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| author | Christoffer Dall <cdall@linaro.org> | 2017-09-01 11:41:52 +0200 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-09-05 17:33:39 +0200 |
| commit | 50f5bd5718df9e71d1f4ba69a6480dbad54b2f24 (patch) | |
| tree | f535a6172455ef91c6327acbb0bf8fd663e79630 /virt | |
| parent | 7c7d2fa1cd1e9aa9b925bac409e91544eee52c03 (diff) | |
| download | linux-stable-50f5bd5718df9e71d1f4ba69a6480dbad54b2f24.tar.gz linux-stable-50f5bd5718df9e71d1f4ba69a6480dbad54b2f24.tar.bz2 linux-stable-50f5bd5718df9e71d1f4ba69a6480dbad54b2f24.zip | |
KVM: arm/arm64: Extract GICv3 max APRn index calculation
As we are about to access the APRs from the GICv2 uaccess interface,
make this logic generally available.
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic.h | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h index bba7fa22a7f7..bf9ceab67c77 100644 --- a/virt/kvm/arm/vgic/vgic.h +++ b/virt/kvm/arm/vgic/vgic.h @@ -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 |