From: Malcolm Crossley <malcolm.cross...@citrix.com>
For Intel IGD passthrough, the guest driver programs the device to DMA
to/from its RMRR.
c/s 619ecf8 "make {set,clear}_identity_p2m_mapping() work for PV guests"
was incomplete for pre-Broadwell systems which did not support shared
EPT.
The correct check to use is iommu_use_hap_pt() not
paging_mode_translate() as IOMMU mappings also need to be created for
HVM guests with separate EPT and IOMMU tables.
Signed-off-by: Malcolm Crossley <malcolm.cross...@citrix.com>
Signed-off-by: Andrew Cooper <andrew.coop...@citrix.com>
CC: Jan Beulich <jbeul...@suse.com>
CC: George Dunlap <george.dun...@eu.citrix.com>
CC: Wei Liu <wei.l...@citrix.com>
---
xen/arch/x86/mm/p2m.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index c4329d2..c7f437c 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -957,7 +957,7 @@ int set_identity_p2m_entry(struct domain *d, unsigned long
gfn,
struct p2m_domain *p2m = p2m_get_hostp2m(d);
int ret;
- if ( !paging_mode_translate(p2m->domain) )
+ if ( !iommu_use_hap_pt(d) )
{
if ( !need_iommu(d) )
return 0;
@@ -1032,7 +1032,7 @@ int clear_identity_p2m_entry(struct domain *d, unsigned
long gfn)
struct p2m_domain *p2m = p2m_get_hostp2m(d);
int ret;
- if ( !paging_mode_translate(d) )
+ if ( !iommu_use_hap_pt(d) )
{
if ( !need_iommu(d) )
return 0;
--
1.7.10.4
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