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| author | Radim Krčmář <rkrcmar@redhat.com> | 2019-11-07 07:53:42 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2019-11-15 11:44:21 +0100 |
| commit | 8750e72a79dda2f665ce17b62049f4d62130d991 (patch) | |
| tree | 26c55833adf466e5eab151874c8d2e6c2eb25886 /include/linux/kvm_host.h | |
| parent | 662f1d1d19317e792ccfc53dee625c02dcefac58 (diff) | |
| download | lwn-8750e72a79dda2f665ce17b62049f4d62130d991.tar.gz lwn-8750e72a79dda2f665ce17b62049f4d62130d991.zip | |
KVM: remember position in kvm->vcpus array
Fetching an index for any vcpu in kvm->vcpus array by traversing
the entire array everytime is costly.
This patch remembers the position of each vcpu in kvm->vcpus array
by storing it in vcpus_idx under kvm_vcpu structure.
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Nitesh Narayan Lal <nitesh@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/linux/kvm_host.h')
| -rw-r--r-- | include/linux/kvm_host.h | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index a817e446c9aa..70b2296fb2ae 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -266,7 +266,8 @@ struct kvm_vcpu { struct preempt_notifier preempt_notifier; #endif int cpu; - int vcpu_id; + int vcpu_id; /* id given by userspace at creation */ + int vcpu_idx; /* index in kvm->vcpus array */ int srcu_idx; int mode; u64 requests; @@ -570,13 +571,7 @@ static inline struct kvm_vcpu *kvm_get_vcpu_by_id(struct kvm *kvm, int id) static inline int kvm_vcpu_get_idx(struct kvm_vcpu *vcpu) { - struct kvm_vcpu *tmp; - int idx; - - kvm_for_each_vcpu(idx, tmp, vcpu->kvm) - if (tmp == vcpu) - return idx; - BUG(); + return vcpu->vcpu_idx; } #define kvm_for_each_memslot(memslot, slots) \ |