On 10/03/21 16:51, Marc Zyngier wrote:
+ kvm_for_each_vcpu(j, vcpu, kvm) { + pdata = data + VM_STAT_COUNT; + for (i = 0; i < VCPU_STAT_COUNT; i++, pdata++) + *pdata += *((u64 *)&vcpu->stat + i);Do you really need the in-kernel copy? Why not directly organise the data structures in a way that would allow a bulk copy using copy_to_user()?
The result is built by summing per-vCPU counters, so that the counter updates are fast and do not require a lock. So consistency basically cannot be guaranteed.
Paolo
