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KVM: x86: hyperv: keep track of mismatched VP indexes

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In most common cases VP index of a vcpu matches its vcpu index. Userspace
is, however, free to set any mapping it wishes and we need to account for
that when we need to find a vCPU with a particular VP index. To keep search
algorithms optimal in both cases introduce 'num_mismatched_vp_indexes'
counter showing how many vCPUs with mismatching VP index we have. In case
the counter is zero we can assume vp_index == vcpu_idx.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Roman Kagan <rkagan@virtuozzo.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov
2018-09-26 19:02:56 +02:00
committed by Paolo Bonzini
parent 1779a39f78
commit 87ee613d07
2 changed files with 26 additions and 3 deletions
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3
arch/x86/include/asm/kvm_host.h
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@@ -790,6 +790,9 @@ struct kvm_hv {
u64 hv_reenlightenment_control;
u64 hv_tsc_emulation_control;
u64 hv_tsc_emulation_status;
/* How many vCPUs have VP index != vCPU index */
atomic_t num_mismatched_vp_indexes;
};
enum kvm_irqchip_mode {