Xen doesn't call start_secondary.
Cc: [email protected]
Signed-off-by: Andy Lutomirski <[email protected]>
---
espfix still doesn't seem to work on Xen (it goes boom in some way that
I don't understand right now), but initializing all CPUs instead of just
one of them seems like a good start.
ISTM the right fix is probably to shove the espfix logic into
native_iret and to tweak the paravirt logic so that native_iret always
gets invoked. I suspect that Xen will need its own implementation of
espfix64 in the hypervisor and that, ultimately, someone may want to
stop initializing espfix64 at all on Xen guests.
arch/x86/xen/smp.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 7005974..eea9bcc 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -23,6 +23,7 @@
#include <asm/desc.h>
#include <asm/pgtable.h>
#include <asm/cpu.h>
+#include <asm/espfix.h>
#include <xen/interface/xen.h>
#include <xen/interface/vcpu.h>
@@ -85,6 +86,13 @@ static void cpu_bringup(void)
xen_setup_cpu_clockevents();
+ /*
+ * Enable the espfix hack for this CPU
+ */
+#ifdef CONFIG_X86_ESPFIX64
+ init_espfix_ap();
+#endif
+
notify_cpu_starting(cpu);
set_cpu_online(cpu, true);
--
1.9.3
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