[Xen-ia64-devel] [PATCH] xen might misunderstand a normal page as I/O page

[Kouya SHIMURA <kouya@xxxxxxxxxxxxxx>]

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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