On Fri, 2016-09-02 at 12:02 +0530, Nikunj A Dadhania wrote: > The series is a first attempt at enabling Multi-Threaded TCG on PowerPC. > Changes that were needed to enable PowerPC are pretty simple; > > Patch 01: Take a iothread lock during hcall, as hcall can generate io requests > 02: For TCG, we were harcoding smt as 1, this gets rid of the limitation
If we do this, we need to implement the shared SPRs properly and the inter-thread doorbells... > 03: Use atomic_cmpxchg in store conditional > 04: With more threads, flush the entry from each cpu. > This can be optimized further. > > The patches are based on the Alex Bennee's base enabling patches for > MTTCG[1] and Emilios's cmpxchg atomics. The consolidated tree of the > above patches is here: > > https://github.com/stsquad/qemu/tree/mttcg/base-patches-v4-with-cmpxchg-atomics-v2 > > Apart from the above, PPC patches are based out of ppc-for-2.8 and > load/store consolidation patches [2] > > Series with all dependent patches available here: > https://github.com/nikunjad/qemu/tree/ppc_mttcg_v1 > > Testing: > ======== > > -smp 4,cores=1,threads=4 -accel tcg,thread=multi > > TODO > ==== > Implement msgsndp instructions(door-bell), newer kernels enable it > depending on the PVR. I have been using following workaround to boot. > https://github.com/nikunjad/qemu/commit/2c10052c5f93418a6b920e6ba3ce1813fcf50bc4 > > [1] https://www.mail-archive.com/qemu-devel@nongnu.org/msg391966.html > [2] https://lists.gnu.org/archive/html/qemu-ppc/2016-08/msg00265.html > > Nikunj A Dadhania (4): > spapr-hcall: take iothread lock during handler call > target-ppc: with MTTCG report more threads > target-ppc: use atomic_cmpxchg for ld/st reservation > target-ppc: flush tlb from all the cpu > > cputlb.c | 15 +++++++++++++++ > hw/ppc/spapr_hcall.c | 11 +++++++++-- > include/exec/exec-all.h | 2 ++ > target-ppc/kvm.c | 2 +- > target-ppc/kvm_ppc.h | 2 +- > target-ppc/mmu-hash64.c | 2 +- > target-ppc/translate.c | 24 +++++++++++++++++++++--- > 7 files changed, 50 insertions(+), 8 deletions(-) >
