KVM wants to emulate the DIV and IDIV instructions by executing them natively;
this can cause a #DE to be raised.
Allow the exception handling mechanism to process #DE exceptions so KVM can
catch and process them.
Signed-off-by: Avi Kivity <avi@xxxxxxxxxx>
---
arch/x86/kernel/traps.c | 10 +++++++++-
1 files changed, 9 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/traps.c b/arch/x86/kernel/traps.c
index 725ef4d..dd313cf 100644
--- a/arch/x86/kernel/traps.c
+++ b/arch/x86/kernel/traps.c
@@ -205,7 +205,8 @@ dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \
do_trap(trapnr, signr, str, regs, error_code, &info); \
}
-DO_ERROR_INFO(0, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip)
+static DO_ERROR_INFO(0, SIGFPE, "divide error", divide_error_user,
+ FPE_INTDIV, regs->ip)
DO_ERROR(4, SIGSEGV, "overflow", overflow)
DO_ERROR(5, SIGSEGV, "bounds", bounds)
DO_ERROR_INFO(6, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip)
@@ -217,6 +218,13 @@ DO_ERROR(12, SIGBUS, "stack segment", stack_segment)
#endif
DO_ERROR_INFO(17, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0)
+dotraplinkage void do_divide_error(struct pt_regs *regs, long error_code)
+{
+ if (!user_mode_vm(regs) && fixup_exception(regs))
+ return;
+ do_divide_error_user(regs, error_code);
+}
+
#ifdef CONFIG_X86_64
/* Runs on IST stack */
dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code)
--
1.7.1
--
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