linux-kernel - [PATCH] x86/kvm: Downgrade host poll messages to pr_debug

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Message-ID: <20250722074958.2567-1-lirongqing@baidu.com>
Date: Tue, 22 Jul 2025 15:49:58 +0800
From: lirongqing <lirongqing@...du.com>
To: <pbonzini@...hat.com>, <vkuznets@...hat.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <bp@...en8.de>, <dave.hansen@...ux.intel.com>,
	<x86@...nel.org>, <hpa@...or.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>
CC: Li RongQing <lirongqing@...du.com>
Subject: [PATCH] x86/kvm: Downgrade host poll messages to pr_debug_once()

From: Li RongQing <lirongqing@...du.com>

The current host-side polling messages are misleading, as they will be
printed when the hypervisor intentionally disables polling (by providing
MWAIT to the guest) rather than due to version incompatibility. so
Downgrade to pr_debug_once() to prevent spurious log messages.

Signed-off-by: Li RongQing <lirongqing@...du.com>
---
 arch/x86/kernel/kvm.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index 9cda79f..c5f96ee 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -1136,8 +1136,8 @@ static void kvm_enable_host_haltpoll(void *i)
 void arch_haltpoll_enable(unsigned int cpu)
 {
 	if (!kvm_para_has_feature(KVM_FEATURE_POLL_CONTROL)) {
-		pr_err_once("host does not support poll control\n");
-		pr_err_once("host upgrade recommended\n");
+		pr_debug_once("host does not support poll control\n");
+		pr_debug_once("host upgrade recommended\n");
 		return;
 	}
 
-- 
2.9.4