linux-kernel - Re: [PATCH v11 13/19] KVM: s390: pv: destroy the configuration before its memory

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Message-ID: <20220608140653.0afd1e75@li-ca45c2cc-336f-11b2-a85c-c6e71de567f1>
Date:   Wed, 8 Jun 2022 14:06:53 +0200
From:   Nico Boehr <nrb@...ux.ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>
Cc:     kvm@...r.kernel.org, borntraeger@...ibm.com, frankja@...ux.ibm.com,
        thuth@...hat.com, pasic@...ux.ibm.com, david@...hat.com,
        linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        scgl@...ux.ibm.com, mimu@...ux.ibm.com
Subject: Re: [PATCH v11 13/19] KVM: s390: pv: destroy the configuration
 before its memory

On Fri,  3 Jun 2022 08:56:39 +0200
Claudio Imbrenda <imbrenda@...ux.ibm.com> wrote:

> Move the Destroy Secure Configuration UVC before the loop to destroy
> the memory. If the protected VM has memory, it will be cleaned up and
> made accessible by the Destroy Secure Configuraion UVC. The struct
> page for the relevant pages will still have the protected bit set, so
> the loop is still needed to clean that up.
> 
> Switching the order of those two operations does not change the
> outcome, but it is significantly faster.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

Reviewed-by: Nico Boehr <nrb@...ux.ibm.com>