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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2018-09-26 19:02:59 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-17 00:29:47 +0200 |
| commit | 214ff83d4473a7757fa18a64dc7efe3b0e158486 (patch) | |
| tree | 1266430cc8c3a199d20d2856bc10e2e4bf7581c4 /arch/x86/kvm/x86.c | |
| parent | 2cefc5feb80cf4237890a6a4582a0d20e50d9ced (diff) | |
| download | lwn-214ff83d4473a7757fa18a64dc7efe3b0e158486.tar.gz lwn-214ff83d4473a7757fa18a64dc7efe3b0e158486.zip | |
KVM: x86: hyperv: implement PV IPI send hypercalls
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>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 1f3f95557703..20a667da0a31 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2912,6 +2912,7 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext) case KVM_CAP_HYPERV_VP_INDEX: case KVM_CAP_HYPERV_EVENTFD: case KVM_CAP_HYPERV_TLBFLUSH: + case KVM_CAP_HYPERV_SEND_IPI: case KVM_CAP_PCI_SEGMENT: case KVM_CAP_DEBUGREGS: case KVM_CAP_X86_ROBUST_SINGLESTEP: |