diff options
Diffstat (limited to 'arch/powerpc/kvm/book3s_xive_native.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_xive_native.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/book3s_xive_native.c b/arch/powerpc/kvm/book3s_xive_native.c index 2f9d5e9439a6..f5314da0cb45 100644 --- a/arch/powerpc/kvm/book3s_xive_native.c +++ b/arch/powerpc/kvm/book3s_xive_native.c @@ -165,6 +165,44 @@ bail: return rc; } +static vm_fault_t xive_native_tima_fault(struct vm_fault *vmf) +{ + struct vm_area_struct *vma = vmf->vma; + + switch (vmf->pgoff - vma->vm_pgoff) { + case 0: /* HW - forbid access */ + case 1: /* HV - forbid access */ + return VM_FAULT_SIGBUS; + case 2: /* OS */ + vmf_insert_pfn(vma, vmf->address, xive_tima_os >> PAGE_SHIFT); + return VM_FAULT_NOPAGE; + case 3: /* USER - TODO */ + default: + return VM_FAULT_SIGBUS; + } +} + +static const struct vm_operations_struct xive_native_tima_vmops = { + .fault = xive_native_tima_fault, +}; + +static int kvmppc_xive_native_mmap(struct kvm_device *dev, + struct vm_area_struct *vma) +{ + /* We only allow mappings at fixed offset for now */ + if (vma->vm_pgoff == KVM_XIVE_TIMA_PAGE_OFFSET) { + if (vma_pages(vma) > 4) + return -EINVAL; + vma->vm_ops = &xive_native_tima_vmops; + } else { + return -EINVAL; + } + + vma->vm_flags |= VM_IO | VM_PFNMAP; + vma->vm_page_prot = pgprot_noncached_wc(vma->vm_page_prot); + return 0; +} + static int kvmppc_xive_native_set_source(struct kvmppc_xive *xive, long irq, u64 addr) { @@ -1050,6 +1088,7 @@ struct kvm_device_ops kvm_xive_native_ops = { .set_attr = kvmppc_xive_native_set_attr, .get_attr = kvmppc_xive_native_get_attr, .has_attr = kvmppc_xive_native_has_attr, + .mmap = kvmppc_xive_native_mmap, }; void kvmppc_xive_native_init_module(void) |