irqchip_in_kernel() tried to save a bit by reusing pic_irqchip(), but it
just complicated the code.
Add kvm->arch.irqchip_kvm that matches kvm->arch.irqchip_split.
(Turning them into an exclusive type would be nicer.)
Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/irq.h | 13 +++++++------
arch/x86/kvm/x86.c | 3 ++-
3 files changed, 10 insertions(+), 7 deletions(-)
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index bdde80731f49..929228ec2839 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -778,6 +778,7 @@ struct kvm_arch {
u64 disabled_quirks;
+ bool irqchip_kvm;
bool irqchip_split;
u8 nr_reserved_ioapic_pins;
diff --git a/arch/x86/kvm/irq.h b/arch/x86/kvm/irq.h
index 035731eb3897..8536be85d529 100644
--- a/arch/x86/kvm/irq.h
+++ b/arch/x86/kvm/irq.h
@@ -96,15 +96,16 @@ static inline int irqchip_split(struct kvm *kvm)
return kvm->arch.irqchip_split;
}
+static inline int irqchip_kvm(struct kvm *kvm)
+{
+ return kvm->arch.irqchip_kvm;
+}
+
static inline int irqchip_in_kernel(struct kvm *kvm)
{
- struct kvm_pic *vpic = pic_irqchip(kvm);
- bool ret;
+ bool ret = irqchip_kvm(kvm) || irqchip_split(kvm);
- ret = (vpic != NULL);
- ret |= irqchip_split(kvm);
-
- /* Read vpic before kvm->irq_routing. */
+ /* Matches with wmb after initializing kvm->irq_routing. */
smp_rmb();
return ret;
}
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index dbed51045c37..dd8431a7e18b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3928,8 +3928,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
mutex_unlock(&kvm->slots_lock);
goto create_irqchip_unlock;
}
- /* Write kvm->irq_routing before kvm->arch.vpic. */
+ /* Write kvm->irq_routing before enabling irqchip_in_kernel. */
smp_wmb();
+ kvm->arch.irqchip_kvm = true;
kvm->arch.vpic = vpic;
create_irqchip_unlock:
mutex_unlock(&kvm->lock);
--
2.10.2
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