linux-kernel - Re: [PATCH v5 06/14] KVM: s390: pv: properly handle page flags for protected guests

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Date:   Tue, 26 Oct 2021 13:53:17 +0200
From:   Christian Borntraeger <borntraeger@...ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     cohuck@...hat.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, Ulrich.Weigand@...ibm.com
Subject: Re: [PATCH v5 06/14] KVM: s390: pv: properly handle page flags for
 protected guests

Am 20.09.21 um 15:24 schrieb Claudio Imbrenda:
> Introduce variants of the convert and destroy page functions that also
> clear the PG_arch_1 bit used to mark them as secure pages.
> 
> The PG_arch_1 flag is always allowed to overindicate; using the new
> functions introduced here allows to reduce the extent of overindication
> and thus improve performance.
> 
> These new functions can only be called on pages for which a reference
> is already being held.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> Acked-by: Janosch Frank <frankja@...ux.ibm.com>
> Reviewed-by: Christian Borntraeger <borntraeger@...ibm.com>

applied.