linux-kernel - Re: [PATCH v7 01/17] KVM: s390: pv: leak the topmost page table when destroy fails

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Message-ID: <YgEtq1i3K3ZkPpEX@osiris>
Date:   Mon, 7 Feb 2022 15:33:15 +0100
From:   Heiko Carstens <hca@...ux.ibm.com>
To:     Janosch Frank <frankja@...ux.ibm.com>
Cc:     Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org,
        borntraeger@...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
Subject: Re: [PATCH v7 01/17] KVM: s390: pv: leak the topmost page table when
 destroy fails

> > +	asce = (gmap->asce & ~PAGE_MASK) | __pa(table);
> 
> Please add a comment:
> Set the new table origin while preserving ASCE control bits like table type
> and length.

And while touching this anyway, please make use of _ASCE_ORIGIN
instead of PAGE_MASK.