KVM: x86: Set BSP bit in reset BSP vCPU's APIC base by default

Set the BSP bit appropriately during local APIC "reset" instead of
relying on vendor code to clean up at a later point.  This is a step
towards consolidating the local APIC, VMX, and SVM xAPIC initialization
code.

Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210713163324.627647-16-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index acb201d..0fb282b 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2321,6 +2321,7 @@ EXPORT_SYMBOL_GPL(kvm_apic_update_apicv);
 void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
 {
        struct kvm_lapic *apic = vcpu->arch.apic;
+       u64 msr_val;
        int i;
 
        if (!apic)
@@ -2330,8 +2331,10 @@ void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
        hrtimer_cancel(&apic->lapic_timer.timer);
 
        if (!init_event) {
-               kvm_lapic_set_base(vcpu, APIC_DEFAULT_PHYS_BASE |
-                                        MSR_IA32_APICBASE_ENABLE);
+               msr_val = APIC_DEFAULT_PHYS_BASE | MSR_IA32_APICBASE_ENABLE;
+               if (kvm_vcpu_is_reset_bsp(vcpu))
+                       msr_val |= MSR_IA32_APICBASE_BSP;
+               kvm_lapic_set_base(vcpu, msr_val);
                kvm_apic_set_xapic_id(apic, vcpu->vcpu_id);
        }
        kvm_apic_set_version(apic->vcpu);