mbox series

[0/4] Xen on Hyper-V: Implement L0 assisted TLB flush

Message ID 20200212160918.18470-1-liuwe@microsoft.com (mailing list archive)
Headers show
Series Xen on Hyper-V: Implement L0 assisted TLB flush | expand

Message

Wei Liu Feb. 12, 2020, 4:09 p.m. UTC 
Hi all

This seris is based on Roger's L0 assisted flush series.

I have done some testing against a Linux on Hyper-V in a 32-vcpu VM.
All builds were done with -j32.



Building Xen on Linux:
real    0m45.376s
user    2m28.156s
sys     0m51.672s

Building Xen on Linux on Xen on Hyper-V, no assisted flush:
real    3m8.762s
user    10m46.787s
sys     30m14.492s

Building Xen on Linux on Xen on Hyper-V, with assisted flush:
real    0m44.369s
user    3m16.231s
sys     3m3.330s



Building Linux x86_64_defconfig on Linux:
real    0m59.698s
user    21m14.014s
sys     2m58.742s

Building Linux x86_64_defconfig on Linux on Xen on Hyper-V, no assisted
flush:
real    2m6.284s
user    31m18.706s
sys     20m31.106s

Building Linux x86_64_defconfig on Linux on Xen on Hyper-V, with assisted
flush:
real    1m38.968s
user    28m40.398s
sys     11m20.151s



There are various degrees of improvement depending on the workload. Xen
can perhaps be optmised a bit more because it currently doesn't pass the
address space id (cr3) to Hyper-V, but that requires reworking TLB flush
APIs within Xen.

Wei.

Cc: Jan Beulich <jbeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Wei Liu <wl@xen.org>
Cc: Roger Pau Monné <roger.pau@citrix.com>
Cc: Michael Kelley <mikelley@microsoft.com>
Cc: Paul Durrant <pdurrant@amazon.com>

Wei Liu (4):
  x86/hyperv: misc cleanup
  x86/hypervisor: pass flags to hypervisor_flush_tlb
  x86/hyperv: skeleton for L0 assisted TLB flush
  x86/hyperv: L0 assisted TLB flush

 xen/arch/x86/guest/hyperv/Makefile       |   2 +
 xen/arch/x86/guest/hyperv/hyperv.c       |  19 +-
 xen/arch/x86/guest/hyperv/private.h      |  15 +-
 xen/arch/x86/guest/hyperv/tlb.c          | 211 +++++++++++++++++++++++
 xen/arch/x86/guest/hyperv/util.c         |  72 ++++++++
 xen/arch/x86/guest/hypervisor.c          |   4 +-
 xen/arch/x86/guest/xen/xen.c             |   2 +-
 xen/arch/x86/smp.c                       |   2 +-
 xen/include/asm-x86/guest/hyperv-hcall.h |   5 +-
 xen/include/asm-x86/guest/hypervisor.h   |  10 +-
 10 files changed, 329 insertions(+), 13 deletions(-)
 create mode 100644 xen/arch/x86/guest/hyperv/tlb.c
 create mode 100644 xen/arch/x86/guest/hyperv/util.c