Re: [PATCH v2 5/5] KVM: PPC: Book3S HV: radix do not clear partition scoped page table when page fault races with other vCPUs.

On Mon, 16 Apr 2018 14:32:40 +1000 Nicholas Piggin wrote: > When running a SMP radix guest, KVM can get into page fault / tlbie > storms -- hundreds of thousands to the same address from different > threads -- due to partition scoped page faults invalidating the > page table entry if it was found

[PATCH v2 5/5] KVM: PPC: Book3S HV: radix do not clear partition scoped page table when page fault races with other vCPUs.

When running a SMP radix guest, KVM can get into page fault / tlbie storms -- hundreds of thousands to the same address from different threads -- due to partition scoped page faults invalidating the page table entry if it was found to be already set up by a racing CPU. What can happen is that gues