-02-23 15:57   ` Andrew Scull
2021-02-23 16:25   ` Steven Rostedt
2021-02-23 16:25     ` Steven Rostedt
2021-02-23 15:57 ` [PATCH v2 2/4] bug: Factor out a getter for a bug's file line Andrew Scull
2021-02-23 15:57   ` Andrew Scull
2021-02-23 16:35   ` Steven Rostedt
2021-02-23 16:35     ` Steven Rostedt
2021-02-23 15:57 ` Andrew Scull [this message]
2021-02-23 15:57   ` [PATCH v2 3/4] KVM: arm64: Use BUG and BUG_ON in nVHE hyp Andrew Scull
2021-02-23 15:57 ` [PATCH v2 4/4] KVM: arm64: Log source when panicking from " Andrew Scull
2021-02-23 15:57   ` Andrew Scull

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