A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 19:21:31 -04:00
Code Issues Projects Releases Packages Wiki Activity

arm64: KVM: Use static keys for selecting the GIC backend

Browse source 
Currently GIC backend is selected via alternative framework and this
is fine. We are going to introduce vgic-v3 to 32-bit world and there
we don't have patching framework in hand, so we can either check
support for GICv3 every time we need to choose which backend to use or
try to optimise it by using static keys. The later looks quite
promising because we can share logic involved in selecting GIC backend
between architectures if both uses static keys.

This patch moves arm64 from alternative to static keys framework for
selecting GIC backend. For that we embed static key into vgic_global
and enable the key during vgic initialisation based on what has
already been exposed by the host GIC driver.

Acked-by: Marc Zyngier <[email protected]>
Signed-off-by: Vladimir Murzin <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Vladimir Murzin 2016-09-12 15:49:15 +01:00 • committed by Christoffer Dall
commit 5a7a8426b2
4 changed files with 20 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

4
virt/kvm/arm/vgic/vgic-init.c
View file

@ -405,6 +405,10 @@ int kvm_vgic_hyp_init(void)
break;
case GIC_V3:
ret = vgic_v3_probe(gic_kvm_info);
if (!ret) {
static_branch_enable(&kvm_vgic_global_state.gicv3_cpuif);
kvm_info("GIC system register CPU interface enabled\n");
}
break;
default:
ret = -ENODEV;

2
virt/kvm/arm/vgic/vgic.c
View file

@ -29,7 +29,7 @@
#define DEBUG_SPINLOCK_BUG_ON(p)
#endif
struct vgic_global __section(.hyp.text) kvm_vgic_global_state;
struct vgic_global __section(.hyp.text) kvm_vgic_global_state = {.gicv3_cpuif = STATIC_KEY_FALSE_INIT,};
/*
* Locking order is always: