On 7/11/19 10:17 PM, Mike Rapoport wrote:
On Thu, Jul 11, 2019 at 01:11:43PM -0700, Andi Kleen wrote:
Alexandre Chartre <alexandre.chartre@xxxxxxxxxx> writes:
jmp paranoid_exit
@@ -1182,6 +1196,16 @@ ENTRY(paranoid_entry)
xorl %ebx, %ebx
1:
+#ifdef CONFIG_ADDRESS_SPACE_ISOLATION
+ /*
+ * If address space isolation is active then abort it and return
+ * the original kernel CR3 in %r14.
+ */
+ ASI_START_ABORT_ELSE_JUMP 2f
+ movq %rdi, %r14
+ ret
+2:
+#endif
Unless I missed it you don't map the exception stacks into ASI, so it
has likely already triple faulted at this point.
The exception stacks are in the CPU entry area, aren't they?
That's my understanding, stacks come from tss in the CPU entry area and
the CPU entry area is part for the core ASI mappings (see patch 15/26).
alex.
