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SubjectRe: [PATCH v2 28/39] x86/ibt,xen: Sprinkle the ENDBR
On Thu, Feb 24, 2022 at 03:52:06PM +0100, Peter Zijlstra wrote:
> +++ b/arch/x86/xen/xen-head.S
> @@ -25,8 +25,11 @@
> SYM_CODE_START(hypercall_page)
> .rept (PAGE_SIZE / 32)
> UNWIND_HINT_FUNC
> - .skip 31, 0x90
> - RET
> + ANNOTATE_NOENDBR
> + /*
> + * Xen will write the hypercall page, and sort out ENDBR.
> + */
> + .skip 32, 0xcc

I seem to remember this UNWIND_HINT_FUNC was only there to silence
warnings because of the ret. With the ret gone, maybe the hint can be
dropped as well.

--
Josh

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