Messages in this thread | | | From | David Hildenbrand <> | Subject | [PATCH v1 0/2] KVM: s390: vsie: simulate VCPU SIE entry/exit | Date | Thu, 9 Aug 2018 10:05:59 +0200 |
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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
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