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KVM: arm/arm64: Extract GICv3 max APRn index calculation

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As we are about to access the APRs from the GICv2 uaccess interface,
make this logic generally available.

Reviewed-by: Marc Zyngier <[email protected]>
Signed-off-by: Christoffer Dall <[email protected]>
This commit is contained in:
Christoffer Dall 2017-09-01 11:41:52 +02:00
commit 50f5bd5718
2 changed files with 19 additions and 20 deletions
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16
virt/kvm/arm/vgic/vgic.h
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@ -220,4 +220,20 @@ int vgic_debug_destroy(struct kvm *kvm);
bool lock_all_vcpus(struct kvm *kvm);
void unlock_all_vcpus(struct kvm *kvm);
static inline int vgic_v3_max_apr_idx(struct kvm_vcpu *vcpu)
{
struct vgic_cpu *cpu_if = &vcpu->arch.vgic_cpu;
/*
* num_pri_bits are initialized with HW supported values.
* We can rely safely on num_pri_bits even if VM has not
* restored ICC_CTLR_EL1 before restoring APnR registers.
*/
switch (cpu_if->num_pri_bits) {
case 7: return 3;
case 6: return 1;
default: return 0;
}
}
#endif