On 04/05/21 10:15, Denis V. Lunev wrote:
As far as I understand only some testing within kernel now. Though we have plans to expose it for QAPI as the series in QEMU [PATCH 1/2] qapi: fix error handling for x-vz-query-cpu-model-cpuid [PATCH 2/2] qapi: blacklisted x-vz-query-cpu-model-cpuid in tests is not coming in a good way. The idea was to avoid manual code rework in QEMU and expose collected model at least for debug.
KVM_GET_CPUID2 as a VM ioctl cannot expose the whole truth about CPUID either, since it doesn't handle the TSX_CTRL_CPUID_CLEAR bit. Given that QEMU doesn't need KVM_GET_CPUID2; it only needs to save whatever it passed to KVM_SET_CPUID2.
Paolo
