Commit 51b00d85 authored by Zhenyu Wang's avatar Zhenyu Wang

drm/i915/gvt: Fix mmap range check

This is to fix missed mmap range check on vGPU bar2 region
and only allow to map vGPU allocated GMADDR range, which means
user space should support sparse mmap to get proper offset for
mmap vGPU aperture. And this takes care of actual pgoff in mmap
request as original code always does from beginning of vGPU

Fixes: 659643f7 ("drm/i915/gvt/kvmgt: add vfio/mdev support to KVMGT")
Cc: "Monroy, Rodrigo Axel" <>
Cc: "Orrala Contreras, Alfredo" <>
Cc: # v4.10+
Reviewed-by: default avatarHang Yuan <>
Signed-off-by: default avatarZhenyu Wang <>
parent 6c2d0f99
......@@ -996,7 +996,7 @@ static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
unsigned int index;
u64 virtaddr;
unsigned long req_size, pgoff = 0;
unsigned long req_size, pgoff, req_start;
pgprot_t pg_prot;
struct intel_vgpu *vgpu = mdev_get_drvdata(mdev);
......@@ -1014,7 +1014,17 @@ static int intel_vgpu_mmap(struct mdev_device *mdev, struct vm_area_struct *vma)
pg_prot = vma->vm_page_prot;
virtaddr = vma->vm_start;
req_size = vma->vm_end - vma->vm_start;
pgoff = vgpu_aperture_pa_base(vgpu) >> PAGE_SHIFT;
pgoff = vma->vm_pgoff &
req_start = pgoff << PAGE_SHIFT;
if (!intel_vgpu_in_aperture(vgpu, req_start))
return -EINVAL;
if (req_start + req_size >
vgpu_aperture_offset(vgpu) + vgpu_aperture_sz(vgpu))
return -EINVAL;
pgoff = (gvt_aperture_pa_base(vgpu->gvt) >> PAGE_SHIFT) + pgoff;
return remap_pfn_range(vma, virtaddr, pgoff, req_size, pg_prot);
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