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.
The series was tested with Hyper-V on KVM as well as kvm-unit-tests.
I'm including Qemu a kvm-unit-tests patches for testing purposes.
Vitaly Kuznetsov (3):
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
arch/x86/include/asm/hyperv-tlfs.h | 73 +++++++++++++++++++--
arch/x86/include/asm/kvm_host.h | 2 +-
arch/x86/kvm/hyperv.c | 100 ++++++++++++++++++++++-------
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, 155 insertions(+), 102 deletions(-)
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2.17.2
