Just in case we still don't get CR0.TS handling right, prevent a host
crash by honoring exception fixups in do_device_not_available(). This
would in particular cover emulator stubs raising #NM.
Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
v2: Add ASSERT_UNREACHABLE().
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -1749,7 +1749,21 @@ void do_device_not_available(struct cpu_
{
struct vcpu *curr = current;
- BUG_ON(!guest_mode(regs));
+ if ( !guest_mode(regs) )
+ {
+ unsigned long fixup = search_exception_table(regs);
+
+ dprintk(XENLOG_ERR, "#NM: %p [%ps] -> %p\n",
+ _p(regs->rip), _p(regs->rip), _p(fixup));
+ /*
+ * We mustn't come here, but for release builds have the recovery
+ * logic in place nevertheless.
+ */
+ ASSERT_UNREACHABLE();
+ BUG_ON(!fixup);
+ regs->rip = fixup;
+ return;
+ }
vcpu_restore_fpu_lazy(curr);
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