4.15-stable review patch.  If anyone has any objections, please let me know.


From: Paolo Bonzini <pbonz...@redhat.com>

commit 0b2e9904c15963e715d33e5f3f1387f17d19333a upstream.

The initial reset of the local APIC is performed before the VMCS has been
created, but it tries to do a vmwrite:

 vmwrite error: reg 810 value 4a00 (err 18944)
 CPU: 54 PID: 38652 Comm: qemu-kvm Tainted: G        W I      
4.16.0-0.rc2.git0.1.fc28.x86_64 #1
 Hardware name: Intel Corporation S2600CW/S2600CW, BIOS 
SE5C610.86B.01.01.0003.090520141303 09/05/2014
 Call Trace:
  vmx_set_rvi [kvm_intel]
  vmx_hwapic_irr_update [kvm_intel]
  kvm_lapic_reset [kvm]
  kvm_create_lapic [kvm]
  kvm_arch_vcpu_init [kvm]
  kvm_vcpu_init [kvm]
  vmx_create_vcpu [kvm_intel]
  kvm_vm_ioctl [kvm]

Move it later, after the VMCS has been created.

Fixes: 4191db26b714 ("KVM: x86: Update APICv on APIC reset")
Cc: sta...@vger.kernel.org
Cc: Liran Alon <liran.a...@oracle.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

 arch/x86/kvm/lapic.c |    1 -
 arch/x86/kvm/x86.c   |    1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -2156,7 +2156,6 @@ int kvm_create_lapic(struct kvm_vcpu *vc
        vcpu->arch.apic_base = MSR_IA32_APICBASE_ENABLE;
        static_key_slow_inc(&apic_sw_disabled.key); /* sw disabled at reset */
-       kvm_lapic_reset(vcpu, false);
        kvm_iodevice_init(&apic->dev, &apic_mmio_ops);
        return 0;
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7793,6 +7793,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu
        if (r)
                return r;
        kvm_vcpu_reset(vcpu, false);
+       kvm_lapic_reset(vcpu, false);
        return r;

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