[PATCH v2 0/4] x86/kvm/hyper-v: Implement Direct Mode for synthetic timers

From: Vitaly Kuznetsov
Date: Mon Nov 26 2018 - 10:47:43 EST


Changes since v1:
- avoid open-coding stimer_mark_pending() in kvm_hv_notify_acked_sint() and
kvm_hv_synic_send_eoi [Paolo Bonzini]

Turns out Hyper-V on KVM (as of 2016) will only use synthetic timers
if direct mode is available. With direct mode we notify the guest by
asserting APIC irq instead of sending a SynIC message.

Qemu and kvm-unit-test patches for testing this series can be found in
v1 submission:
https://lkml.org/lkml/2018/11/13/972

Vitaly Kuznetsov (4):
x86/hyper-v: move synic/stimer control structures definitions to
hyperv-tlfs.h
x86/kvm/hyper-v: use stimer config definition from hyperv-tlfs.h
x86/kvm/hyper-v: direct mode for synthetic timers
x86/kvm/hyper-v: avoid open-coding stimer_mark_pending() in
kvm_hv_notify_acked_sint()

arch/x86/include/asm/hyperv-tlfs.h | 73 ++++++++++++++++++--
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/hyperv.c | 106 +++++++++++++++++++++--------
arch/x86/kvm/trace.h | 10 +--
arch/x86/kvm/x86.c | 1 +
drivers/hv/hv.c | 2 +-
drivers/hv/hyperv_vmbus.h | 68 ------------------
include/uapi/linux/kvm.h | 1 +
8 files changed, 154 insertions(+), 109 deletions(-)

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2.19.1