linux-kernel - [PATCH v4 0/1] KVM: s390: fix a newly introduced bug

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Message-ID: <20250304182304.178746-1-imbrenda@linux.ibm.com>
Date: Tue,  4 Mar 2025 19:23:03 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: kvm@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org,
        frankja@...ux.ibm.com, borntraeger@...ibm.com, david@...hat.com,
        nrb@...ux.ibm.com, seiden@...ux.ibm.com, nsg@...ux.ibm.com,
        schlameuss@...ux.ibm.com, hca@...ux.ibm.com
Subject: [PATCH v4 0/1] KVM: s390: fix a newly introduced bug

Fix race when making a page secure (hold pte lock again)

This should fix the issues I have seen, which I think/hope are also the same
issues that David found.

v3->v4:
* move and rename s390_wiggle_split_folio() to fix a compile issue when
  KVM is not selected
* removed obsolete reference to __() from comments

v2->v3:
* added check for pte_write() in make_hva_secure() [thanks David]

v1->v2:
* major refactoring
* walk the page tables only once
* when importing, manually fault in pages if needed

Claudio Imbrenda (1):
  KVM: s390: pv: fix race when making a page secure

 arch/s390/include/asm/gmap.h |   1 -
 arch/s390/include/asm/uv.h   |   3 +-
 arch/s390/kernel/uv.c        | 135 +++++++++++++++++++++++++++++++++--
 arch/s390/kvm/gmap.c         | 101 ++------------------------
 arch/s390/kvm/kvm-s390.c     |  25 ++++---
 arch/s390/mm/gmap.c          |  28 --------
 6 files changed, 153 insertions(+), 140 deletions(-)

-- 
2.48.1