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iommu/vt-d: Do not falsely log intel_iommu is unsupported kernel option 

Handling of intel_iommu kernel command line option should return "true" to
indicate option is valid and so avoid logging it as unknown by the core
parsing code.

Also log unknown sub-options at the notice level to let user know of
potential typos or similar.

Reported-by: Eero Tamminen <eero.t.tamminen@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://lore.kernel.org/r/20210831112947.310080-1-tvrtko.ursulin@linux.intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20211014053839.727419-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Tvrtko Ursulin 2021-10-14 13:38:31 +08:00 committed by Joerg Roedel
parent 9e1ff307c7
commit 5240aed2cd
1 changed files with 5 additions and 1 deletions
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6
drivers/iommu/intel/iommu.c
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@ -412,6 +412,7 @@ static int __init intel_iommu_setup(char *str)
{
if (!str)
return -EINVAL;
while (*str) {
if (!strncmp(str, "on", 2)) {
dmar_disabled = 0;
@ -441,13 +442,16 @@ static int __init intel_iommu_setup(char *str)
} else if (!strncmp(str, "tboot_noforce", 13)) {
pr_info("Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n");
intel_iommu_tboot_noforce = 1;
} else {
pr_notice("Unknown option - '%s'\n", str);
}
str += strcspn(str, ",");
while (*str == ',')
str++;
}
return 0;
return 1;
}
__setup("intel_iommu=", intel_iommu_setup);