* Add a warning when memory encryption conversions fail. These

Browse source

operations require VMM cooperation, even in CoCo environments
    where the VMM is untrusted.  While it's _possible_ that memory
    pressure could trigger the new warning, the odds are that a
    guest would only see this from an attacking VMM.
  * Simplify page fault code by re-enabling interrupts unconditionally
  * Avoid truncation issues when pfns are passed in to
    pfn_to_kaddr() with small (<64-bit) types.
 -----BEGIN PGP SIGNATURE-----
 
 iQIzBAABCgAdFiEEV76QKkVc4xCGURexaDWVMHDJkrAFAmXvPnEACgkQaDWVMHDJ
 krAP/RAArzmgZ4TkOSMxVi8nIB45Fd5f9HVhw7cK69hkdTA+WdH7JrAfyNAyzA7S
 NZdFk6gmp2HUpe+GmipQ3le1UJgCrNZyXvGYU3capm9O1Ql9BOl7htTpoCxCwwDr
 RRRKnTcRKPKjAU1pX9eTvJGFBKl4UgYgliVMMhrIdgsExJxacSYiHm1C7BLprWVI
 VBfnf3qAolW+zK4RnJD6uqrm4Xzq/WkZiMlpEP/whBy8AhbffwYho+12a7j3fCtM
 j9K6fqvuh3U3XsVn9jOHFeS0NcPdBDBxrN21yD9CtsFA8cKcuJXeO0D7XqlGBvIj
 TlHJz1YByRyWXP92MI2SQ9DBhE21pAiaWEGHz35z0XR6BcTyiLggI2DjVhFkKURg
 aLBbrd0qG6PRefvz13SOmGTa87OJusgzXdX7FKvyMtGC7hEBf9zQo+E+JEog+mQ1
 sqaCWXEC3Oc2WZPeUbLRKw1Q0w0CIZJznu1vtYOOt3iZllvS4RPZMauTFw7iQtVb
 CKmGy7zWqpchQ75ZsXgU1Exhw8/NnrBL/SsfdfRIG9Bn3laUcEwlRXFf/IgPOFbF
 dZfd0UJoriIbGw5Zz8ZxVIl9qsB8UdWSZNOlMQe0nswH75L1FWysqA+jwgdMdgm6
 /jahkn6oVfj4Eu71GNYkEUIEatdoiI9KpbyteLHUTPQwUspz6gc=
 =4QdP
 -----END PGP SIGNATURE-----

Merge tag 'x86_mm_for_6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 mm updates from Dave Hansen:

 - Add a warning when memory encryption conversions fail. These
   operations require VMM cooperation, even in CoCo environments where
   the VMM is untrusted. While it's _possible_ that memory pressure
   could trigger the new warning, the odds are that a guest would only
   see this from an attacking VMM.

 - Simplify page fault code by re-enabling interrupts unconditionally

 - Avoid truncation issues when pfns are passed in to pfn_to_kaddr()
   with small (<64-bit) types.

* tag 'x86_mm_for_6.9' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/mm/cpa: Warn for set_memory_XXcrypted() VMM fails
  x86/mm: Get rid of conditional IF flag handling in page fault path
  x86/mm: Ensure input to pfn_to_kaddr() is treated as a 64-bit type

...

This commit is contained in:

Linus Torvalds 2024-03-11 20:07:52 -07:00

parent 685d982112 82ace18501

commit 555b684190

3 changed files with 32 additions and 20 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

6

arch/x86/include/asm/page.h

View file

27

arch/x86/mm/fault.c

View file

21

arch/x86/mm/pat/set_memory.c

View file