[Qemu-devel] [PATCH v4 0/2] targte-i386: Add virtual L3 cache support

["Longpeng(Mike)" <longpeng2@huawei.com>]

This patchset add virtual L3 cache support. 

For KVM's linux guest, this will reduces amouts of IPIs under some workloads.
In our experiments(vm:1*socket,8*cores,2threads workload:SAP-HANA-PB-testsuite),
this reduces 85% guest's resched-IPIs, and the performance improves 7.2%~33.1%.

---
Changes since v3:
  - add 2.8 machine: because 2.7 was released.
  - makes the commit message more clearly.

Changes since v2:
  - add more useful commit mesage.
  - rename "compat-cache" to "l3-cache-shared".

Changes since v1:
  - fix the compat problem: set compat_props on PC_COMPAT_2_7.
  - fix a "intentionally introducde bug": make intel's and amd's consistently.
  - fix the CPUID.(EAX=4, ECX=3):EAX[25:14].
  - test the performance if vcpus running on sparate sockets: with L3 cache,
    the performance improves 7.2%~33.1%(avg: 15.7%).

---
Longpeng(Mike) (2):
  pc: Add 2.8 machine
  target-i386: present virtual L3 cache info for vcpus

 hw/i386/pc_piix.c    | 17 ++++++++++++++---
 hw/i386/pc_q35.c     | 16 +++++++++++++---
 include/hw/compat.h  |  2 ++
 include/hw/i386/pc.h | 12 ++++++++++++
 target-i386/cpu.c    | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
 target-i386/cpu.h    |  6 ++++++
 6 files changed, 91 insertions(+), 11 deletions(-)

-- 
1.8.3.1