linux-kernel - Re: [PATCH v2 2/2] KVM: s390: pv: fix index value of replaced ASCE

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Message-ID: <20230712140651.37d84e5d@p-imbrenda>
Date:   Wed, 12 Jul 2023 14:06:51 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Janosch Frank <frankja@...ux.ibm.com>
Cc:     kvm@...r.kernel.org, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, mhartmay@...ux.ibm.com,
        nsg@...ux.ibm.com, borntraeger@...ibm.com, nrb@...ux.ibm.com
Subject: Re: [PATCH v2 2/2] KVM: s390: pv: fix index value of replaced ASCE

On Wed, 12 Jul 2023 13:58:49 +0200
Janosch Frank <frankja@...ux.ibm.com> wrote:

> On 7/5/23 13:19, Claudio Imbrenda wrote:
> > The index field of the struct page corresponding to a guest ASCE should
> > be 0. When replacing the ASCE in s390_replace_asce(), the index of the
> > new ASCE should also be set to 0.
> > 
> > Having the wrong index might lead to the wrong addresses being passed
> > around when notifying pte invalidations, and eventually to validity
> > intercepts (VM crash) if the prefix gets unmapped and the notifier gets
> > called with the wrong address.
> > 
> > Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>  
> 
> No fixes tag?

oops, you're right

Fixes: faa2f72cb356 ("KVM: s390: pv: leak the topmost page table when
destroy fails")


> 
> Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>
>