[Xen-devel] [tip:x86/asm] x86/traps: Enable all exception handler callbacks early

[tip-bot for Andy Lutomirski <tipbot@xxxxxxxxx>]

Commit-ID:  ae7ef45e12354a1e2f6013b46df0c9f5bbb6ffbe
Gitweb:     http://git.kernel.org/tip/ae7ef45e12354a1e2f6013b46df0c9f5bbb6ffbe
Author:     Andy Lutomirski <luto@xxxxxxxxxx>
AuthorDate: Sat, 2 Apr 2016 07:01:35 -0700
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Wed, 13 Apr 2016 11:37:45 +0200

x86/traps: Enable all exception handler callbacks early

Now that early_fixup_exception() has pt_regs, we can just call
fixup_exception() from it.  This will make fancy exception handlers
work early.

Tested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Signed-off-by: Andy Lutomirski <luto@xxxxxxxxxx>
Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: KVM list <kvm@xxxxxxxxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: xen-devel <Xen-devel@xxxxxxxxxxxxx>
Link: 
http://lkml.kernel.org/r/20fc047d926150cb08cb9b9f2923519b07ec1a15.1459605520.git.luto@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/mm/extable.c | 19 ++-----------------
 1 file changed, 2 insertions(+), 17 deletions(-)

diff --git a/arch/x86/mm/extable.c b/arch/x86/mm/extable.c
index da442f3..061a237 100644
--- a/arch/x86/mm/extable.c
+++ b/arch/x86/mm/extable.c
@@ -88,10 +88,6 @@ extern unsigned int early_recursion_flag;
 /* Restricted version used during very early boot */
 void __init early_fixup_exception(struct pt_regs *regs, int trapnr)
 {
-       const struct exception_table_entry *e;
-       unsigned long new_ip;
-       ex_handler_t handler;
-
        /* Ignore early NMIs. */
        if (trapnr == X86_TRAP_NMI)
                return;
@@ -102,19 +98,8 @@ void __init early_fixup_exception(struct pt_regs *regs, int 
trapnr)
        if (regs->cs != __KERNEL_CS)
                goto fail;
 
-       e = search_exception_tables(regs->ip);
-       if (!e)
-               goto fail;
-
-       new_ip  = ex_fixup_addr(e);
-       handler = ex_fixup_handler(e);
-
-       /* special handling not supported during early boot */
-       if (handler != ex_handler_default)
-               goto fail;
-
-       regs->ip = new_ip;
-       return;
+       if (fixup_exception(regs, trapnr))
+               return;
 
 fail:
        early_printk("PANIC: early exception 0x%02x IP %lx:%lx error %lx cr2 
0x%lx\n",

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