----- gregkh@linuxfoundation.org wrote:
This is a note to let you know that I've just added the patch titled
KVM: x86: move LAPIC initialization after VMCS creationto the 4.14-stable tree which can be found at: https://urldefense.proofpoint.com/v2/url?u=http-3A__www.kernel.org_git_-3Fp-...
The filename of the patch is: kvm-x86-move-lapic-initialization-after-vmcs-creation.patch and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.
From 0b2e9904c15963e715d33e5f3f1387f17d19333a Mon Sep 17 00:00:00 2001 From: Paolo Bonzini pbonzini@redhat.com Date: Fri, 23 Feb 2018 23:29:32 +0100 Subject: KVM: x86: move LAPIC initialization after VMCS creation
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
This commit broke a rare configuration. Don't we want to apply this to stable-tree together with the fix for that? The fix is at upstream commit b7e31be38558 ("KVM: x86: fix vcpu initialization with userspace lapic")
-Liran