Thank you, that helped!
I checked that 0x122 corresponds with a new MSR introduced by Intel to disable
TSX, called MSR_IA32_TSX_CTRL . I have also found that in kernel 5.5 there's
been a series of changes to hard-disable TSX inside KVM guests with
MSR_IA32_TSX_CTRL (merged to mainline in
El vie., 30 oct. 2020 a las 23:56, Bronek Kozicki
() escribió:
>
> I recently tried upgrading from vanilla LTS kernel 5.4 to vanilla 5.8 and
> found that my virtual machines "stutter" when they did not previously. The
> hypervisor is configured with tickless kernel (NO_HZ_FULL) and physical
I recently tried upgrading from vanilla LTS kernel 5.4 to vanilla 5.8 and found
that my virtual machines "stutter" when they did not previously. The hypervisor
is configured with tickless kernel (NO_HZ_FULL) and physical cores are
exclusively reserved for vcpus by means of isolcpus , nohz_full
