2 files changed, 14 insertions, 0 deletions

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 33989d284ff0..843cb6646d82 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1533,6 +1533,9 @@ and is between 256 and 4096 characters. It is defined in the file
         noinitrd        [RAM] Tells the kernel not to load any configured
                         initial RAM disk.
 
+        nointremap      [X86-64, Intel-IOMMU] Do not enable interrupt
+                        remapping.
+
         nointroute      [IA-64]
 
         nojitter        [IA64] Disables jitter checking for ITC timers.
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index 5c2142656e96..842039e4955b 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -15,6 +15,14 @@ static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
 static int ir_ioapic_num;
 int intr_remapping_enabled;
 
+static int disable_intremap;
+static __init int setup_nointremap(char *str)
+{
+        disable_intremap = 1;
+        return 0;
+}
+early_param("nointremap", setup_nointremap);
+
 struct irq_2_iommu {
         struct intel_iommu *iommu;
         u16 irte_index;
@@ -506,6 +514,9 @@ int __init intr_remapping_supported(void)
 {
         struct dmar_drhd_unit *drhd;
 
+        if (disable_intremap)
+                return 0;
+
         for_each_drhd_unit(drhd) {
                 struct intel_iommu *iommu = drhd->iommu;