diff options
Diffstat (limited to 'virt/kvm/arm/hyp/vgic-v2-sr.c')
| -rw-r--r-- | virt/kvm/arm/hyp/vgic-v2-sr.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/virt/kvm/arm/hyp/vgic-v2-sr.c b/virt/kvm/arm/hyp/vgic-v2-sr.c index 7cffd9338c49..c8aeb7b91ec8 100644 --- a/virt/kvm/arm/hyp/vgic-v2-sr.c +++ b/virt/kvm/arm/hyp/vgic-v2-sr.c @@ -19,6 +19,7 @@ #include <linux/irqchip/arm-gic.h> #include <linux/kvm_host.h> +#include <asm/kvm_emulate.h> #include <asm/kvm_hyp.h> static void __hyp_text save_maint_int_state(struct kvm_vcpu *vcpu, @@ -167,3 +168,59 @@ void __hyp_text __vgic_v2_restore_state(struct kvm_vcpu *vcpu) writel_relaxed(cpu_if->vgic_vmcr, base + GICH_VMCR); vcpu->arch.vgic_cpu.live_lrs = live_lrs; } + +#ifdef CONFIG_ARM64 +/* + * __vgic_v2_perform_cpuif_access -- perform a GICV access on behalf of the + * guest. + * + * @vcpu: the offending vcpu + * + * Returns: + * 1: GICV access successfully performed + * 0: Not a GICV access + * -1: Illegal GICV access + */ +int __hyp_text __vgic_v2_perform_cpuif_access(struct kvm_vcpu *vcpu) +{ + struct kvm *kvm = kern_hyp_va(vcpu->kvm); + struct vgic_dist *vgic = &kvm->arch.vgic; + phys_addr_t fault_ipa; + void __iomem *addr; + int rd; + + /* Build the full address */ + fault_ipa = kvm_vcpu_get_fault_ipa(vcpu); + fault_ipa |= kvm_vcpu_get_hfar(vcpu) & GENMASK(11, 0); + + /* If not for GICV, move on */ + if (fault_ipa < vgic->vgic_cpu_base || + fault_ipa >= (vgic->vgic_cpu_base + KVM_VGIC_V2_CPU_SIZE)) + return 0; + + /* Reject anything but a 32bit access */ + if (kvm_vcpu_dabt_get_as(vcpu) != sizeof(u32)) + return -1; + + /* Not aligned? Don't bother */ + if (fault_ipa & 3) + return -1; + + rd = kvm_vcpu_dabt_get_rd(vcpu); + addr = kern_hyp_va((kern_hyp_va(&kvm_vgic_global_state))->vcpu_base_va); + addr += fault_ipa - vgic->vgic_cpu_base; + + if (kvm_vcpu_dabt_iswrite(vcpu)) { + u32 data = vcpu_data_guest_to_host(vcpu, + vcpu_get_reg(vcpu, rd), + sizeof(u32)); + writel_relaxed(data, addr); + } else { + u32 data = readl_relaxed(addr); + vcpu_set_reg(vcpu, rd, vcpu_data_host_to_guest(vcpu, data, + sizeof(u32))); + } + + return 1; +} +#endif |