linux-kernel - [146/151] intel-iommu: Check for an RMRR which ends before it starts.

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Message-Id: <20091217035701.923132279@mini.kroah.org>
Date:	Wed, 16 Dec 2009 19:57:23 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	David Woodhouse <David.Woodhouse@...el.com>
Subject: [146/151] intel-iommu: Check for an RMRR which ends before it starts.

2.6.32-stable review patch.  If anyone has any objections, please let us know.

------------------

From: David Woodhouse <David.Woodhouse@...el.com>

commit 5595b528b49a702c0428c0762bab60999648254c upstream.

Some HP BIOSes report an RMRR region (a region which needs a 1:1 mapping
in the IOMMU for a given device) which has an end address lower than its
start address. Detect that and warn, rather than triggering the
BUG() in dma_pte_clear_range().

Signed-off-by: David Woodhouse <David.Woodhouse@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/pci/intel-iommu.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

--- a/drivers/pci/intel-iommu.c
+++ b/drivers/pci/intel-iommu.c
@@ -1991,6 +1991,16 @@ static int iommu_prepare_identity_map(st
 	       "IOMMU: Setting identity map for device %s [0x%Lx - 0x%Lx]\n",
 	       pci_name(pdev), start, end);
 	
+	if (end < start) {
+		WARN(1, "Your BIOS is broken; RMRR ends before it starts!\n"
+			"BIOS vendor: %s; Ver: %s; Product Version: %s\n",
+			dmi_get_system_info(DMI_BIOS_VENDOR),
+			dmi_get_system_info(DMI_BIOS_VERSION),
+		     dmi_get_system_info(DMI_PRODUCT_VERSION));
+		ret = -EIO;
+		goto error;
+	}
+
 	if (end >> agaw_to_width(domain->agaw)) {
 		WARN(1, "Your BIOS is broken; RMRR exceeds permitted address width (%d bits)\n"
 		     "BIOS vendor: %s; Ver: %s; Product Version: %s\n",


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