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

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Message-ID: <e0dcfeee-f35b-6c61-51b7-73fcdbf57760@redhat.com>
Date:   Mon, 26 Nov 2018 17:45:20 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>, kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, Roman Kagan <rkagan@...tuozzo.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>, x86@...nel.org,
        "Michael Kelley (EOSG)" <Michael.H.Kelley@...rosoft.com>
Subject: Re: [PATCH v2 0/4] x86/kvm/hyper-v: Implement Direct Mode for
 synthetic timers

On 26/11/18 16:47, Vitaly Kuznetsov wrote:
> 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(-)
> 

Queued, thanks.

Paolo