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

From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org
Cc: "Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	linux-kernel@vger.kernel.org,
	"Roman Kagan" <rkagan@virtuozzo.com>,
	"K. Y. Srinivasan" <kys@microsoft.com>,
	"Haiyang Zhang" <haiyangz@microsoft.com>,
	"Stephen Hemminger" <sthemmin@microsoft.com>,
	x86@kernel.org,
	"Michael Kelley (EOSG)" <Michael.H.Kelley@microsoft.com>
Subject: [PATCH v2 0/4] x86/kvm/hyper-v: Implement Direct Mode for synthetic timers
Date: Mon, 26 Nov 2018 16:47:28 +0100	[thread overview]
Message-ID: <20181126154732.23025-1-vkuznets@redhat.com> (raw)

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(-)

-- 
2.19.1