Re: [PATCH v6 1/2] x86/sev: Make sure IRQs are disabled while GHCB is active

From: Peter Zijlstra
Date: Fri Jun 18 2021 - 06:55:15 EST


On Fri, Jun 18, 2021 at 10:17:54AM +0200, Joerg Roedel wrote:
> On Thu, Jun 17, 2021 at 05:38:46PM +0200, Peter Zijlstra wrote:
> > I'm getting (with all of v6.1 applied):
> >
> > vmlinux.o: warning: objtool: __sev_es_nmi_complete()+0x1bf: call to panic() leaves .noinstr.text section
> >
> > $ ./scripts/faddr2line defconfig-build/vmlinux __sev_es_nmi_complete+0x1bf
> > __sev_es_nmi_complete+0x1bf/0x1d0:
> > __sev_get_ghcb at arch/x86/kernel/sev.c:223
> > (inlined by) __sev_es_nmi_complete at arch/x86/kernel/sev.c:519
>
> I see where this is coming from, but can't create the same warning. I
> did run 'objtool check -n vmlinux'. Is there more to do to get the full
> check?

You get those when you enable CONFIG_DEBUG_ENTRY=y (make sure to have
PARAVIRT=n, I so need to go fix that :/).