diff options
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-v3.c')
| -rw-r--r-- | virt/kvm/arm/vgic/vgic-v3.c | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c index 9ae8adddff69..54dee725da18 100644 --- a/virt/kvm/arm/vgic/vgic-v3.c +++ b/virt/kvm/arm/vgic/vgic-v3.c @@ -278,6 +278,57 @@ retry: return 0; } +/** + * vgic_its_save_pending_tables - Save the pending tables into guest RAM + * kvm lock and all vcpu lock must be held + */ +int vgic_v3_save_pending_tables(struct kvm *kvm) +{ + struct vgic_dist *dist = &kvm->arch.vgic; + int last_byte_offset = -1; + struct vgic_irq *irq; + int ret; + + list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) { + int byte_offset, bit_nr; + struct kvm_vcpu *vcpu; + gpa_t pendbase, ptr; + bool stored; + u8 val; + + vcpu = irq->target_vcpu; + if (!vcpu) + continue; + + pendbase = GICR_PENDBASER_ADDRESS(vcpu->arch.vgic_cpu.pendbaser); + + byte_offset = irq->intid / BITS_PER_BYTE; + bit_nr = irq->intid % BITS_PER_BYTE; + ptr = pendbase + byte_offset; + + if (byte_offset != last_byte_offset) { + ret = kvm_read_guest(kvm, ptr, &val, 1); + if (ret) + return ret; + last_byte_offset = byte_offset; + } + + stored = val & (1U << bit_nr); + if (stored == irq->pending_latch) + continue; + + if (irq->pending_latch) + val |= 1 << bit_nr; + else + val &= ~(1 << bit_nr); + + ret = kvm_write_guest(kvm, ptr, &val, 1); + if (ret) + return ret; + } + return 0; +} + /* check for overlapping regions and for regions crossing the end of memory */ static bool vgic_v3_check_base(struct kvm *kvm) { |