This is a note to let you know that I've just added the patch titled
arm/arm64: KVM: vgic: Check for !irqchip_in_kernel() when mapping resources
to the 4.2-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:
arm-arm64-kvm-vgic-check-for-irqchip_in_kernel-when-mapping-resources.patch
and it can be found in the queue-4.2 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From c2f58514cfb374d5368c9da945f1765cd48eb0da Mon Sep 17 00:00:00 2001
From: Pavel Fedin <p.fedin@xxxxxxxxxxx>
Date: Wed, 5 Aug 2015 11:53:57 +0100
Subject: arm/arm64: KVM: vgic: Check for !irqchip_in_kernel() when mapping resources
From: Pavel Fedin <p.fedin@xxxxxxxxxxx>
commit c2f58514cfb374d5368c9da945f1765cd48eb0da upstream.
Until b26e5fdac43c ("arm/arm64: KVM: introduce per-VM ops"),
kvm_vgic_map_resources() used to include a check on irqchip_in_kernel(),
and vgic_v2_map_resources() still has it.
But now vm_ops are not initialized until we call kvm_vgic_create().
Therefore kvm_vgic_map_resources() can being called without a VGIC,
and we die because vm_ops.map_resources is NULL.
Fixing this restores QEMU's kernel-irqchip=off option to a working state,
allowing to use GIC emulation in userspace.
Fixes: b26e5fdac43c ("arm/arm64: KVM: introduce per-VM ops")
Signed-off-by: Pavel Fedin <p.fedin@xxxxxxxxxxx>
[maz: reworked commit message]
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm/kvm/arm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -449,7 +449,7 @@ static int kvm_vcpu_first_run_init(struc
* Map the VGIC hardware resources before running a vcpu the first
* time on this VM.
*/
- if (unlikely(!vgic_ready(kvm))) {
+ if (unlikely(irqchip_in_kernel(kvm) && !vgic_ready(kvm))) {
ret = kvm_vgic_map_resources(kvm);
if (ret)
return ret;
Patches currently in stable-queue which might be from p.fedin@xxxxxxxxxxx are
queue-4.2/arm-arm64-kvm-vgic-check-for-irqchip_in_kernel-when-mapping-resources.patch
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