[Xen-devel] [PATCH] xen/arm64: Avoid sending SGI when kicking secondary cpus with spin_table

[Chen Baozi <cbz@xxxxxxxxxx>]

From: Chen Baozi <baozich@xxxxxxxxx>

On arm64, either firmware or xen's smp_up_cpu gate uses WFE on secondary
cpus to stand-by when booting. Thus, using SEV is enough for the boot
cpu to kick other secondaries. Further more, the current implementation
of cpu_up_send_sgi would pass a NULL cpumask pointer to send_SGI, which
then lead a data fault on GICv3 send_SGI implementation.

Signed-off-by: Chen Baozi <baozich@xxxxxxxxx>
---
 xen/arch/arm/arm64/smpboot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/arch/arm/arm64/smpboot.c b/xen/arch/arm/arm64/smpboot.c
index 341cc77..62e6abb 100644
--- a/xen/arch/arm/arm64/smpboot.c
+++ b/xen/arch/arm/arm64/smpboot.c
@@ -38,7 +38,7 @@ static int __init smp_spin_table_cpu_up(int cpu)
 
     sev();
 
-    return cpu_up_send_sgi(cpu);
+    return 0;
 }
 
 static void __init smp_spin_table_init(int cpu, struct dt_device_node *dn)
-- 
2.1.4


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