Re: [PATCH 14/21] x86/xen: Support objtool vmlinux.o validation in xen-head.S

[boris . ostrovsky]

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 <boris.ostrovsky@xxxxxxxxxx>
> Cc: Juergen Gross <jgross@xxxxxxxx>
> Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>


Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>