Without this delay, Xen could not bring APs up while working with TXT/tboot, because tboot need some time in APs to handle INIT before becoming ready for receiving SIPIs. (this delay was removed as part of c/s 23724 by Tim Deegan)
Signed-off-by: Gang Wei <gang....@intel.com>
diff -r d1aefee43af1 xen/arch/x86/smpboot.c
--- a/xen/arch/x86/smpboot.c Wed Dec 21 18:51:31 2011 +0800
+++ b/xen/arch/x86/smpboot.c Wed Dec 21 19:08:57 2011 +0800
@@ -463,6 +463,10 @@ static int wakeup_secondary_cpu(int phys
send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
} while ( send_status && (timeout++ < 1000) );
}
+ else
+ {
+ mdelay(10);
+ }
/*
* Should we send STARTUP IPIs ?
delay-btw-init-and-sipi.patch
Description: delay-btw-init-and-sipi.patch
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