Per Hyper-V specification (and as required by Hyper-V-aware guests), SynIC provides 4 per-vCPU timers. Each timer is programmed via a pair of MSRs, and signals expiration by delivering a special format message to the configured SynIC message slot and triggering the corresponding synthetic interrupt.
Note: as implemented by this patch, all periodic timers are "lazy" (i.e. if the vCPU wasn't scheduled for more than the timer period the timer events are lost), regardless of the corresponding configuration MSR. If deemed necessary, the "catch up" mode (the timer period is shortened until the timer catches up) will be implemented later. The Hyper-V SynIC timers support is required to load winhv.sys inside Windows guest on which guest VMBus devices depends on. This patches depends on Hyper-V SynIC patches previosly sent. Signed-off-by: Andrey Smetanin <asmeta...@virtuozzo.com> CC: Gleb Natapov <g...@kernel.org> CC: Paolo Bonzini <pbonz...@redhat.com> CC: "K. Y. Srinivasan" <k...@microsoft.com> CC: Haiyang Zhang <haiya...@microsoft.com> CC: Vitaly Kuznetsov <vkuzn...@redhat.com> CC: Roman Kagan <rka...@virtuozzo.com> CC: Denis V. Lunev <d...@openvz.org> CC: qemu-de...@nongnu.org Andrey Smetanin (7): drivers/hv: Move HV_SYNIC_STIMER_COUNT into Hyper-V UAPI x86 header drivers/hv: Move struct hv_message into UAPI Hyper-V x86 header kvm/x86: Rearrange func's declarations inside Hyper-V header kvm/x86: Added Hyper-V vcpu_to_hv_vcpu()/hv_vcpu_to_vcpu() helpers kvm/x86: Hyper-V internal helper to read MSR HV_X64_MSR_TIME_REF_COUNT kvm/x86: Hyper-V SynIC message slot pending clearing at SINT ack kvm/x86: Hyper-V SynIC timers arch/x86/include/asm/kvm_host.h | 13 ++ arch/x86/include/uapi/asm/hyperv.h | 99 ++++++++++ arch/x86/kvm/hyperv.c | 367 ++++++++++++++++++++++++++++++++++++- arch/x86/kvm/hyperv.h | 54 ++++-- arch/x86/kvm/x86.c | 9 + drivers/hv/hyperv_vmbus.h | 93 ---------- include/linux/kvm_host.h | 3 + 7 files changed, 527 insertions(+), 111 deletions(-) -- 2.4.3 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html