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KVM: x86: Fix PV IPIs for 32-bit KVM host

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The recognition of the KVM_HC_SEND_IPI hypercall was unintentionally
wrapped in "#ifdef CONFIG_X86_64", causing 32-bit KVM hosts to reject
any and all PV IPI requests despite advertising the feature.  This
results in all KVM paravirtualized guests hanging during SMP boot due
to IPIs never being delivered.

Fixes: 4180bf1b65 ("KVM: X86: Implement "send IPI" hypercall")
Cc: stable@vger.kernel.org
Cc: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2019-01-23 09:22:39 -08:00 committed by Paolo Bonzini
parent f1adceaf01
commit 1ed199a41c
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/x86.c
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@ -7092,10 +7092,10 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
case KVM_HC_CLOCK_PAIRING: case KVM_HC_CLOCK_PAIRING:
ret = kvm_pv_clock_pairing(vcpu, a0, a1); ret = kvm_pv_clock_pairing(vcpu, a0, a1);
break; break;
#endif
case KVM_HC_SEND_IPI: case KVM_HC_SEND_IPI:
ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit); ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit);
break; break;
#endif
default: default:
ret = -KVM_ENOSYS; ret = -KVM_ENOSYS;
break; break;