diff options
| author | David Woodhouse <David.Woodhouse@intel.com> | 2009-12-02 09:21:55 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-18 14:05:55 -0800 |
| commit | 39035f9c09699eea2dd154d170919dcd41c6885d (patch) | |
| tree | 9db54b575b4c6ea0b532cf7d995dcc3f0d7c8386 | |
| parent | b02375be25be8895f1fdb63a0962fd465d88f998 (diff) | |
intel-iommu: Check for an RMRR which ends before it starts.
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@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -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 1840a0578a42..1db5b037edbc 100644 --- a/drivers/pci/intel-iommu.c +++ b/drivers/pci/intel-iommu.c @@ -1991,6 +1991,16 @@ 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", |