linux-kernel - Re: [PANIC, hyperv] BUG: unable to handle kernel paging request at ffff880077800004 (hv_ringbuffer

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Message-ID: <20140829102411.GE5071@mwanda>
Date:	Fri, 29 Aug 2014 13:24:11 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Dexuan Cui <decui@...rosoft.com>
Cc:	KY Srinivasan <kys@...rosoft.com>,
	Sitsofe Wheeler <sitsofe@...il.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>
Subject: Re: [PANIC, hyperv] BUG: unable to handle kernel paging request at
 ffff880077800004 (hv_ringbuffer_write)

On Fri, Aug 29, 2014 at 10:16:32AM +0000, Dexuan Cui wrote:
> Hi Dan,
> 
> Section 4.11.3 of Hypervisor Top Level Functional Specification(available at
> http://blogs.msdn.com/b/virtual_pc_guy/archive/2014/02/17/updated-hypervisor-top-level-functional-specification.aspx)
> says HV_STATUS_INVALID_ALIGNMENT can also be returned for a hypercall if
> "the specified input or output parameter lists spans pages."
> 
> My understanding is: the input's memory range shouldn't cross a page
> boundary.

Ah.  That makes sense then.  Thanks.

regards,
dan carpenter

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