On Fri, Mar 13, 2020 at 09:45:15 +0100, Christian Ehrhardt wrote: > On Tue, Mar 10, 2020 at 11:48 AM Christian Ehrhardt < > christian.ehrhardt@xxxxxxxxxxxxx> 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. Sorry, I already started working on this additional patch as I'd like it to be pushed right after yours. But I got distracted by other higher priority things. I hope to finish it and send for a review soon. Jirka
