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Subject: Re: [PATCH RFC 1/2] KVM: s390: vsie: simulate VCPU SIE entry/exit
To:     David Hildenbrand <david@redhat.com>, linux-kernel@vger.kernel.org
Cc:     linux-s390@vger.kernel.org,
        Heiko Carstens <heiko.carstens@de.ibm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Cornelia Huck <cohuck@redhat.com>,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Pierre Morel <pmorel@linux.ibm.com>
References: <20180807125131.3606-1-david@redhat.com>
 <20180807125131.3606-2-david@redhat.com>
From:   Janosch Frank <frankja@linux.ibm.com>
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Date:   Thu, 9 Aug 2018 07:38:09 +0200
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From: Janosch Frank <frankja@linux.ibm.com>
To: David Hildenbrand <david@redhat.com>, linux-kernel@vger.kernel.org
Cc: linux-s390@vger.kernel.org, Heiko Carstens <heiko.carstens@de.ibm.com>,
 Martin Schwidefsky <schwidefsky@de.ibm.com>,
 Cornelia Huck <cohuck@redhat.com>,
 Christian Borntraeger <borntraeger@de.ibm.com>,
 Pierre Morel <pmorel@linux.ibm.com>
Message-ID: <baab41cb-46fe-9335-9481-5fdb35b6f7e3@linux.ibm.com>
Subject: Re: [PATCH RFC 1/2] KVM: s390: vsie: simulate VCPU SIE entry/exit
References: <20180807125131.3606-1-david@redhat.com>
 <20180807125131.3606-2-david@redhat.com>
In-Reply-To: <20180807125131.3606-2-david@redhat.com>

--EQ9E38gnVc3AMZClXlVXFj4VlAsXZ7lnv
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On 07.08.2018 14:51, David Hildenbrand wrote:
> VCPU requests and VCPU blocking right now don't take care of the vSIE
> (as it was not necessary until now). But we want to have VCPU requests
> that will also be handled before running the vSIE again.
>=20
> So let's simulate a SIE entry when entering the vSIE loop and check
> for PROG_ flags. The existing infrastructure (e.g. exit_sie()) will the=
n
> detect that the SIE (in form of the vSIE execution loop) is running and=

> properly kick the vSIE CPU, resulting in it leaving the vSIE loop and
> therefore the vSIE interception handler, allowing it to handle VCPU
> requests.
>=20
> E.g. if we want to modify the crycb of the VCPU and make sure that any
> masks also get applied to the VSIE crycb shadow (which uses masks from =
the
> VCPU crycb), we will need a way to hinder the vSIE from running and mak=
e
> sure to process the updated crycb before reentering the vSIE again.
>=20
> Signed-off-by: David Hildenbrand <david@redhat.com>

Finally found some time:
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>

As the first user will be AP, I guess the patches will be queued with
them. Thanks for helping out :)


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