diff options
Diffstat (limited to 'kernel/main.c')
| -rw-r--r-- | kernel/main.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/kernel/main.c b/kernel/main.c index 5e99881..f37be6e 100644 --- a/kernel/main.c +++ b/kernel/main.c @@ -1180,17 +1180,28 @@ static int nv_vgpu_vfio_dev_mmap(struct vfio_device *vdev, struct vm_area_struct return remap_pfn_range(vma, vma->vm_start, pfn, size, vma->vm_page_prot); } - /* BAR3 region - ioremap'd host BAR; map backing physical address */ + /* BAR3 region - emulated shadow buffer (not physical GPU BAR) */ region_base = VFIO_PCI_INDEX_TO_OFFSET(VFIO_PCI_BAR3_REGION_INDEX); region_size = vgpu->bars[3].size; if (offset >= region_base && offset < region_base + region_size) { + unsigned long bar3_off = offset - region_base; + unsigned long pos; + if (!vgpu->bars[3].vaddr || region_size == 0) return -ENODEV; if (offset + size > region_base + region_size) return -EINVAL; - pfn = (vgpu->bars[3].gpa + (offset - region_base)) >> PAGE_SHIFT; - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); - return remap_pfn_range(vma, vma->vm_start, pfn, size, vma->vm_page_prot); + /* BAR3 shadow is vzalloc'd: per-page vmalloc_to_pfn like BAR0 shadow. + * Guest BAR3 accesses hit our clean host-RAM backing, not the + * host GPU's real instance memory aperture. */ + vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); + for (pos = 0; pos < size; pos += PAGE_SIZE) { + pfn = vmalloc_to_pfn(vgpu->bars[3].vaddr + bar3_off + pos); + if (remap_pfn_range(vma, vma->vm_start + pos, pfn, PAGE_SIZE, + vma->vm_page_prot)) + return -EAGAIN; + } + return 0; } /* BAR4 region - map backing physical address if present */ |