diff options
Diffstat (limited to 'kernel/main.c')
| -rw-r--r-- | kernel/main.c | 31 |
1 files changed, 29 insertions, 2 deletions
diff --git a/kernel/main.c b/kernel/main.c index 7001b3d..ca973b0 100644 --- a/kernel/main.c +++ b/kernel/main.c @@ -1285,15 +1285,34 @@ static int nv_vgpu_vfio_dev_mmap(struct vfio_device *vdev, struct vm_area_struct return 0; } - /* BAR2 region - ioremap'd host BAR; map backing physical address */ + /* BAR2 region - emulated shadow (emulation-only) or real BAR (claim) */ region_base = VFIO_PCI_INDEX_TO_OFFSET(VFIO_PCI_BAR2_REGION_INDEX); region_size = vgpu->bars[2].size; if (offset >= region_base && offset < region_base + region_size) { + unsigned long bar2_off = offset - region_base; + unsigned long pos; + if (!vgpu->bars[2].vaddr || region_size == 0) return -ENODEV; if (offset + size > region_base + region_size) return -EINVAL; - pfn = (vgpu->bars[2].gpa + (offset - region_base)) >> PAGE_SHIFT; + if (vgpu->bars[2].emulated) { + /* Emulation-only: map the private shadow's own pages, + * never the physical GPU's BAR2 PFNs. */ + vm_flags_set(vma, VM_DONTEXPAND | VM_DONTDUMP); + vma->vm_page_prot = + pgprot_writecombine(vma->vm_page_prot); + for (pos = 0; pos < size; pos += PAGE_SIZE) { + pfn = vmalloc_to_pfn(vgpu->bars[2].vaddr + + bar2_off + pos); + if (remap_pfn_range(vma, vma->vm_start + pos, + pfn, PAGE_SIZE, + vma->vm_page_prot)) + return -EAGAIN; + } + return 0; + } + pfn = (vgpu->bars[2].gpa + bar2_off) >> 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); } @@ -2643,6 +2662,14 @@ module_param_named(sema_ce_grace_ms, gsp_sema_ce_grace_ms, uint, 0644); MODULE_PARM_DESC(sema_ce_grace_ms, "CE pending-entry grace window in ms (default 8000)"); /* + * Bounded work-before-release hold (ms) for an unreadable CE entry; the + * deferred retry probe shows translations/pins land 0.5-2 s late. Absolute + * per-entry deadline, never reset; 0 disables. + */ +module_param_named(sema_push_hold_ms, gsp_sema_push_hold_ms, uint, 0644); +MODULE_PARM_DESC(sema_push_hold_ms, "CE unreadable-entry work-before-release hold in ms (default 2500, 0 disables)"); + +/* * Grace window (ms) an untranslatable GR entry stays pending before the pump * consumes it as stale, so a late push-buffer pin can still make it readable. */ |