This is a note to let you know that I've just added the patch titled
KVM: x86: fix vcpu initialization with userspace lapic
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
kvm-x86-fix-vcpu-initialization-with-userspace-lapic.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b7e31be385584afe7f073130e8e570d53c95f7fe Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@xxxxxxxxxx>
Date: Thu, 1 Mar 2018 15:24:25 +0100
Subject: KVM: x86: fix vcpu initialization with userspace lapic
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
From: Radim Krčmář <rkrcmar@xxxxxxxxxx>
commit b7e31be385584afe7f073130e8e570d53c95f7fe upstream.
Moving the code around broke this rare configuration.
Use this opportunity to finally call lapic reset from vcpu reset.
Reported-by: syzbot+fb7a33a4b6c35007a72b@xxxxxxxxxxxxxxxxxxxxxxxxx
Suggested-by: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Fixes: 0b2e9904c159 ("KVM: x86: move LAPIC initialization after VMCS creation")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Radim Krčmář <rkrcmar@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kvm/lapic.c | 10 ++++------
arch/x86/kvm/x86.c | 3 ++-
2 files changed, 6 insertions(+), 7 deletions(-)
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1993,14 +1993,13 @@ void kvm_lapic_set_base(struct kvm_vcpu
void kvm_lapic_reset(struct kvm_vcpu *vcpu, bool init_event)
{
- struct kvm_lapic *apic;
+ struct kvm_lapic *apic = vcpu->arch.apic;
int i;
- apic_debug("%s\n", __func__);
+ if (!apic)
+ return;
- ASSERT(vcpu);
- apic = vcpu->arch.apic;
- ASSERT(apic != NULL);
+ apic_debug("%s\n", __func__);
/* Stop the timer in case it's a reset to an active apic */
hrtimer_cancel(&apic->lapic_timer.timer);
@@ -2559,7 +2558,6 @@ void kvm_apic_accept_events(struct kvm_v
pe = xchg(&apic->pending_events, 0);
if (test_bit(KVM_APIC_INIT, &pe)) {
- kvm_lapic_reset(vcpu, true);
kvm_vcpu_reset(vcpu, true);
if (kvm_vcpu_is_bsp(apic->vcpu))
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7793,7 +7793,6 @@ 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;
@@ -7836,6 +7835,8 @@ void kvm_arch_vcpu_destroy(struct kvm_vc
void kvm_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
{
+ kvm_lapic_reset(vcpu, init_event);
+
vcpu->arch.hflags = 0;
vcpu->arch.smi_pending = 0;
Patches currently in stable-queue which might be from rkrcmar@xxxxxxxxxx are
queue-4.15/kvm-x86-fix-smram-accessing-even-if-vm-is-shutdown.patch
queue-4.15/kvm-x86-remove-indirect-msr-op-calls-from-spec_ctrl.patch
queue-4.15/kvm-mmu-fix-overlap-between-public-and-private-memslots.patch
queue-4.15/kvm-x86-fix-vcpu-initialization-with-userspace-lapic.patch
queue-4.15/kvm-vmx-optimize-vmx_vcpu_run-and-svm_vcpu_run-by-marking-the-rdmsr-path-as-unlikely.patch