linux-kernel - [PATCH v4 0/2] s390/kvm: fix MVPG when in VSIE

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Message-Id: <20210223191353.267981-1-imbrenda@linux.ibm.com>
Date:   Tue, 23 Feb 2021 20:13:51 +0100
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     borntraeger@...ibm.com, frankja@...ux.ibm.com, david@...hat.com,
        cohuck@...hat.com, kvm@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH v4 0/2] s390/kvm: fix MVPG when in VSIE

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.

v3->v4
* added PEI_ prefix to DAT_PROT and NOT_PTE macros
* added small comment to explain what they are about

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 |   6 ++-
 arch/s390/kvm/vsie.c    | 101 ++++++++++++++++++++++++++++++++++++----
 3 files changed, 122 insertions(+), 15 deletions(-)

-- 
2.26.2