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From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 14 Jun 2022 23:16:01 +0200
Subject: x86/xen: Add UNTRAIN_RET
Origin: https://git.kernel.org/linus/d147553b64bad34d2f92cb7d8ba454ae95c3baac
Ensure the Xen entry also passes through UNTRAIN_RET.
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
---
arch/x86/entry/entry_64.S | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index f4384a29086f..0c88802e1155 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -328,6 +328,12 @@ SYM_CODE_END(ret_from_fork)
#endif
.endm
+SYM_CODE_START_LOCAL(xen_error_entry)
+ UNWIND_HINT_FUNC
+ UNTRAIN_RET
+ RET
+SYM_CODE_END(xen_error_entry)
+
/**
* idtentry_body - Macro to emit code calling the C function
* @cfunc: C function to be called
@@ -347,7 +353,7 @@ SYM_CODE_END(ret_from_fork)
* switch the CR3. So it can skip invoking error_entry().
*/
ALTERNATIVE "call error_entry; movq %rax, %rsp", \
- "", X86_FEATURE_XENPV
+ "call xen_error_entry", X86_FEATURE_XENPV
ENCODE_FRAME_POINTER
UNWIND_HINT_REGS
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