x86/vmx: Fix injection of #DB traps following XSA-156

x86/vmx: Fix injection of #DB traps following XSA-156

Most #DB exceptions are traps rather than faults, meaning that the instruction
pointer in the exception frame points after the instruction rather than at it.

However, VMX intercepts all have fault semantics, even when intercepting a
trap.  Re-injecting an intercepted trap as a fault causes an infinite loop in
the guest, by re-executing the same trapping instruction repeatedly.  This
breaks debugging inside the guest.

Introduce a helper which copies VM_EXIT_INTR_INTO to VM_ENTRY_INTR_INFO, and
use it to mirror the intercepted interrupt back to the guest.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Acked-by: Kevin Tian <kevin.tian@intel.com>