[Xen-devel] [PATCH] x86/mtrr: recalculate P2M type for domains with iocaps

[Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>]

This change reflects the logic in epte_get_entry_emt() and allows
changes in guest MTTRs to be reflected in EPT for domains having
direct access to certain hardware memory regions but without IOMMU
context assigned (e.g. XenGT).

Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>
---
 xen/arch/x86/hvm/mtrr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index b8fa340..7ccd85b 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -783,7 +783,7 @@ HVM_REGISTER_SAVE_RESTORE(MTRR, hvm_save_mtrr_msr, 
hvm_load_mtrr_msr, 1,
 
 void memory_type_changed(struct domain *d)
 {
-    if ( has_iommu_pt(d) && d->vcpu && d->vcpu[0] )
+    if ( (has_iommu_pt(d) || cache_flush_permitted(d)) && d->vcpu && 
d->vcpu[0] )
     {
         p2m_memory_type_changed(d);
         flush_all(FLUSH_CACHE);
-- 
2.7.4


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