From: Keir Fraser <keir.fraser@citrix.com>
Date: Wed, 16 Jul 2008 10:15:14 +0000 (+0100)
Subject: vt-d: Disable VT-d table output on DMA page faults
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14188^2~10
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=d45e39c59085e0ca93317bff5551a0e8a4d7efbb;p=xen.git

vt-d: Disable VT-d table output on DMA page faults

Printing VT-d tables requires map_domain_page() which can not be
called from interrupt context (on x86_32).

Signed-off-by: Espen Skoglund <espen.skoglund@netronome.com>
---

diff --git a/xen/drivers/passthrough/vtd/iommu.c b/xen/drivers/passthrough/vtd/iommu.c
index 94b24f3845..8155121188 100644
--- a/xen/drivers/passthrough/vtd/iommu.c
+++ b/xen/drivers/passthrough/vtd/iommu.c
@@ -719,9 +719,11 @@ static int iommu_page_fault_do_one(struct iommu *iommu, int type,
             PCI_SLOT(source_id & 0xFF), PCI_FUNC(source_id & 0xFF), addr,
             fault_reason, iommu->reg);
 
+#ifndef __i386__ /* map_domain_page() cannot be used in this context */
     if ( fault_reason < 0x20 )
         print_vtd_entries(iommu, (source_id >> 8),
                           (source_id & 0xff), (addr >> PAGE_SHIFT));
+#endif
 
     return 0;
 }