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Date:   Wed, 15 May 2019 12:11:52 +0800
From:   Wanpeng Li <>
Cc:     Paolo Bonzini <>,
        Radim Krčmář <>,
        Sean Christopherson <>,
        Liran Alon <>
Subject: [PATCH v2 2/4] KVM: LAPIC: Fix lapic_timer_advance_ns parameter overflow

From: Wanpeng Li <>

After commit c3941d9e0 (KVM: lapic: Allow user to disable adaptive tuning of
timer advancement), '-1' enables adaptive tuning starting from default
advancment of 1000ns. However, we should expose an int instead of an overflow
uint module parameter.

Before patch:


After patch:


Fixes: c3941d9e0 (KVM: lapic: Allow user to disable adaptive tuning of timer advancement)
Cc: Paolo Bonzini <>
Cc: Radim Krčmář <>
Cc: Sean Christopherson <>
Cc: Liran Alon <>
Reviewed-by: Sean Christopherson <>
Signed-off-by: Wanpeng Li <>
 arch/x86/kvm/x86.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index d75bb97..1d89cb9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -143,7 +143,7 @@ module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
  * tuning, i.e. allows priveleged userspace to set an exact advancement time.
 static int __read_mostly lapic_timer_advance_ns = -1;
-module_param(lapic_timer_advance_ns, uint, S_IRUGO | S_IWUSR);
+module_param(lapic_timer_advance_ns, int, S_IRUGO | S_IWUSR);
 static bool __read_mostly vector_hashing = true;
 module_param(vector_hashing, bool, S_IRUGO);

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