From: Olaf Hering <olaf@aepfle.de>
To: Vitaly Kuznetsov <vkuznets@redhat.com>
Cc: kys@microsoft.com, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, devel@linuxdriverproject.org
Subject: Re: move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel
Date: Thu, 15 Dec 2016 14:51:12 +0100 [thread overview]
Message-ID: <20161215135111.GD6336@aepfle.de> (raw)
In-Reply-To: <87bmwd490b.fsf@vitty.brq.redhat.com>
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On Thu, Dec 15, Vitaly Kuznetsov wrote:
> vmbus_wait_for_unload() may be receiving a message (not necessarily the
> CHANNELMSG_UNLOAD_RESPONSE, we may see some other message) on the same
> CPU it runs and in this case wrmsrl() makes sense. In other cases it
> does nothing (neither good nor bad).
If that other cpu has interrupts disabled it may not process a pending
msg (the response may be stuck in the host queue?), and the loop can not
kick the other cpus queue if a wrmsrl is just valid for the current cpu.
If thats true, the response will not arrive in the loop.
Olaf
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next prev parent reply other threads:[~2016-12-15 13:51 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-07 8:51 move hyperv CHANNELMSG_UNLOAD from crashed kernel to kdump kernel Olaf Hering
2016-12-07 15:04 ` KY Srinivasan
2016-12-07 15:46 ` Olaf Hering
2016-12-07 16:10 ` KY Srinivasan
2016-12-07 16:19 ` Olaf Hering
2016-12-07 16:24 ` KY Srinivasan
2016-12-07 16:39 ` Olaf Hering
2016-12-07 18:11 ` KY Srinivasan
2016-12-15 10:26 ` Vitaly Kuznetsov
2016-12-15 10:34 ` Olaf Hering
2016-12-15 10:36 ` Olaf Hering
2016-12-15 10:54 ` Vitaly Kuznetsov
2016-12-15 10:54 ` Vitaly Kuznetsov
2016-12-15 12:51 ` Olaf Hering
2016-12-15 13:28 ` Vitaly Kuznetsov
2016-12-15 13:51 ` Olaf Hering [this message]
2016-12-15 14:32 ` Vitaly Kuznetsov
2016-12-16 0:51 ` KY Srinivasan
2016-12-15 15:16 ` Olaf Hering
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