[PATCH v2 02/21] arm64: KVM: Add a HYP-specific header file

[christoffer.dall@linaro.org (Christoffer Dall)]

On Tue, Dec 01, 2015 at 11:41:08AM +0000, Marc Zyngier wrote:
> On 30/11/15 20:00, Christoffer Dall wrote:
> > On Fri, Nov 27, 2015 at 06:49:56PM +0000, Marc Zyngier wrote:
> >> In order to expose the various EL2 services that are private to
> >> the hypervisor, add a new hyp.h file.
> >>
> >> So far, it only contains mundane things such as section annotation
> >> and VA manipulation.
> >>
> >> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> >> ---
> >>  arch/arm64/kvm/hyp/hyp.h | 31 +++++++++++++++++++++++++++++++
> >>  1 file changed, 31 insertions(+)
> >>  create mode 100644 arch/arm64/kvm/hyp/hyp.h
> >>
> >> diff --git a/arch/arm64/kvm/hyp/hyp.h b/arch/arm64/kvm/hyp/hyp.h
> >> new file mode 100644
> >> index 0000000..dac843e
> >> --- /dev/null
> >> +++ b/arch/arm64/kvm/hyp/hyp.h
> >> @@ -0,0 +1,31 @@
> >> +/*
> >> + * Copyright (C) 2015 - ARM Ltd
> >> + * Author: Marc Zyngier <marc.zyngier@arm.com>
> >> + *
> >> + * This program is free software; you can redistribute it and/or modify
> >> + * it under the terms of the GNU General Public License version 2 as
> >> + * published by the Free Software Foundation.
> >> + *
> >> + * This program is distributed in the hope that it will be useful,
> >> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> >> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> >> + * GNU General Public License for more details.
> >> + *
> >> + * You should have received a copy of the GNU General Public License
> >> + * along with this program.  If not, see <http://www.gnu.org/licenses/>.
> >> + */
> >> +
> >> +#ifndef __ARM64_KVM_HYP_H__
> >> +#define __ARM64_KVM_HYP_H__
> >> +
> >> +#include <linux/compiler.h>
> >> +#include <linux/kvm_host.h>
> >> +#include <asm/kvm_mmu.h>
> >> +#include <asm/sysreg.h>
> >> +
> >> +#define __hyp_text __section(.hyp.text) notrace
> > 
> > why notrace?
> 
> Because you'd end with calls to mcount in each function prologue, and
> that doesn't really well for stuff that is not executed in the kernel
> address space.

right, makes good sense.

> 
> >> +
> >> +#define kern_hyp_va(v) (typeof(v))((unsigned long)v & HYP_PAGE_OFFSET_MASK)
> > 
> > should you have parenthesis around 'v' ?
> 
> Yup.
> 
> Thanks,
> 
> 	M.
> -- 
> Jazz is not dead. It just smells funny...