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| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-12-02 12:21:55 +0300 |
|---|---|---|
| committer | David Woodhouse <David.Woodhouse@intel.com> | 2009-12-08 13:02:52 +0300 |
| commit | 5595b528b49a702c0428c0762bab60999648254c (patch) | |
| tree | aa6c04a00e90eb7ac91e24aa295fc2022de4161d /drivers/pci/intel-iommu.c | |
| parent | 6ecbf01c7ce4c0f4c3bdfa0e64ac6258328fda6c (diff) | |
| download | linux-5595b528b49a702c0428c0762bab60999648254c.tar.xz | |
intel-iommu: Check for an RMRR which ends before it starts.
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().
Cc: stable@kernel.org
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/pci/intel-iommu.c')
| -rw-r--r-- | drivers/pci/intel-iommu.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pci/intel-iommu.c b/drivers/pci/intel-iommu.c index cb5cae3e0205..83cabdc118db 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -2000,6 +2000,16 @@ static int iommu_prepare_identity_map(struct pci_dev *pdev, "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", |