Namely Dom0 suffers from commit 5ae03990c1 ("xen/vtd: create RMRR
mapping") having removed the creation of such mappings for non-
translated guests.
Reported-by: Malcolm Crossley <[email protected]>
Signed-off-by: Jan Beulich <[email protected]>
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -957,7 +957,11 @@ int set_identity_p2m_entry(struct domain
int ret;
if ( !paging_mode_translate(p2m->domain) )
- return 0;
+ {
+ if ( !need_iommu(d) )
+ return 0;
+ return iommu_map_page(d, gfn, gfn, IOMMUF_readable|IOMMUF_writable);
+ }
gfn_lock(p2m, gfn, 0);
@@ -1028,7 +1032,11 @@ int clear_identity_p2m_entry(struct doma
int ret;
if ( !paging_mode_translate(d) )
- return 0;
+ {
+ if ( !need_iommu(d) )
+ return 0;
+ return iommu_unmap_page(d, gfn);
+ }
gfn_lock(p2m, gfn, 0);
x86/mm: make {set,clear}_identity_p2m_mapping() work for PV guests
Namely Dom0 suffers from commit 5ae03990c1 ("xen/vtd: create RMRR
mapping") having removed the creation of such mappings for non-
translated guests.
Reported-by: Malcolm Crossley <[email protected]>
Signed-off-by: Jan Beulich <[email protected]>
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -957,7 +957,11 @@ int set_identity_p2m_entry(struct domain
int ret;
if ( !paging_mode_translate(p2m->domain) )
- return 0;
+ {
+ if ( !need_iommu(d) )
+ return 0;
+ return iommu_map_page(d, gfn, gfn, IOMMUF_readable|IOMMUF_writable);
+ }
gfn_lock(p2m, gfn, 0);
@@ -1028,7 +1032,11 @@ int clear_identity_p2m_entry(struct doma
int ret;
if ( !paging_mode_translate(d) )
- return 0;
+ {
+ if ( !need_iommu(d) )
+ return 0;
+ return iommu_unmap_page(d, gfn);
+ }
gfn_lock(p2m, gfn, 0);
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