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Message-ID: <ZEpUEF7H86E9vVfS@osiris>
Date:   Thu, 27 Apr 2023 12:53:04 +0200
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, frankja@...ux.ibm.com,
        borntraeger@...ibm.com, nrb@...ux.ibm.com, nsg@...ux.ibm.com,
        seiden@...ux.ibm.com, jgg@...dia.com
Subject: Re: [PATCH v2 1/1] KVM: s390: fix race in gmap_make_secure

On Wed, Apr 26, 2023 at 03:48:34PM +0200, Claudio Imbrenda wrote:
> This patch fixes a potential race in gmap_make_secure and removes the
> last user of follow_page without FOLL_GET.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Suggested-by: Jason Gunthorpe <jgg@...dia.com>
> Fixes: 214d9bbcd3a6 ("s390/mm: provide memory management functions for protected KVM guests")
> ---
>  arch/s390/kernel/uv.c | 32 +++++++++++---------------------
>  1 file changed, 11 insertions(+), 21 deletions(-)

It would be helpful if this would be a bit more descriptive. "Fix
race" is not very helpful :)

What race does this fix?
When can this happen?
What are the consequences if the race window is being hit?

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