linux-kernel - [PATCH v1 0/4] KVM: s390: vsie: vsie page handling fixes + rework

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Message-ID: <20250107154344.1003072-1-david@redhat.com>
Date: Tue,  7 Jan 2025 16:43:40 +0100
From: David Hildenbrand <david@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: kvm@...r.kernel.org,
	linux-s390@...r.kernel.org,
	David Hildenbrand <david@...hat.com>,
	Christian Borntraeger <borntraeger@...ux.ibm.com>,
	Janosch Frank <frankja@...ux.ibm.com>,
	Claudio Imbrenda <imbrenda@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Vasily Gorbik <gor@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Sven Schnelle <svens@...ux.ibm.com>,
	Thomas Huth <thuth@...hat.com>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>
Subject: [PATCH v1 0/4] KVM: s390: vsie: vsie page handling fixes + rework

We want to get rid of page->index, so let's make vsie code stop using it
for the vsie page.

While at it, also remove the usage of page refcount, so we can stop messing
with "struct page" completely.

... of course, looking at this code after quite some years, I found some
corner cases that should be fixed.

Briefly sanity tested with kvm-unit-tests running inside a KVM VM, and
nothing blew up.

Cc: Christian Borntraeger <borntraeger@...ux.ibm.com>
Cc: Janosch Frank <frankja@...ux.ibm.com>
Cc: Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>
Cc: Thomas Huth <thuth@...hat.com>
Cc: Matthew Wilcox (Oracle) <willy@...radead.org>

David Hildenbrand (4):
  KVM: s390: vsie: fix some corner-cases when grabbing vsie pages
  KVM: s390: vsie: stop using page->index
  KVM: s390: vsie: stop messing with page refcount
  KVM: s390: vsie: stop using "struct page" for vsie page

 arch/s390/include/asm/kvm_host.h |   4 +-
 arch/s390/kvm/vsie.c             | 104 ++++++++++++++++++++-----------
 2 files changed, 69 insertions(+), 39 deletions(-)


base-commit: fbfd64d25c7af3b8695201ebc85efe90be28c5a3
-- 
2.47.1