linux-kernel - RE: [PATCH 1/1] hv: Use only one receive buffer and kmalloc on initialize

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Message-ID: <8AFC7968D54FB448A30D8F38F259C5622C0BC809@TK5EX14MBXC116.redmond.corp.microsoft.com>
Date:	Mon, 13 Dec 2010 20:06:20 +0000
From:	Hank Janssen <hjanssen@...rosoft.com>
To:	Greg KH <greg@...ah.com>
CC:	"gregkh@...e.de" <gregkh@...e.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>
Subject: RE: [PATCH 1/1] hv: Use only one receive buffer and kmalloc on
 initialize



> -----Original Message-----
> From: Greg KH [mailto:greg@...ah.com]
> Sent: Monday, December 13, 2010 11:41 AM
> > The current versions of Hyper-V support interrupt handling on CPU0 only.
> > I can make multiple buffers per channel, but because of Hyper-V
> > implementation It does not really make a difference.
> 
> Then put a big fat note in there saying this, and that it will have to change if
> the hyperv channel ever changes.
> 
> Hm, how will you handle things if the hyperv core changes and an old kernel
> is running this code where things were "assumed" about the reentrancy
> happening here?

I will re-roll this patch to have a buffer per channel. It is a more elegant design
Even though Hyper-V behavior is not changing in Win8 for this.

Hank.

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