On Thu Jan 19, 2023 at 6:57 AM CET, Xiaoyao Li wrote: > Set aside how user space VMM emulate these 2 MSRs correctly, it can > request the MSR READ to exit to user space via KVM_X86_SET_MSR_FILTER. > So user space VMM can just enable the read filter of these 2 MSRs and > provide the emulation itself. Thanks for your feedback. I totally miss out on this possibility. On Qemu, only one msr is using it (MSR_CORE_THREAD_COUNT). I did a test yesterday in Qemu adding a filter with kvm_filter_msr() and a callback to setup the msr with a dummy value and it's perfectly working.
