lkml.org 
[lkml]   [2018]   [Mar]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 4.15 114/122] KVM: x86: move LAPIC initialization after VMCS creation
Date
4.15-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
@@ -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);
kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
return r;

\
 
 \ /
  Last update: 2018-03-07 21:18    [W:0.336 / U:4.892 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site