[Bug 203979] kvm_spurious_fault in L1 when running a nested kvm instance on AMD i686-pae

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https://bugzilla.kernel.org/show_bug.cgi?id=203979

--- Comment #2 from Jiri Palecek (jpalecek@xxxxxx) ---
Created attachment 283501
  --> https://bugzilla.kernel.org/attachment.cgi?id=283501&action=edit
Patch that allows me to run nested kvm instances again

After much looking on the offending commit, which doesn't seem to change any
functionality, but just changes the API, I found out the gfns used inside
__kvm_map_gfn were in fact far off. Further looking into it I found that these
gfns were the result of gfn_to_gpa in some (but not all) places that used the
new api. However, what was clearly meant was gpa_to_gfn. So I prepared this
patch and tested that it allows to run nested linux instances in kvm
successfully on my AMD system.

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