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[Xen-ia64-devel] [PATCH] xen might misunderstand a normal page as I/O pa
| To: | xen-ia64-devel@xxxxxxxxxxxxxxxxxxx |
|---|---|
| Subject: | [Xen-ia64-devel] [PATCH] xen might misunderstand a normal page as I/O page |
| From: | Kouya SHIMURA <kouya@xxxxxxxxxxxxxx> |
| Date: | Wed, 24 Jan 2007 13:31:20 +0900 |
| Delivery-date: | Tue, 23 Jan 2007 20:31:34 -0800 |
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| Sender: | xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx |
Hi, Hypervisor might misunderstand a normal page as I/O page if a guest OS uses the ig field in the guest VHPT. It seems to be harmless but slightly slow down. Thanks, Kouya Signed-off-by: Kouya Shimura <kouya@xxxxxxxxxxxxxx> diff -r 58637a0a7c7e xen/arch/ia64/vmx/vtlb.c
--- a/xen/arch/ia64/vmx/vtlb.c Wed Jan 17 21:45:34 2007 -0700
+++ b/xen/arch/ia64/vmx/vtlb.c Wed Jan 24 12:35:55 2007 +0900
@@ -248,6 +248,7 @@ u64 guest_vhpt_lookup(u64 iha, u64 *pte)
"tnat.nz p6,p7=r9;;"
"(p6) mov %0=1;"
"(p6) mov r9=r0;"
+ "(p7) extr.u r9=r9,0,53;;"
"(p7) mov %0=r0;"
"(p7) st8 [%2]=r9;;"
"ssm psr.ic;;"
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