linux-kernel - Re: [PATCH 0/7] hv: CPU onlining/offlining fixes and improvements

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Message-ID: <87eg0lw8bm.fsf@vitty.brq.redhat.com>
Date:   Mon, 02 Jan 2017 20:49:49 +0100
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     "K. Y. Srinivasan" <kys@...rosoft.com>
Cc:     linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Stephen Hemminger <stephen@...workplumber.org>
Subject: Re: [PATCH 0/7] hv: CPU onlining/offlining fixes and improvements

Vitaly Kuznetsov <vkuznets@...hat.com> writes:

> Some time ago we forbade CPU offlining for Hyper-V and this was sufficient
> if you boot with all CPUs onlined. Turns out, people may want to limit the
> number online CPUs by passing 'maxcpus=' kernel parameter and we hit a
> crash in Hyper-V code in this case. After some thinking, I think we may not
> only fix the crash but also make the offlining prevention fine-grained: we
> need to prevent from offlining CPUs which have VMBus channels attached
> only. All offlined CPUs may always be onlined.
>
> PATCH1 fixes a bug which is not directly related to the series, I hit it
> while testing hv_vmbus module unload with this series.
>
> Vitaly Kuznetsov (7):
>   hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels()
>   hv: allocate synic pages for all present CPUs
>   hv: init percpu_list in hv_synic_alloc()
>   hv: change clockevents unbind tactics
>   hv: check all present cpus in vmbus_wait_for_unload()
>   hv: switch to cpuhp state machine for synic init/cleanup
>   hv: make CPU offlining prevention fine-grained

K. Y., 

it seems that for some reason only patches 1 and 4 from this series made
it upstream (and to char-misc tree). Could you please resend the rest to
Greg? Please let me know if you want me to rebase/retest. Thanks!

-- 
  Vitaly