linux-kernel - Re: [PATCH v1 1/1] s390/vfio-ap: remove gmap_convert_to_secure from vfio_ap

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Message-ID: <20241119112456.10387-H-hca@linux.ibm.com>
Date: Tue, 19 Nov 2024 12:24:56 +0100
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, akrowiak@...ux.ibm.com,
        pasic@...ux.ibm.com, jjherne@...ux.ibm.com, freude@...ux.ibm.com,
        gor@...ux.ibm.com, agordeev@...ux.ibm.com, borntraeger@...ibm.com,
        svens@...ux.ibm.com, frankja@...ux.ibm.com, nrb@...ux.ibm.com,
        nsg@...ux.ibm.com, seiden@...ux.ibm.com
Subject: Re: [PATCH v1 1/1] s390/vfio-ap: remove gmap_convert_to_secure from
 vfio_ap_ops

On Fri, Nov 15, 2024 at 02:56:11PM +0100, Claudio Imbrenda wrote:
> If the page has been exported, do not re-import it. Imports should
> only be triggered by the guest. The guest will import the page
> automatically when it will need it again, there is no advantage in
> importing it manually.
> 
> Moreover, vfio_pin_pages() will take an extra reference on the page and
> thus will cause the import to always fail. The extra reference would be
> dropped only after pointlessly trying to import the page.
> 
> Fixes: f88fb1335733 ("s390/vfio-ap: make sure nib is shared")
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> ---
>  drivers/s390/crypto/vfio_ap_ops.c | 32 +++++++++++++++++++++----------
>  1 file changed, 22 insertions(+), 10 deletions(-)

Applied, thanks!