Patch "KVM: x86: Fix APIC map calculation after re-enabling" has been added to the 3.12-stable tree

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This is a note to let you know that I've just added the patch titled

    KVM: x86: Fix APIC map calculation after re-enabling

to the 3.12-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-apic-map-calculation-after-re-enabling.patch
and it can be found in the queue-3.12 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From e66d2ae7c67bd9ac982a3d1890564de7f7eabf4b Mon Sep 17 00:00:00 2001
From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Date: Sun, 29 Dec 2013 02:29:30 +0100
Subject: KVM: x86: Fix APIC map calculation after re-enabling

From: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>

commit e66d2ae7c67bd9ac982a3d1890564de7f7eabf4b upstream.

Update arch.apic_base before triggering recalculate_apic_map. Otherwise
the recalculation will work against the previous state of the APIC and
will fail to build the correct map when an APIC is hardware-enabled
again.

This fixes a regression of 1e08ec4a13.

Signed-off-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx>
Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 arch/x86/kvm/lapic.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1350,6 +1350,10 @@ void kvm_lapic_set_base(struct kvm_vcpu
 		return;
 	}
 
+	if (!kvm_vcpu_is_bsp(apic->vcpu))
+		value &= ~MSR_IA32_APICBASE_BSP;
+	vcpu->arch.apic_base = value;
+
 	/* update jump label if enable bit changes */
 	if ((vcpu->arch.apic_base ^ value) & MSR_IA32_APICBASE_ENABLE) {
 		if (value & MSR_IA32_APICBASE_ENABLE)
@@ -1359,10 +1363,6 @@ void kvm_lapic_set_base(struct kvm_vcpu
 		recalculate_apic_map(vcpu->kvm);
 	}
 
-	if (!kvm_vcpu_is_bsp(apic->vcpu))
-		value &= ~MSR_IA32_APICBASE_BSP;
-
-	vcpu->arch.apic_base = value;
 	if ((old_value ^ value) & X2APIC_ENABLE) {
 		if (value & X2APIC_ENABLE) {
 			u32 id = kvm_apic_id(apic);


Patches currently in stable-queue which might be from jan.kiszka@xxxxxxxxxxx are

queue-3.12/kvm-nvmx-unconditionally-uninit-the-mmu-on-nested-vmexit.patch
queue-3.12/kvm-x86-fix-apic-map-calculation-after-re-enabling.patch
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