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
--
2.20.1
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