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Date:   Thu, 14 Jan 2021 19:32:32 -0500
To:     Josh Poimboeuf <>,
        Peter Zijlstra <>,
        Sami Tolvanen <>,
        Sedat Dilek <>,
        Kees Cook <>,
        Nick Desaulniers <>,,
        Miroslav Benes <>,
        Juergen Gross <>
Subject: Re: [PATCH 14/21] x86/xen: Support objtool vmlinux.o validation in

On 1/14/21 2:40 PM, Josh Poimboeuf wrote:
> The Xen hypercall page is filled with zeros, causing objtool to fall
> through all the empty hypercall functions until it reaches a real
> function, resulting in a stack state mismatch.
> The build-time contents of the hypercall page don't matter, since it
> gets mapped to the hypervisor.  Make it more palatable to objtool by
> making each hypervisor function a true empty function, with nops and a
> return.
> Cc: Boris Ostrovsky <>
> Cc: Juergen Gross <>
> Signed-off-by: Josh Poimboeuf <>

Reviewed-by: Boris Ostrovsky <>

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