From: Paolo Bonzini <pbonzini@redhat.com>
To: Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kvm@vger.kernel.org, Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>,
Maxim Levitsky <mlevitsk@redhat.com>,
Kechen Lu <kechenl@nvidia.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 3/5] KVM: x86: Use common 'enable_apicv' variable for both APICv and AVIC
Date: Mon, 24 May 2021 18:18:58 +0200 [thread overview]
Message-ID: <12eadbce-f688-77a1-27bf-c33fee2e7543@redhat.com> (raw)
In-Reply-To: <YKQmG3rMpwSI3WrV@google.com>
On 18/05/21 22:39, Sean Christopherson wrote:
>> +/* enable / disable AVIC */
>> +static int avic;
>> +module_param(avic, int, 0444);
> We should opportunistically make avic a "bool".
>
And also:
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 11714c22c9f1..48cb498ff070 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -185,9 +185,12 @@ module_param(vls, int, 0444);
static int vgif = true;
module_param(vgif, int, 0444);
-/* enable / disable AVIC */
-static int avic;
-module_param(avic, int, 0444);
+/*
+ * enable / disable AVIC. Because the defaults differ for APICv
+ * support between VMX and SVM we cannot use module_param_named.
+ */
+static bool avic;
+module_param(avic, bool, 0444);
bool __read_mostly dump_invalid_vmcb;
module_param(dump_invalid_vmcb, bool, 0644);
@@ -1013,11 +1016,7 @@ static __init int svm_hardware_setup(void)
nrips = false;
}
- if (!npt_enabled || !boot_cpu_has(X86_FEATURE_AVIC))
- avic = false;
-
- /* 'enable_apicv' is common between VMX/SVM but the defaults differ */
- enable_apicv = avic;
+ enable_apicv = avic && npt_enabled && boot_cpu_has(X86_FEATURE_AVIC);
if (enable_apicv) {
pr_info("AVIC enabled\n");
The "if" can come back when AVIC is enabled by default.
Paolo
next prev parent reply other threads:[~2021-05-24 16:19 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-18 14:43 [PATCH v2 0/5] KVM: x86: hyper-v: Conditionally allow SynIC with APICv/AVIC Vitaly Kuznetsov
2021-05-18 14:43 ` [PATCH v2 1/5] KVM: SVM: Drop unneeded CONFIG_X86_LOCAL_APIC check for AVIC Vitaly Kuznetsov
2021-05-18 19:57 ` Sean Christopherson
2021-05-26 9:54 ` Maxim Levitsky
2021-05-18 14:43 ` [PATCH v2 2/5] KVM: VMX: Drop unneeded CONFIG_X86_LOCAL_APIC check from cpu_has_vmx_posted_intr() Vitaly Kuznetsov
2021-05-18 19:57 ` Sean Christopherson
2021-05-26 9:54 ` Maxim Levitsky
2021-05-18 14:43 ` [PATCH v2 3/5] KVM: x86: Use common 'enable_apicv' variable for both APICv and AVIC Vitaly Kuznetsov
2021-05-18 20:39 ` Sean Christopherson
2021-05-19 7:58 ` Vitaly Kuznetsov
2021-05-24 16:18 ` Paolo Bonzini [this message]
2021-05-24 16:52 ` Sean Christopherson
2021-05-24 17:02 ` Paolo Bonzini
2021-05-26 9:56 ` Maxim Levitsky
2021-05-26 15:07 ` Sean Christopherson
2021-05-26 15:52 ` Maxim Levitsky
2021-05-27 11:39 ` Paolo Bonzini
2021-05-18 14:43 ` [PATCH v2 4/5] KVM: x86: Invert APICv/AVIC enablement check Vitaly Kuznetsov
2021-05-18 21:05 ` Sean Christopherson
2021-05-26 9:57 ` Maxim Levitsky
2021-05-26 10:40 ` Vitaly Kuznetsov
2021-05-26 11:11 ` Maxim Levitsky
2021-05-18 14:43 ` [PATCH v2 5/5] KVM: x86: hyper-v: Deactivate APICv only when AutoEOI feature is in use Vitaly Kuznetsov
2021-05-24 16:21 ` Paolo Bonzini
2021-05-25 6:23 ` Vitaly Kuznetsov
2021-05-25 7:11 ` Paolo Bonzini
2021-05-26 10:02 ` Maxim Levitsky
2021-05-26 10:01 ` Maxim Levitsky
2021-05-26 9:54 ` [PATCH v2 0/5] KVM: x86: hyper-v: Conditionally allow SynIC with APICv/AVIC Maxim Levitsky
2021-05-27 8:35 ` Vitaly Kuznetsov
2021-05-27 15:49 ` Maxim Levitsky
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