KVM: ia64: enable external interrupt in vmm

Currently, the interrupt enable bit is cleared when in
the vmm.  This patch sets the bit and the external interrupts can
be dealt with when in the vmm.  This improves the I/O performance.

Signed-off-by: Yang Zhang <yang.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/arch/ia64/kvm/process.c b/arch/ia64/kvm/process.c
index b1dc80952d91..a8f84da04b49 100644
--- a/arch/ia64/kvm/process.c
+++ b/arch/ia64/kvm/process.c
@@ -652,20 +652,25 @@ void  kvm_ia64_handle_break(unsigned long ifa, struct kvm_pt_regs *regs,
                 unsigned long isr, unsigned long iim)
 {
         struct kvm_vcpu *v = current_vcpu;
+        long psr;
 
         if (ia64_psr(regs)->cpl == 0) {
                 /* Allow hypercalls only when cpl = 0.  */
                 if (iim == DOMN_PAL_REQUEST) {
+                        local_irq_save(psr);
                         set_pal_call_data(v);
                         vmm_transition(v);
                         get_pal_call_result(v);
                         vcpu_increment_iip(v);
+                        local_irq_restore(psr);
                         return;
                 } else if (iim == DOMN_SAL_REQUEST) {
+                        local_irq_save(psr);
                         set_sal_call_data(v);
                         vmm_transition(v);
                         get_sal_call_result(v);
                         vcpu_increment_iip(v);
+                        local_irq_restore(psr);
                         return;
                 }
         }