linux-kernel - [PATCH 2/2] arm64/kvm: Drop checking target CPU type on initializing module

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Date:   Tue, 25 Aug 2020 16:18:56 +1000
From:   Gavin Shan <gshan@...hat.com>
To:     kvmarm@...ts.cs.columbia.edu
Cc:     linux-kernel@...r.kernel.org, maz@...nel.org,
        suzuki.poulose@....com
Subject: [PATCH 2/2] arm64/kvm: Drop checking target CPU type on initializing module

The target CPU type is validated when KVM module is initialized.
However, we always have a valid target CPU type since commit
<bca556ac468a> ("arm64/kvm: Add generic v8 KVM target").

So it's unnecessary to validate the target CPU type at that time
and this just drops it.

Signed-off-by: Gavin Shan <gshan@...hat.com>
---
 arch/arm64/kvm/arm.c | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/arch/arm64/kvm/arm.c b/arch/arm64/kvm/arm.c
index 691d21e4c717..faf4bc208a4a 100644
--- a/arch/arm64/kvm/arm.c
+++ b/arch/arm64/kvm/arm.c
@@ -1561,11 +1561,6 @@ static int init_hyp_mode(void)
 	return err;
 }
 
-static void check_kvm_target_cpu(void *ret)
-{
-	*(int *)ret = kvm_target_cpu();
-}
-
 struct kvm_vcpu *kvm_mpidr_to_vcpu(struct kvm *kvm, unsigned long mpidr)
 {
 	struct kvm_vcpu *vcpu;
@@ -1625,7 +1620,6 @@ void kvm_arch_irq_bypass_start(struct irq_bypass_consumer *cons)
 int kvm_arch_init(void *opaque)
 {
 	int err;
-	int ret, cpu;
 	bool in_hyp_mode;
 
 	if (!is_hyp_mode_available()) {
@@ -1640,14 +1634,6 @@ int kvm_arch_init(void *opaque)
 		return -ENODEV;
 	}
 
-	for_each_online_cpu(cpu) {
-		smp_call_function_single(cpu, check_kvm_target_cpu, &ret, 1);
-		if (ret < 0) {
-			kvm_err("Error, CPU %d not supported!\n", cpu);
-			return -ENODEV;
-		}
-	}
-
 	err = init_common_resources();
 	if (err)
 		return err;
-- 
2.23.0