From: Wanpeng Li <kernellwp@gmail.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
"Radim Krčmář" <rkrcmar@redhat.com>,
"Sean Christopherson" <sean.j.christopherson@intel.com>,
"Liran Alon" <liran.alon@oracle.com>
Subject: [PATCH v3 2/5] KVM: LAPIC: Fix lapic_timer_advance_ns parameter overflow
Date: Thu, 16 May 2019 11:06:17 +0800 [thread overview]
Message-ID: <1557975980-9875-3-git-send-email-wanpengli@tencent.com> (raw)
In-Reply-To: <1557975980-9875-1-git-send-email-wanpengli@tencent.com>
From: Wanpeng Li <wanpengli@tencent.com>
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:
/sys/module/kvm/parameters/lapic_timer_advance_ns:4294967295
After patch:
/sys/module/kvm/parameters/lapic_timer_advance_ns:-1
Fixes: c3941d9e0 (KVM: lapic: Allow user to disable adaptive tuning of timer advancement)
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Sean Christopherson <sean.j.christopherson@intel.com>
Cc: Liran Alon <liran.alon@oracle.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
---
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 b63e7b0..f2e3847 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);
--
2.7.4
next prev parent reply other threads:[~2019-05-16 3:06 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-16 3:06 [PATCH v3 0/5] KVM: LAPIC: Optimize timer latency further Wanpeng Li
2019-05-16 3:06 ` [PATCH v3 1/5] KVM: LAPIC: Extract adaptive tune timer advancement logic Wanpeng Li
2019-05-16 3:06 ` Wanpeng Li [this message]
2019-05-16 3:06 ` [PATCH v3 3/5] KVM: LAPIC: Expose per-vCPU timer_advance_ns to userspace Wanpeng Li
2019-05-17 20:05 ` Sean Christopherson
2019-05-20 8:43 ` Wanpeng Li
2019-05-16 3:06 ` [PATCH v3 4/5] KVM: LAPIC: Delay trace advance expire delta Wanpeng Li
2019-05-17 19:44 ` Sean Christopherson
2019-05-20 6:38 ` Wanpeng Li
2019-05-20 14:56 ` Sean Christopherson
2019-05-16 3:06 ` [PATCH v3 5/5] KVM: LAPIC: Optimize timer latency further Wanpeng Li
2019-05-17 19:50 ` Sean Christopherson
2019-05-20 8:19 ` Wanpeng Li
2019-05-20 15:08 ` Sean Christopherson
2019-06-12 9:35 [PATCH v3 0/5] " Wanpeng Li
2019-06-12 9:35 ` [PATCH v3 2/5] KVM: LAPIC: Fix lapic_timer_advance_ns parameter overflow Wanpeng Li
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