From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Date: Wed, 23 May 2012 16:56:59 +0000 (-0400)
Subject: xen/hvc: Check HVM_PARAM_CONSOLE_[EVTCHN|PFN] for correctness.
X-Git-Tag: v3.5-rc3~10^2~5
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5842f5768599094758931b74190cdf93641a8e35;p=pandora-kernel.git

xen/hvc: Check HVM_PARAM_CONSOLE_[EVTCHN|PFN] for correctness.

We need to make sure that those parameters are setup to be correct.
As such the value of 0 is deemed invalid and we find that we
bail out. The hypervisor sets by default all of them to be zero
and when the hypercall is done does a simple:

 a.value = d->arch.hvm_domain.params[a.index];

Which means that if the Xen toolstack forgot to setup the proper
HVM_PARAM_CONSOLE_EVTCHN (or the PFN one), we would get the
default value of 0 and use that.

CC: stable@kernel.org
Fixes-Oracle-Bug: 14091238
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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