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authorSean Christopherson <sean.j.christopherson@intel.com>2019-01-23 09:22:39 -0800
committerPaolo Bonzini <pbonzini@redhat.com>2019-01-25 19:11:32 +0100
commit1ed199a41c70ad7bfaee8b14f78e791fcf43b278 (patch)
tree6b13882a3c7f14cd8dc5b39f58c07252f436d587
parentf1adceaf01f0446e69c15b32f24ce98e3c3623f1 (diff)
downloadlinux-1ed199a41c70ad7bfaee8b14f78e791fcf43b278.tar.bz2
KVM: x86: Fix PV IPIs for 32-bit KVM host
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: 4180bf1b655a ("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>
-rw-r--r--arch/x86/kvm/x86.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f14bb806aeed..d21dcad397e4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7092,10 +7092,10 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
case KVM_HC_CLOCK_PAIRING:
ret = kvm_pv_clock_pairing(vcpu, a0, a1);
break;
+#endif
case KVM_HC_SEND_IPI:
ret = kvm_pv_send_ipi(vcpu->kvm, a0, a1, a2, a3, op_64_bit);
break;
-#endif
default:
ret = -KVM_ENOSYS;
break;