diff options
Diffstat (limited to 'virt/kvm/arm/vgic/vgic.c')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic.c | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index 8201899126f6..e74baec76361 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -19,6 +19,7 @@ #include <linux/list_sort.h> #include <linux/interrupt.h> #include <linux/irq.h> +#include <asm/kvm_hyp.h> #include "vgic.h" @@ -808,6 +809,24 @@ static void vgic_flush_lr_state(struct kvm_vcpu *vcpu) vgic_clear_lr(vcpu, count); } +static inline bool can_access_vgic_from_kernel(void) +{ + /* + * GICv2 can always be accessed from the kernel because it is + * memory-mapped, and VHE systems can access GICv3 EL2 system + * registers. + */ + return !static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif) || has_vhe(); +} + +static inline void vgic_save_state(struct kvm_vcpu *vcpu) +{ + if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + vgic_v2_save_state(vcpu); + else + __vgic_v3_save_state(vcpu); +} + /* Sync back the hardware VGIC state into our emulation after a guest's run. */ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) { @@ -819,11 +838,22 @@ void kvm_vgic_sync_hwstate(struct kvm_vcpu *vcpu) if (list_empty(&vcpu->arch.vgic_cpu.ap_list_head)) return; + if (can_access_vgic_from_kernel()) + vgic_save_state(vcpu); + if (vgic_cpu->used_lrs) vgic_fold_lr_state(vcpu); vgic_prune_ap_list(vcpu); } +static inline void vgic_restore_state(struct kvm_vcpu *vcpu) +{ + if (!static_branch_unlikely(&kvm_vgic_global_state.gicv3_cpuif)) + vgic_v2_restore_state(vcpu); + else + __vgic_v3_restore_state(vcpu); +} + /* Flush our emulation state into the GIC hardware before entering the guest. */ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) { @@ -846,6 +876,9 @@ void kvm_vgic_flush_hwstate(struct kvm_vcpu *vcpu) spin_lock(&vcpu->arch.vgic_cpu.ap_list_lock); vgic_flush_lr_state(vcpu); spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock); + + if (can_access_vgic_from_kernel()) + vgic_restore_state(vcpu); } void kvm_vgic_load(struct kvm_vcpu *vcpu) |