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Diffstat (limited to 'arch/x86/xen/enlighten_pv.c')
-rw-r--r--arch/x86/xen/enlighten_pv.c15
1 files changed, 14 insertions, 1 deletions
diff --git a/arch/x86/xen/enlighten_pv.c b/arch/x86/xen/enlighten_pv.c
index 4409306364dc..9a5a50cdaab5 100644
--- a/arch/x86/xen/enlighten_pv.c
+++ b/arch/x86/xen/enlighten_pv.c
@@ -583,6 +583,13 @@ DEFINE_IDTENTRY_RAW(xenpv_exc_debug)
exc_debug(regs);
}
+DEFINE_IDTENTRY_RAW(exc_xen_unknown_trap)
+{
+ /* This should never happen and there is no way to handle it. */
+ pr_err("Unknown trap in Xen PV mode.");
+ BUG();
+}
+
struct trap_array_entry {
void (*orig)(void);
void (*xen)(void);
@@ -631,6 +638,7 @@ static bool __ref get_trap_addr(void **addr, unsigned int ist)
{
unsigned int nr;
bool ist_okay = false;
+ bool found = false;
/*
* Replace trap handler addresses by Xen specific ones.
@@ -645,6 +653,7 @@ static bool __ref get_trap_addr(void **addr, unsigned int ist)
if (*addr == entry->orig) {
*addr = entry->xen;
ist_okay = entry->ist_okay;
+ found = true;
break;
}
}
@@ -655,9 +664,13 @@ static bool __ref get_trap_addr(void **addr, unsigned int ist)
nr = (*addr - (void *)early_idt_handler_array[0]) /
EARLY_IDT_HANDLER_SIZE;
*addr = (void *)xen_early_idt_handler_array[nr];
+ found = true;
}
- if (WARN_ON(ist != 0 && !ist_okay))
+ if (!found)
+ *addr = (void *)xen_asm_exc_xen_unknown_trap;
+
+ if (WARN_ON(found && ist != 0 && !ist_okay))
return false;
return true;