[v3,0/2] s390/kvm: fix MVPG when in VSIE

Message

Claudio Imbrenda Feb. 9, 2021, 3:43 p.m. UTC

The current handling of the MVPG instruction when executed in a nested
guest is wrong, and can lead to the nested guest hanging.

This patchset fixes the behaviour to be more architecturally correct,
and fixes the hangs observed.

v2->v3
* improved some comments
* improved some variable and parameter names for increased readability
* fixed missing handling of page faults in the MVPG handler
* small readability improvements

v1->v2
* complete rewrite

Claudio Imbrenda (2):
  s390/kvm: extend kvm_s390_shadow_fault to return entry pointer
  s390/kvm: VSIE: correctly handle MVPG when in VSIE

 arch/s390/kvm/gaccess.c |  30 ++++++++++--
 arch/s390/kvm/gaccess.h |   5 +-
 arch/s390/kvm/vsie.c    | 101 ++++++++++++++++++++++++++++++++++++----
 3 files changed, 121 insertions(+), 15 deletions(-)