[Xen-devel] [PATCH v2 04/30] xen/x86: allow calling {sh/hap}_set_allocation with the idle domain

[Roger Pau Monne <roger.pau@xxxxxxxxxx>]

... and using the "preempted" parameter. The solution relies on just calling
softirq_pending if the current domain is the idle domain.

Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
---
Cc: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/arch/x86/mm/hap/hap.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/xen/arch/x86/mm/hap/hap.c b/xen/arch/x86/mm/hap/hap.c
index b6d2c61..2dc82f5 100644
--- a/xen/arch/x86/mm/hap/hap.c
+++ b/xen/arch/x86/mm/hap/hap.c
@@ -379,7 +379,9 @@ hap_set_allocation(struct domain *d, unsigned long pages, 
int *preempted)
             break;
 
         /* Check to see if we need to yield and try again */
-        if ( preempted && hypercall_preempt_check() )
+        if ( preempted &&
+             (is_idle_vcpu(current) ? softirq_pending(smp_processor_id()) :
+                                      hypercall_preempt_check()) )
         {
             *preempted = 1;
             return 0;
-- 
2.7.4 (Apple Git-66)


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