[Xen-changelog] [xen-unstable] vt-d: Fix crash issue when not sharing EPT and VT-d tables.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir@xxxxxxx>
# Date 1294992517 0
# Node ID 47713825a3f910fc7cf7571947e8b3b4eab23d5f
# Parent  7bc5e072d98672529c0d37d91e79d55125c1d6df
vt-d: Fix crash issue when not sharing EPT and VT-d tables.

Signed-off-by: Allen Kay <allen.m.kay@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/iommu.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r 7bc5e072d986 -r 47713825a3f9 xen/drivers/passthrough/vtd/iommu.c
--- a/xen/drivers/passthrough/vtd/iommu.c       Fri Jan 14 08:02:26 2011 +0000
+++ b/xen/drivers/passthrough/vtd/iommu.c       Fri Jan 14 08:08:37 2011 +0000
@@ -1773,9 +1773,13 @@ void iommu_set_pgd(struct domain *d)
     ASSERT( is_hvm_domain(d) && d->arch.hvm_domain.hap_enabled );
 
     iommu_hap_pt_share = vtd_ept_share();
+    if ( !iommu_hap_pt_share )
+        goto out;
+
     pgd_mfn = pagetable_get_mfn(p2m_get_pagetable(p2m_get_hostp2m(d)));
     hd->pgd_maddr = pagetable_get_paddr(pagetable_from_mfn(pgd_mfn));
 
+out:
     dprintk(XENLOG_INFO VTDPREFIX,
             "VT-d page table %s with EPT table\n",
             iommu_hap_pt_share ? "shares" : "not sharing");

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