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

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Message-ID: <20250108192117.51a2d2cb@p-imbrenda>
Date: Wed, 8 Jan 2025 19:21:17 +0100
From: Claudio Imbrenda <imbrenda@...ux.ibm.com>
To: David Hildenbrand <david@...hat.com>
Cc: linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org,
        Christian Borntraeger
 <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...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: Re: [PATCH v1 0/4] KVM: s390: vsie: vsie page handling fixes +
 rework

On Tue,  7 Jan 2025 16:43:40 +0100
David Hildenbrand <david@...hat.com> wrote:

> 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.

I like this! (aside from a very tiny nit in patch 4)

if a v2 is not needed, I'll put the split line in patch 4 back together
myself when picking, no need to send a v2 just for that.

whole series:
Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

> 
> 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