linux-kernel - [PATCH] kvm: preemption must be disabled when calling smp_call_function

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Message-ID: <aEQW81I9kO5-eyrg@pc>
Date: Sat, 7 Jun 2025 11:39:47 +0100
From: Salah Triki <salah.triki@...il.com>
To: Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc: salah.triki@...il.com
Subject: [PATCH] kvm: preemption must be disabled when calling
 smp_call_function_many

{Disable, Enable} preemption {before, after} calling
smp_call_function_many().

Signed-off-by: Salah Triki <salah.triki@...il.com>
---
 virt/kvm/kvm_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index eec82775c5bf..ab9593943846 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -209,7 +209,10 @@ static inline bool kvm_kick_many_cpus(struct cpumask *cpus, bool wait)
 	if (cpumask_empty(cpus))
 		return false;
 
+	preempt_disable();
 	smp_call_function_many(cpus, ack_kick, NULL, wait);
+	preempt_enable();
+
 	return true;
 }
 
-- 
2.43.0