[Qemu-devel] [Bug 1735049] Re: Need MTTCG support for x86 guests

[Emilio G. Cota]

Patches are now on the list to enable MTTCG for i386 and x86_64 guests.
See v2 here:

https://lists.gnu.org/archive/html/qemu-devel/2018-09/msg00237.html

I'm hoping these patches will be in the next QEMU release.

Regarding your last question:
> For instance, has support for strong-on-weak memory consistency been added 
> into QEMU GIT at this point?

Yes, TCG inserts the appropriate barriers around memory accesses since
commit b32dc3370a ("tcg: Implement implicit ordering semantics",
2017-09-05)

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https://bugs.launchpad.net/bugs/1735049

Title:
  Need MTTCG support for x86 guests

Status in QEMU:
  In Progress

Bug description:
  MTTCG support is notably absent for x86_64 guests.  The last Wiki
  update on MTTCG was back in 2015, and I am having some difficulty
  determining the current status of the underlying requirements to
  enable this feature on x86 hosts.

  For instance, has support for strong-on-weak memory consistency been
  added into QEMU GIT at this point?

  Thanks!

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