Remove __apic_test_and_set_vector() and __apic_test_and_clear_vector(),
because the _only_ register that's safe to modify with a non-atomic
operation is ISR, because KVM isn't running the vCPU, i.e. hardware can't
service an IRQ or process an EOI for the relevant (virtual) APIC.
No functional change intended.
Suggested-by: Sean Christopherson <seanjc@xxxxxxxxxx>
Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@xxxxxxx>
---
Changes since v7:
- Removed "inline" from apic_vector_to_isr().
- Commit log updates.
arch/x86/kvm/lapic.c | 19 +++++++------------
1 file changed, 7 insertions(+), 12 deletions(-)
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 73418dc0ebb2..013e8681247f 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -125,16 +125,6 @@ bool kvm_apic_pending_eoi(struct kvm_vcpu *vcpu, int vector)
apic_test_vector(vector, apic->regs + APIC_IRR);
}
-static inline int __apic_test_and_set_vector(int vec, void *bitmap)
-{
- return __test_and_set_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
-}
-
-static inline int __apic_test_and_clear_vector(int vec, void *bitmap)
-{
- return __test_and_clear_bit(VEC_POS(vec), (bitmap) + REG_POS(vec));
-}
-
__read_mostly DEFINE_STATIC_KEY_FALSE(kvm_has_noapic_vcpu);
EXPORT_SYMBOL_GPL(kvm_has_noapic_vcpu);
@@ -744,9 +734,14 @@ void kvm_apic_clear_irr(struct kvm_vcpu *vcpu, int vec)
}
EXPORT_SYMBOL_GPL(kvm_apic_clear_irr);
+static void *apic_vector_to_isr(int vec, struct kvm_lapic *apic)
+{
+ return apic->regs + APIC_ISR + REG_POS(vec);
+}
+
static inline void apic_set_isr(int vec, struct kvm_lapic *apic)
{
- if (__apic_test_and_set_vector(vec, apic->regs + APIC_ISR))
+ if (__test_and_set_bit(VEC_POS(vec), apic_vector_to_isr(vec, apic)))
return;
/*
@@ -789,7 +784,7 @@ static inline int apic_find_highest_isr(struct kvm_lapic *apic)
static inline void apic_clear_isr(int vec, struct kvm_lapic *apic)
{
- if (!__apic_test_and_clear_vector(vec, apic->regs + APIC_ISR))
+ if (!__test_and_clear_bit(VEC_POS(vec), apic_vector_to_isr(vec, apic)))
return;
/*
--
2.34.1
