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Subject[PATCH 4.14 100/110] KVM: x86: move LAPIC initialization after VMCS creation
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini <pbonzini@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: stable@vger.kernel.org
Cc: Liran Alon <liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@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
@@ -2107,7 +2107,6 @@ 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
@@ -7779,6 +7779,7 @@ int kvm_arch_vcpu_setup(struct kvm_vcpu
if (r)
return r;
kvm_vcpu_reset(vcpu, false);
+ kvm_lapic_reset(vcpu, false);
kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
return r;

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