linux-kernel - [PATCH v1 0/2] KVM: s390: vsie: simulate VCPU SIE entry/exit

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Message-Id: <20180809080601.31797-1-david@redhat.com>
Date:   Thu,  9 Aug 2018 10:05:59 +0200
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-s390@...r.kernel.org,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Cornelia Huck <cohuck@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Pierre Morel <pmorel@...ux.ibm.com>
Subject: [PATCH v1 0/2] KVM: s390: vsie: simulate VCPU SIE entry/exit

While discussing AP changes, we discovered that we will have to force
a CPU using the vSIE to regenerate/reload shadow data structures. For now,
we have no mechanism for that.

E.g. when clearing AP masks later, we could still have a vSIE CPU making
use of AP adapters as the masks might not be considered yet in the vSIE
data structures. We need a way to block entering the vSIE and regenerate
all shadow data structures once done.

Looks like we can achieve that by simply simulating an ordinary SIE
entry/exit in the VCPU sie control block (when executing sie64 in context
of the vSIE).

This way, we can support blocking and also synchronous CPU requests.

Only compile tested.

RFC -> v1:
- Move entry/exit simulation right to the sie64 code to minimize latency
- Added R-b's, dropped Tested-by.

David Hildenbrand (2):
  KVM: s390: vsie: simulate VCPU SIE entry/exit
  KVM: s390: introduce and use KVM_REQ_VSIE_RESTART

 arch/s390/include/asm/kvm_host.h |  1 +
 arch/s390/kvm/kvm-s390.c         | 16 ++++++++++++++--
 arch/s390/kvm/kvm-s390.h         |  1 +
 arch/s390/kvm/vsie.c             | 21 +++++++++++++++++----
 4 files changed, 33 insertions(+), 6 deletions(-)

-- 
2.17.1