linux-kernel - RE: [PATCH 2/2] arm64: export __hyp_stub

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Date:   Fri, 15 Nov 2019 10:05:57 +0000
From:   Peng Fan <peng.fan@....com>
To:     Jan Kiszka <jan.kiszka@...mens.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "will@...nel.org" <will@...nel.org>
CC:     "allison@...utok.net" <allison@...utok.net>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "james.morse@....com" <james.morse@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "ralf.ramsauer@...-regensburg.de" <ralf.ramsauer@...-regensburg.de>,
        Alice Guo <alice.guo@....com>, dl-linux-imx <linux-imx@....com>
Subject: RE: [PATCH 2/2] arm64: export __hyp_stub_vectors

> Subject: Re: [PATCH 2/2] arm64: export __hyp_stub_vectors
> 
> On 15.11.19 10:45, Peng Fan wrote:
> > From: Peng Fan <peng.fan@....com>
> >
> > External hypervisors, like Jailhouse, need this address when they are
> > deactivated, in order to restore original state.
> >
> > Signed-off-by: Peng Fan <peng.fan@....com>
> > ---
> >   arch/arm64/include/asm/virt.h | 2 ++
> >   arch/arm64/kernel/hyp-stub.S  | 1 +
> >   2 files changed, 3 insertions(+)
> >
> > diff --git a/arch/arm64/include/asm/virt.h
> > b/arch/arm64/include/asm/virt.h index 0958ed6191aa..b1b48353e3b3
> > 100644
> > --- a/arch/arm64/include/asm/virt.h
> > +++ b/arch/arm64/include/asm/virt.h
> > @@ -62,6 +62,8 @@
> >    */
> >   extern u32 __boot_cpu_mode[2];
> >
> > +extern char __hyp_stub_vectors[];
> > +
> >   void __hyp_set_vectors(phys_addr_t phys_vector_base);
> >   void __hyp_reset_vectors(void);
> >
> > diff --git a/arch/arm64/kernel/hyp-stub.S
> > b/arch/arm64/kernel/hyp-stub.S index f17af9a39562..22b728fb14bd
> 100644
> > --- a/arch/arm64/kernel/hyp-stub.S
> > +++ b/arch/arm64/kernel/hyp-stub.S
> > @@ -38,6 +38,7 @@ ENTRY(__hyp_stub_vectors)
> >   	ventry	el1_fiq_invalid			// FIQ 32-bit EL1
> >   	ventry	el1_error_invalid		// Error 32-bit EL1
> >   ENDPROC(__hyp_stub_vectors)
> > +EXPORT_SYMBOL(__hyp_stub_vectors);
> >
> >   	.align 11
> >
> >
> 
> While I would not dislike to have patch-free access in Jailhouse, I'm not sure if
> an out-of-tree use case justifies this an export.
> 
> Also, this lacks the arm equivalent to be complete.

arm and arm64 has different maintainers. If this arm64 is acceptable, I'll create
arm patch and send out.

Thanks,
Peng.

> 
> Jan
> 
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE Corporate
> Competence Center Embedded Linux