KVM: x86: recalculate_apic_map after enabling apic

Currently, recalculate_apic_map ignores vcpus whose lapic is software disabled
through the spurious interrupt vector. However, once it is re-enabled, the map
is not recalculated. Therefore, if the guest OS configured DFR while lapic is
software-disabled, the map may be incorrect. This patch recalculates apic map
after software enabling the lapic.

Signed-off-by: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 666c086..fb919c5 100644 (file)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -112,17 +112,6 @@ static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
 struct static_key_deferred apic_hw_disabled __read_mostly;
 struct static_key_deferred apic_sw_disabled __read_mostly;
 
-static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
-{
-       if ((kvm_apic_get_reg(apic, APIC_SPIV) ^ val) & APIC_SPIV_APIC_ENABLED) {
-               if (val & APIC_SPIV_APIC_ENABLED)
-                       static_key_slow_dec_deferred(&apic_sw_disabled);
-               else
-                       static_key_slow_inc(&apic_sw_disabled.key);
-       }
-       apic_set_reg(apic, APIC_SPIV, val);
-}
-
 static inline int apic_enabled(struct kvm_lapic *apic)
 {
        return kvm_apic_sw_enabled(apic) &&     kvm_apic_hw_enabled(apic);
@@ -210,6 +199,20 @@ out:
        kvm_vcpu_request_scan_ioapic(kvm);
 }
 
+static inline void apic_set_spiv(struct kvm_lapic *apic, u32 val)
+{
+       u32 prev = kvm_apic_get_reg(apic, APIC_SPIV);
+
+       apic_set_reg(apic, APIC_SPIV, val);
+       if ((prev ^ val) & APIC_SPIV_APIC_ENABLED) {
+               if (val & APIC_SPIV_APIC_ENABLED) {
+                       static_key_slow_dec_deferred(&apic_sw_disabled);
+                       recalculate_apic_map(apic->vcpu->kvm);
+               } else
+                       static_key_slow_inc(&apic_sw_disabled.key);
+       }
+}
+
 static inline void kvm_apic_set_id(struct kvm_lapic *apic, u8 id)
 {
        apic_set_reg(apic, APIC_ID, id << 24);