[Intel-gfx] [PATCH v4 01/29] drm/i915/gvt: Verify pfn is "valid" before dereferencing "struct page"

Check that the pfn found by gfn_to_pfn() is actually backed by "struct page" memory prior to retrieving and dereferencing the page. KVM supports backing guest memory with VM_PFNMAP, VM_IO, etc., and so there is no guarantee the pfn returned by gfn_to_pfn() has an associated "struct page". Fixes:

Re: [Intel-gfx] [PATCH v4 01/29] drm/i915/gvt: Verify pfn is "valid" before dereferencing "struct page"

On 7/29/2023 4:35 AM, Sean Christopherson wrote: Check that the pfn found by gfn_to_pfn() is actually backed by "struct page" memory prior to retrieving and dereferencing the page. KVM supports backing guest memory with VM_PFNMAP, VM_IO, etc., and so there is no guarantee the pfn returned by gfn