On 07/08/2018 14:51, David Hildenbrand wrote:
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 (while entering the vSIE loop).
This way, we can support blocking and also synchronous CPU requests.
Only compile tested.
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 | 20 ++++++++++++++++++--
4 files changed, 34 insertions(+), 4 deletions(-)
Thanks David for your patches.
Following my tests, they work fine for our AP use case.
Best regards,
Pierre
--
Pierre Morel
Linux/KVM/QEMU in Böblingen - Germany
