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KVM: x86: decouple irqchip_in_kernel() and pic_irqchip() 

irqchip_in_kernel() tried to save a bit by reusing pic_irqchip(), but it
just complicated the code.
Add a separate state for the irqchip mode.

Reviewed-by: David Hildenbrand <david@redhat.com>
[Used Paolo's version of condition in irqchip_in_kernel().]
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
This commit is contained in:
Radim Krčmář 2016-12-16 16:10:02 +01:00
parent 35e6eaa3df
commit 49776faf93
3 changed files with 18 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
arch/x86/include/asm/kvm_host.h
View File

@ -716,6 +716,12 @@ struct kvm_hv {
HV_REFERENCE_TSC_PAGE tsc_ref;
};
enum kvm_irqchip_mode {
KVM_IRQCHIP_NONE,
KVM_IRQCHIP_KERNEL, /* created with KVM_CREATE_IRQCHIP */
KVM_IRQCHIP_SPLIT, /* created with KVM_CAP_SPLIT_IRQCHIP */
};
struct kvm_arch {
unsigned int n_used_mmu_pages;
unsigned int n_requested_mmu_pages;
@ -788,7 +794,7 @@ struct kvm_arch {
u64 disabled_quirks;
bool irqchip_split;
enum kvm_irqchip_mode irqchip_mode;
u8 nr_reserved_ioapic_pins;
bool disabled_lapic_found;

15
arch/x86/kvm/irq.h
View File

@ -93,18 +93,19 @@ static inline int pic_in_kernel(struct kvm *kvm)
static inline int irqchip_split(struct kvm *kvm)
{
return kvm->arch.irqchip_split;
return kvm->arch.irqchip_mode == KVM_IRQCHIP_SPLIT;
}
static inline int irqchip_kernel(struct kvm *kvm)
{
return kvm->arch.irqchip_mode == KVM_IRQCHIP_KERNEL;
}
static inline int irqchip_in_kernel(struct kvm *kvm)
{
struct kvm_pic *vpic = pic_irqchip(kvm);
bool ret;
bool ret = kvm->arch.irqchip_mode != KVM_IRQCHIP_NONE;
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;
}

5
arch/x86/kvm/x86.c
View File

@ -3894,7 +3894,7 @@ static int kvm_vm_ioctl_enable_cap(struct kvm *kvm,
goto split_irqchip_unlock;
/* Pairs with irqchip_in_kernel. */
smp_wmb();
kvm->arch.irqchip_split = true;
kvm->arch.irqchip_mode = KVM_IRQCHIP_SPLIT;
kvm->arch.nr_reserved_ioapic_pins = cap->args[0];
r = 0;
split_irqchip_unlock:
@ -3988,8 +3988,9 @@ 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_mode = KVM_IRQCHIP_KERNEL;
kvm->arch.vpic = vpic;
create_irqchip_unlock:
mutex_unlock(&kvm->lock);