[PATCH 0/4] x86/hyper-v: optimize PV IPIs

Vitaly Kuznetsov
2018-06-22T17:06:32Z

When reviewing my "x86/hyper-v: use cheaper HVCALL_FLUSH_VIRTUAL_ADDRESS_
{LIST,SPACE} hypercalls when possible" patch Michael suggested to apply the
same idea to PV IPIs. Here we go!

Despite what Hyper-V TLFS says about HVCALL_SEND_IPI hypercall, it can
actually be 'fast' (passing parameters through registers). Use that too.

This series can collide with my "KVM: x86: hyperv: PV IPI support for
Windows guests" series as I rename ipi_arg_non_ex/ipi_arg_ex structures
there. Depending on which one gets in first we may need to do tiny
adjustments.

Vitaly Kuznetsov (4):
x86/hyper-v: implement hv_do_fast_hypercall16
x86/hyper-v: use 'fast' hypercall for HVCALL_SEND_IPI
x86/hyper-v: use cheaper HVCALL_SEND_IPI hypercall when possible
x86/hyper-v: trace PV IPI send

arch/x86/hyperv/hv_apic.c | 57 ++++++++++++++++++++-----------------
arch/x86/include/asm/mshyperv.h | 34 ++++++++++++++++++++++
arch/x86/include/asm/trace/hyperv.h | 15 ++++++++++
3 files changed, 80 insertions(+), 26 deletions(-)

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2.14.4