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x86/xen: Add ANNOTATE_NOENDBR to startup_xen() 

The startup_xen() kernel entry point is referenced by the ".note.Xen"
section, and is the real entry point of the VM. Control transfer is
through IRET, which *could* set NEED_ENDBR, however Xen currently does
no such thing.

Add ANNOTATE_NOENDBR to silence future objtool warnings.

Fixes: ed53a0d971 ("x86/alternative: Use .ibt_endbr_seal to seal indirect calls")
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Link: https://lkml.kernel.org/r/a87bd48b06d11ec4b98122a429e71e489b4e48c3.1650300597.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2022-04-18 09:50:25 -07:00 committed by Peter Zijlstra
parent 7a00829f8a
commit 1ab80a0da4
1 changed files with 1 additions and 0 deletions
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arch/x86/xen/xen-head.S
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@ -45,6 +45,7 @@ SYM_CODE_END(hypercall_page)
__INIT __INIT
SYM_CODE_START(startup_xen) SYM_CODE_START(startup_xen)
UNWIND_HINT_EMPTY UNWIND_HINT_EMPTY
ANNOTATE_NOENDBR
cld cld
/* Clear .bss */ /* Clear .bss */