[Xen-changelog] [xen staging] xen/arm: Release maintenance interrupt when CPU is hot-unplugged

[patchbot@xxxxxxx]

commit fd0f38ddd1af32b04241e5b5539d867fcd7d458d
Author:     Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
AuthorDate: Fri Jun 1 15:17:47 2018 +0200
Commit:     Julien Grall <julien.grall@xxxxxxx>
CommitDate: Tue Jun 5 19:08:05 2018 +0100

    xen/arm: Release maintenance interrupt when CPU is hot-unplugged
    
    When a CPU is hot-unplugged the maintenance interrupt has to be
    released in order to free the memory that was allocated when the CPU
    was hotplugged and interrupt requested. The interrupt was requested
    using request_irq() which is called from start_secondary->
    init_maintenance_interrupt. With this patch the interrupt will be
    released when the CPU_DYING event is received by the callback which
    is added in gic.c.
    
    Signed-off-by: Mirela Simonovic <mirela.simonovic@xxxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/gic.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/xen/arch/arm/gic.c b/xen/arch/arm/gic.c
index 653a815127..5474030386 100644
--- a/xen/arch/arm/gic.c
+++ b/xen/arch/arm/gic.c
@@ -27,6 +27,8 @@
 #include <xen/list.h>
 #include <xen/device_tree.h>
 #include <xen/acpi.h>
+#include <xen/cpu.h>
+#include <xen/notifier.h>
 #include <asm/p2m.h>
 #include <asm/domain.h>
 #include <asm/platform.h>
@@ -462,6 +464,35 @@ int gic_iomem_deny_access(const struct domain *d)
     return gic_hw_ops->iomem_deny_access(d);
 }
 
+static int cpu_gic_callback(struct notifier_block *nfb,
+                            unsigned long action,
+                            void *hcpu)
+{
+    switch ( action )
+    {
+    case CPU_DYING:
+        /* This is reverting the work done in init_maintenance_interrupt */
+        release_irq(gic_hw_ops->info->maintenance_irq, NULL);
+        break;
+    default:
+        break;
+    }
+
+    return NOTIFY_DONE;
+}
+
+static struct notifier_block cpu_gic_nfb = {
+    .notifier_call = cpu_gic_callback,
+};
+
+static int __init cpu_gic_notifier_init(void)
+{
+    register_cpu_notifier(&cpu_gic_nfb);
+
+    return 0;
+}
+__initcall(cpu_gic_notifier_init);
+
 /*
  * Local variables:
  * mode: C
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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