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 -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
