[IA64] set_metaphysical_mode fix

If the old mode is metaphysical mode and the new mode is
virtual mode. set_one_rr(0, PSCB(vcpu,rrs[0]) will not
set machine region register 0, because at this time,
PSCB(vcpu,metaphysical_mode) is 1, VMM need to update
metaphysical_mode first, then call set_one_rr.

Signed-off-by: Anthony Xu <anthony.xu@intel.com>

diff --git a/xen/arch/ia64/xen/vcpu.c b/xen/arch/ia64/xen/vcpu.c
index 561608873910efd42c01973dca2c6d5336220db5..8bf3bac9af0f3fe7445c3ab6bae9ba819bdacc68 100644 (file)
--- a/xen/arch/ia64/xen/vcpu.c
+++ b/xen/arch/ia64/xen/vcpu.c
@@ -172,10 +172,10 @@ void vcpu_set_metaphysical_mode(VCPU *vcpu, BOOLEAN newmode)
 {
        /* only do something if mode changes */
        if (!!newmode ^ !!PSCB(vcpu,metaphysical_mode)) {
+               PSCB(vcpu,metaphysical_mode) = newmode;
                if (newmode) set_metaphysical_rr0();
                else if (PSCB(vcpu,rrs[0]) != -1)
                        set_one_rr(0, PSCB(vcpu,rrs[0]));
-               PSCB(vcpu,metaphysical_mode) = newmode;
        }
 }