----- gregkh@xxxxxxxxxxxxxxxxxxx wrote: > This is a note to let you know that I've just added the patch titled > > KVM: x86: move LAPIC initialization after VMCS creation > > to the 4.14-stable tree which can be found at: > > https://urldefense.proofpoint.com/v2/url?u=http-3A__www.kernel.org_git_-3Fp-3Dlinux_kernel_git_stable_stable-2Dqueue.git-3Ba-3Dsummary&d=DwIDAg&c=RoP1YumCXCgaWHvlZYR8PZh8Bv7qIrMUB65eapI_JnE&r=Jk6Q8nNzkQ6LJ6g42qARkg6ryIDGQr-yKXPNGZbpTx0&m=Maz6LWKMTB3dNz16rCuylqFxbAmuN_jMYMfsJWQAFFg&s=xUqY2YU9eAMKcYfwjC-gwZHcI3260P5mO4BpR_YGViM&e= > > 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@xxxxxxxxxxxxxxx> know about it. > > > From 0b2e9904c15963e715d33e5f3f1387f17d19333a Mon Sep 17 00:00:00 > 2001 > From: Paolo Bonzini <pbonzini@xxxxxxxxxx> > Date: Fri, 23 Feb 2018 23:29:32 +0100 > Subject: KVM: x86: move LAPIC initialization after VMCS creation > > From: Paolo Bonzini <pbonzini@xxxxxxxxxx> > > 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@xxxxxxxxxxxxxxx > Cc: Liran Alon <liran.alon@xxxxxxxxxx> > Signed-off-by: Paolo Bonzini <pbonzini@xxxxxxxxxx> > Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> 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