From: Chris Wright <chrisw@sous-sol.org>
To: Joseph Cihula <joseph.cihula@intel.com>
Cc: "dwmw2@infradead.org" <dwmw2@infradead.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
akpm@linux-foundation.org, "Wei, Gang" <gang.wei@intel.com>
Subject: Re: [PATCH RESEND 2] intel_iommu: disable all VT-d PMRs when TXT launched
Date: Thu, 21 Apr 2011 15:44:15 -0700 [thread overview]
Message-ID: <20110421224415.GG9569@sequoia.sous-sol.org> (raw)
In-Reply-To: <4DB0AB00.80105@intel.com>
* Joseph Cihula (joseph.cihula@intel.com) wrote:
> This patch detects when the kernel has been launched with TXT and then
> disables the PMRs on all VT-d engines. In some cases where the reason
> that remapping is not being enabled is due to possible ACPI DMAR table
> errors, the VT-d engine addresses may not be correct and thus not able
> to be safely programmed even to disable PMRs. Because part of the TXT
> launch process is the verification of these addresses, it will always be
> safe to disable PMRs if the TXT launch has succeeded and hence only
> doing this in such cases.
What about on resume? The ->ignored units won't get PMR disabled.
prev parent reply other threads:[~2011-04-21 22:45 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-21 18:04 [PATCH] " Joseph Cihula
2011-04-13 20:46 ` [PATCH RESEND] " Joseph Cihula
2011-04-21 22:09 ` [PATCH RESEND 2] " Joseph Cihula
2011-04-21 22:13 ` David Woodhouse
2011-04-21 22:44 ` Chris Wright [this message]
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