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Re: [Xen-devel] [PATCH v2] xen/pv: Fix a boot up hang revealed by int3 self test



On 2019/7/12 21:09, Peter Zijlstra wrote:
On Fri, Jul 12, 2019 at 09:04:22PM +0800, Zhenzhong Duan wrote:
On 2019/7/12 20:06, Peter Zijlstra wrote:
On Thu, Jul 11, 2019 at 04:15:21PM +0800, Zhenzhong Duan wrote:
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 4722ba2..2138d69 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -596,7 +596,7 @@ struct trap_array_entry {
   static struct trap_array_entry trap_array[] = {
        { debug,                       xen_xendebug,                    true },
-       { int3,                        xen_xenint3,                     true },
+       { int3,                        xen_int3,                        true },
        { double_fault,                xen_double_fault,                true },
   #ifdef CONFIG_X86_MCE
        { machine_check,               xen_machine_check,               true },
I'm confused on the purpose of trap_array[], could you elucidate me?
Used to replace trap handler addresses by Xen specific ones and sanity check

if there's an unexpected IST-using fault handler.
git grep xen_int3, failed me. Where does that symbol come from?

Generated by "xen_pv_trap int3" in arch/x86/xen/xen-asm_64.S

Zhenzhong


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