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KVM: x86: hyperv: implement PV IPI send hypercalls

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Using hypercall for sending IPIs is faster because this allows to specify
any number of vCPUs (even > 64 with sparse CPU set), the whole procedure
will take only one VMEXIT.

Current Hyper-V TLFS (v5.0b) claims that HvCallSendSyntheticClusterIpi
hypercall can't be 'fast' (passing parameters through registers) but
apparently this is not true, Windows always uses it as 'fast' so we need
to support that.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov
2018-09-26 19:02:59 +02:00
committed by Paolo Bonzini
parent 2cefc5feb8
commit 214ff83d44
5 changed files with 166 additions and 0 deletions
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include/uapi/linux/kvm.h
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@@ -955,6 +955,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_INJECT_SERROR_ESR 158
#define KVM_CAP_MSR_PLATFORM_INFO 159
#define KVM_CAP_PPC_NESTED_HV 160
#define KVM_CAP_HYPERV_SEND_IPI 161
#ifdef KVM_CAP_IRQ_ROUTING