[Xen-changelog] [xen master] x86/EPT: flush cache when (potentially) limiting cachability

[patchbot@xxxxxxx]

commit 8cb7f7d135455f7374c96406e3d148a282e8cb31
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri May 2 10:54:07 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri May 2 10:54:07 2014 +0200

    x86/EPT: flush cache when (potentially) limiting cachability
    
    While generally such guest side changes ought to be followed by guest
    initiated flushes, we're flushing the cache under similar conditions
    elsewhere (e.g. when the guest sets CR0.CD), so let's do so here too.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Tim Deegan <tim@xxxxxxx>
---
 xen/arch/x86/hvm/mtrr.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index 0ec38fc..ee18553 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -650,8 +650,11 @@ int32_t hvm_set_mem_pinned_cacheattr(
             {
                 rcu_read_unlock(&pinned_cacheattr_rcu_lock);
                 list_del_rcu(&range->list);
+                type = range->type;
                 call_rcu(&range->rcu, free_pinned_cacheattr_entry);
                 p2m_memory_type_changed(d);
+                if ( type != PAT_TYPE_UNCACHABLE )
+                    flush_all(FLUSH_CACHE);
                 return 0;
             }
         rcu_read_unlock(&pinned_cacheattr_rcu_lock);
@@ -698,6 +701,8 @@ int32_t hvm_set_mem_pinned_cacheattr(
 
     list_add_rcu(&range->list, &d->arch.hvm_domain.pinned_cacheattr_ranges);
     p2m_memory_type_changed(d);
+    if ( type != PAT_TYPE_WRBACK )
+        flush_all(FLUSH_CACHE);
 
     return 0;
 }
@@ -787,7 +792,10 @@ HVM_REGISTER_SAVE_RESTORE(MTRR, hvm_save_mtrr_msr, 
hvm_load_mtrr_msr,
 void memory_type_changed(struct domain *d)
 {
     if ( iommu_enabled && d->vcpu && d->vcpu[0] )
+    {
         p2m_memory_type_changed(d);
+        flush_all(FLUSH_CACHE);
+    }
 }
 
 int epte_get_entry_emt(struct domain *d, unsigned long gfn, mfn_t mfn,
--
generated by git-patchbot for /home/xen/git/xen.git#master

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