mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-01 22:54:01 +00:00
drm/i915/gvt: Verify hugepages are contiguous in physical address space
When shadowing a GTT entry with a 2M page, verify that the pfns are contiguous, not just that the struct page pointers are contiguous. The memory map is virtual contiguous if "CONFIG_FLATMEM=y || CONFIG_SPARSEMEM_VMEMMAP=y", but not for "CONFIG_SPARSEMEM=y && CONFIG_SPARSEMEM_VMEMMAP=n", so theoretically KVMGT could encounter struct pages that are virtually contiguous, but not physically contiguous. In practice, this flaw is likely a non-issue as it would cause functional problems iff a section isn't 2M aligned _and_ is directly adjacent to another section with discontiguous pfns. Tested-by: Yongwei Ma <yongwei.ma@intel.com> Reviewed-by: Zhi Wang <zhi.a.wang@intel.com> Reviewed-by: Yan Zhao <yan.y.zhao@intel.com> Link: https://lore.kernel.org/r/20230729013535.1070024-4-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
parent
1e557c1cd0
commit
adc7b226b7
1 changed files with 1 additions and 1 deletions
|
@ -161,7 +161,7 @@ static int gvt_pin_guest_page(struct intel_vgpu *vgpu, unsigned long gfn,
|
|||
|
||||
if (npage == 0)
|
||||
base_page = cur_page;
|
||||
else if (base_page + npage != cur_page) {
|
||||
else if (page_to_pfn(base_page) + npage != page_to_pfn(cur_page)) {
|
||||
gvt_vgpu_err("The pages are not continuous\n");
|
||||
ret = -EINVAL;
|
||||
npage++;
|
||||
|
|
Loading…
Reference in a new issue