On 07/08/2017 10:56, Ladi Prosek wrote: > This is the QEMU part of the changes required for nested Hyper-V to read > timestamps with RDTSC + TSC page. Without exposing the frequency MSRs, > Windows with the Hyper-V role enabled use the much slower > HV_X64_MSR_TIME_REF_COUNT (0x40000020) RDMSR to read timestamps. > > The new registers are exposed only if the TSC frequency is stable across > migration and known, as suggested by Paolo. > > v1->v2: > * deleted an extra empty line in patch 1 > * added patch 3 introducing a helper function for the "TSC is stable and > known" check (David) > > Ladi Prosek (4): > i386/kvm: use a switch statement for MSR detection > i386/kvm: set tsc_khz before configuring Hyper-V CPUID > i386/kvm: introduce tsc_is_stable_and_known() > i386/kvm: advertise Hyper-V frequency MSRs > > target/i386/kvm.c | 138 ++++++++++++++++++++++++++++-------------------------- > 1 file changed, 71 insertions(+), 67 deletions(-) > Queued, thanks. Paolo
