diff options
Diffstat (limited to 'virt/kvm/arm/vgic.c')
| -rw-r--r-- | virt/kvm/arm/vgic.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c index 382fb5a88b9c..3aaca49de325 100644 --- a/virt/kvm/arm/vgic.c +++ b/virt/kvm/arm/vgic.c @@ -145,6 +145,20 @@ static void vgic_free_bitmap(struct vgic_bitmap *b) b->shared = NULL; } +/* + * Call this function to convert a u64 value to an unsigned long * bitmask + * in a way that works on both 32-bit and 64-bit LE and BE platforms. + * + * Warning: Calling this function may modify *val. + */ +static unsigned long *u64_to_bitmask(u64 *val) +{ +#if defined(CONFIG_CPU_BIG_ENDIAN) && BITS_PER_LONG == 32 + *val = (*val >> 32) | (*val << 32); +#endif + return (unsigned long *)val; +} + static u32 *vgic_bitmap_get_reg(struct vgic_bitmap *x, int cpuid, u32 offset) { @@ -1442,7 +1456,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu *vcpu) * active bit. */ u64 eisr = vgic_get_eisr(vcpu); - unsigned long *eisr_ptr = (unsigned long *)&eisr; + unsigned long *eisr_ptr = u64_to_bitmask(&eisr); int lr; for_each_set_bit(lr, eisr_ptr, vgic->nr_lr) { @@ -1505,7 +1519,7 @@ static void __kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) level_pending = vgic_process_maintenance(vcpu); elrsr = vgic_get_elrsr(vcpu); - elrsr_ptr = (unsigned long *)&elrsr; + elrsr_ptr = u64_to_bitmask(&elrsr); /* Clear mappings for empty LRs */ for_each_set_bit(lr, elrsr_ptr, vgic->nr_lr) { |