[Xen-changelog] [xen master] x86/HVM: limit flushing on cache attribute pinning adjustments

[patchbot@xxxxxxx]

commit efd5c610a2c33bd7ad36264a0fc5add9269a26dd
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Fri Mar 4 14:15:53 2016 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Fri Mar 4 14:15:53 2016 +0100

    x86/HVM: limit flushing on cache attribute pinning adjustments
    
    Avoid cache flush on EPT when removing a UC- range, since when used
    this type gets converted to UC anyway (there's no UC- among the types
    valid in MTRRs and hence EPT's emt field).
    
    We might further wwant to consider only forcing write buffer flushes
    when removing WC ranges.
    
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/hvm/mtrr.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index 80f868a..2761f9b 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -611,8 +611,21 @@ int32_t hvm_set_mem_pinned_cacheattr(
                 type = range->type;
                 call_rcu(&range->rcu, free_pinned_cacheattr_entry);
                 p2m_memory_type_changed(d);
-                if ( type != PAT_TYPE_UNCACHABLE )
+                switch ( type )
+                {
+                case PAT_TYPE_UC_MINUS:
+                    /*
+                     * For EPT we can also avoid the flush in this case;
+                     * see epte_get_entry_emt().
+                     */
+                    if ( hap_enabled(d) && cpu_has_vmx )
+                case PAT_TYPE_UNCACHABLE:
+                        break;
+                    /* fall through */
+                default:
                     flush_all(FLUSH_CACHE);
+                    break;
+                }
                 return 0;
             }
         rcu_read_unlock(&pinned_cacheattr_rcu_lock);
--
generated by git-patchbot for /home/xen/git/xen.git#master

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