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Subject[PATCH v2 00/10] Hyper-V: praravirtualized remote TLB flushing and hypercall improvements
Changes since v1:
- Add a patch to build code in arch/x86/hyperv/ only when CONFIG_HYPERV is
- Add a patch to get maximum virtual/logical processor on Hyper-V.
- Add additional clobbers to hypercalls [Jork Loeser]
- Add variable header size support to rep hypercalls.
- Rename vmbus_cpu_number_to_vp_number -> hv_cpu_number_to_vp_number
[K. Y. Srinivasan]
- Remove spinlocks from hyperv_flush_tlb_others() [Jork Loeser]
- Account for mm==NULL in hyperv_flush_tlb_others() [Simon Xiao]
to support >64 vCPUs [K. Y. Srinivasan, Jork Loeser]
- Move hyperv.h to arch-specific place [Steven Rostedt]
- Rebased to the latest char-misc-next tree.

Original descriptions:

Hyper-V supports hypercalls for doing local and remote TLB flushing and
gives its guests hints when using hypercall is preferred. While doing
hypercalls for local TLB flushes is probably not practical (and is not
being suggested by modern Hyper-V versions) remote TLB flush with a
hypercall brings significant improvement.

To test the series I wrote a special 'TLB trasher': on a 16 vCPU guest I
was creating 32 threads which were doing 100000 mmap/munmaps each on some
big file. Here are the results:

# time ./pthread_mmap ./randfile
real 3m44.994s
user 0m3.829s
sys 3m36.323s

# time ./pthread_mmap ./randfile
real 2m57.145s
user 0m3.797s
sys 2m34.812s

This series brings a number of small improvements along the way: fast
hypercall implementation and using it for event signaling, rep hypercalls
implementation, hyperv tracing subsystem (which only traces the newly added
remote TLB flush for now).

Vitaly Kuznetsov (10):
x86/hyper-v: include hyperv/ only when CONFIG_HYPERV is set
x86/hyper-v: stash the max number of virtual/logical processor
x86/hyper-v: make hv_do_hypercall() inline
x86/hyper-v: fast hypercall implementation
hyper-v: use fast hypercall for HVCALL_SIGNAL_EVENT
x86/hyper-v: implement rep hypercalls
hyper-v: globalize vp_index
x86/hyper-v: use hypercall for remote TLB flush
x86/hyper-v: support extended CPU ranges for TLB flush hypercalls
tracing/hyper-v: trace hyperv_mmu_flush_tlb_others()

arch/x86/Kbuild | 4 +-
arch/x86/hyperv/Makefile | 2 +-
arch/x86/hyperv/hv_init.c | 90 ++++++------
arch/x86/hyperv/mmu.c | 270 ++++++++++++++++++++++++++++++++++++
arch/x86/include/asm/mshyperv.h | 148 +++++++++++++++++++-
arch/x86/include/asm/trace/hyperv.h | 34 +++++
arch/x86/include/uapi/asm/hyperv.h | 36 +++++
arch/x86/kernel/cpu/mshyperv.c | 14 +-
drivers/hv/channel_mgmt.c | 22 ++-
drivers/hv/connection.c | 8 +-
drivers/hv/hv.c | 9 --
drivers/hv/hyperv_vmbus.h | 11 --
drivers/hv/vmbus_drv.c | 17 ---
drivers/pci/host/pci-hyperv.c | 4 +-
include/linux/hyperv.h | 21 ++-
16 files changed, 567 insertions(+), 124 deletions(-)
create mode 100644 arch/x86/hyperv/mmu.c
create mode 100644 arch/x86/include/asm/trace/hyperv.h


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