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Message-ID: <20201117194118.GF10393@kernel.org>
Date: Tue, 17 Nov 2020 21:41:18 +0200
From: Jarkko Sakkinen <jarkko@...nel.org>
To: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org, linux-sgx@...r.kernel.org,
linux-kernel@...r.kernel.org,
Sean Christopherson <sean.j.christopherson@...el.com>,
Andy Lutomirski <luto@...capital.net>,
Jethro Beekman <jethro@...tanix.com>,
Cedric Xing <cedric.xing@...el.com>, akpm@...ux-foundation.org,
andriy.shevchenko@...ux.intel.com, asapek@...gle.com,
chenalexchen@...gle.com, conradparker@...gle.com,
cyhanish@...gle.com, dave.hansen@...el.com, haitao.huang@...el.com,
kai.huang@...el.com, kai.svahn@...el.com, kmoy@...gle.com,
ludloff@...gle.com, luto@...nel.org, nhorman@...hat.com,
npmccallum@...hat.com, puiterwijk@...hat.com, rientjes@...gle.com,
tglx@...utronix.de, yaozhangx@...gle.com, mikko.ylinen@...el.com
Subject: Re: [PATCH v41 19/24] x86/vdso: Implement a vDSO for Intel SGX
enclave call
On Tue, Nov 17, 2020 at 02:14:02PM +0100, Borislav Petkov wrote:
> On Fri, Nov 13, 2020 at 12:01:30AM +0200, Jarkko Sakkinen wrote:
> > diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
> > index 2ad757fb3c23..9915fbd34264 100644
> > --- a/arch/x86/entry/vdso/Makefile
> > +++ b/arch/x86/entry/vdso/Makefile
> > @@ -27,6 +27,7 @@ VDSO32-$(CONFIG_IA32_EMULATION) := y
> > vobjs-y := vdso-note.o vclock_gettime.o vgetcpu.o
> > vobjs32-y := vdso32/note.o vdso32/system_call.o vdso32/sigreturn.o
> > vobjs32-y += vdso32/vclock_gettime.o
> > +vobjs-$(VDSO64-y) += vsgx.o
>
> Why?
>
> This needs to be CONFIG_X86_SGX as you need this vdso functionality only
> when SGX is enabled.
Agreed.
> --
> Regards/Gruss,
> Boris.
>
> https://people.kernel.org/tglx/notes-about-netiquette
/Jarkko
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