Re: [PATCH v2 1/1] cpu_map: Add more -noTSX x86 CPU models

On Tue, Mar 10, 2020 at 11:48 AM Christian Ehrhardt < christian.ehrhardt(a)canonical.com&gt; wrote: > One of the mitigation methods for TAA[1] is to disable TSX > support on the host system. Linux added a mechanism to disable > TSX globally through the kernel command line, and many Linux > distributions now default to tsx=off. This makes existing CPU > models that have HLE and RTM enabled not usable anymore. > > Add new versions of all CPU models that have the HLE and RTM > features enabled, that can be used when TSX is disabled in the > host system. > > On systems disabling the features without those types defined > in cpu-maps users end up without modern CPU types in the list > of usable CPUs to use in the likes of virsh domcapabilities > or tools higher in the stack like virt-manager. > > This adds: > -Cascadelake-Server-noTSX > -Icelake-Client-noTSX > -Icelake-Server-noTSX > -Skylake-Server-noTSX-IBRS > -Skylake-Client-noTSX-IBRS > > Introduced in QEMU by commit v4.2.0-rc2-3-g9ab2237f19 (function) > and commit v4.2.0-rc2-4-g02fa60d101 (names) > Ping - anything else that we need for this v2 right now to accept it? I know in the long run Jiri would want to auto-select the non noTSX types. But as I outlined before I'd consider this a later change or would need some guidance where/how it is envisioned to do tat preference.