From: pbrook <pbrook>
Date: Sun, 12 Nov 2006 20:55:05 +0000 (+0000)
Subject: Avoid redundant TLB flushes (Daniel Jacobowitz).
X-Git-Tag: release_0_9_1~1684
X-Git-Url: http://xenbits.xensource.com/gitweb?a=commitdiff_plain;h=e45eeab0990c8c05d8a3371e9218fc40c1bd8ff0;p=qemu-xen-4.6-testing.git

Avoid redundant TLB flushes (Daniel Jacobowitz).
---

diff --git a/target-mips/op_helper.c b/target-mips/op_helper.c
index bf397c9b4..6e31436f5 100644
--- a/target-mips/op_helper.c
+++ b/target-mips/op_helper.c
@@ -572,8 +572,17 @@ static void invalidate_tlb (int idx)
 {
     tlb_t *tlb;
     target_ulong addr;
+    uint8_t ASID;
+
+    ASID = env->CP0_EntryHi & 0xFF;
 
     tlb = &env->tlb[idx];
+    /* The qemu TLB is flushed then the ASID changes, so no need to
+       flush these entries again.  */
+    if (tlb->G == 0 && tlb->ASID != ASID) {
+        return;
+    }
+
     if (tlb->V0) {
         tb_invalidate_page_range(tlb->PFN[0], tlb->end - tlb->VPN);
         addr = tlb->VPN;