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Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific UEFI runtime services

Started byStefano Stabellini <stefano.stabellini@eu.citrix.com>
First post2016-01-18 18:10 +0100
Last post2016-01-22 12:10 +0100
Articles 5 — 3 participants

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  Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific  UEFI runtime services Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-01-18 18:10 +0100
    Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific  UEFI runtime services Shannon Zhao <shannon.zhao@linaro.org> - 2016-01-19 14:20 +0100
      Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific  UEFI runtime services Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-01-19 15:30 +0100
    Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific  UEFI runtime services Shannon Zhao <zhaoshenglong@huawei.com> - 2016-01-22 05:00 +0100
      Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific  UEFI runtime services Stefano Stabellini <stefano.stabellini@eu.citrix.com> - 2016-01-22 12:10 +0100

#1311682 — Re: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific UEFI runtime services

FromStefano Stabellini <stefano.stabellini@eu.citrix.com>
Date2016-01-18 18:10 +0100
SubjectRe: [Xen-devel] [PATCH v2 16/16] ARM64: XEN: Initialize Xen specific UEFI runtime services
Message-ID<qSltv-3KT-11@gated-at.bofh.it>
On Fri, 15 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@linaro.org>
> 
> When running on Xen hypervisor, runtime services are supported through
> hypercall. So call Xen specific function to initialize runtime services.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>

Thanks Shannon, much much better!  Just a couple of questions.


>  arch/arm/xen/enlighten.c |  5 +++++
>  arch/arm64/xen/Makefile  |  1 +
>  arch/arm64/xen/efi.c     | 36 ++++++++++++++++++++++++++++++++++++
>  drivers/xen/Kconfig      |  2 +-
>  include/xen/xen-ops.h    |  1 +
>  5 files changed, 44 insertions(+), 1 deletion(-)
>  create mode 100644 arch/arm64/xen/efi.c
> 
> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> index 485e117..84f27ec 100644
> --- a/arch/arm/xen/enlighten.c
> +++ b/arch/arm/xen/enlighten.c
> @@ -414,6 +414,11 @@ static int __init xen_guest_init(void)
>  	if (xen_initial_domain())
>  		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
>  
> +	if (IS_ENABLED(CONFIG_XEN_EFI)) {
> +		if (efi_enabled(EFI_PARAVIRT))
> +			xen_efi_runtime_setup();
> +	}
> +
>  	return 0;
>  }
>  early_initcall(xen_guest_init);
> diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
> index 74a8d87..62e6fe2 100644
> --- a/arch/arm64/xen/Makefile
> +++ b/arch/arm64/xen/Makefile
> @@ -1,2 +1,3 @@
>  xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o mm.o)
>  obj-y		:= xen-arm.o hypercall.o
> +obj-$(CONFIG_XEN_EFI) += efi.o
> diff --git a/arch/arm64/xen/efi.c b/arch/arm64/xen/efi.c
> new file mode 100644
> index 0000000..33046b0
> --- /dev/null
> +++ b/arch/arm64/xen/efi.c
> @@ -0,0 +1,36 @@
> +/*
> + * Copyright (c) 2015, Linaro Limited, Shannon Zhao
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * 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/>.
> + */
> +
> +#include <linux/efi.h>
> +#include <xen/xen-ops.h>
> +
> +void __init xen_efi_runtime_setup(void)
> +{
> +	efi.get_time                 = xen_efi_get_time;
> +	efi.set_time                 = xen_efi_set_time;
> +	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
> +	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
> +	efi.get_variable             = xen_efi_get_variable;
> +	efi.get_next_variable        = xen_efi_get_next_variable;
> +	efi.set_variable             = xen_efi_set_variable;
> +	efi.query_variable_info      = xen_efi_query_variable_info;
> +	efi.update_capsule           = xen_efi_update_capsule;
> +	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
> +	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
> +	efi.reset_system             = NULL;
> +}
> +EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);

This looks very similar to struct efi efi_xen previously in
drivers/xen/efi.c.  Maybe it makes sense to leave struct efi efi_xen in
drivers/xen/efi.c, export it in include/xen/xen-ops.h, then here just:

  efi = efi_xen;

Would that improve code readability?


Correct me if I am wrong, but on ARM64 (differently from x86) it is not
necessary to set efi.systab because it is not used, right? If so, it
would be best to add a comment here to remember.


> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> index 73708ac..27d216a 100644
> --- a/drivers/xen/Kconfig
> +++ b/drivers/xen/Kconfig
> @@ -268,7 +268,7 @@ config XEN_HAVE_PVMMU
>  
>  config XEN_EFI
>  	def_bool y
> -	depends on X86_64 && EFI
> +	depends on (ARM64 || X86_64) && EFI
>  
>  config XEN_AUTO_XLATE
>  	def_bool y
> diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
> index c83a338..36ff8e4 100644
> --- a/include/xen/xen-ops.h
> +++ b/include/xen/xen-ops.h
> @@ -107,6 +107,7 @@ efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
>  efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
>  					unsigned long count, u64 *max_size,
>  					int *reset_type);
> +void xen_efi_runtime_setup(void);

xen_efi_runtime_setup is not defined on x86, but this header is not arch
specific.

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#1312200

FromShannon Zhao <shannon.zhao@linaro.org>
Date2016-01-19 14:20 +0100
Message-ID<qSEmu-8o1-5@gated-at.bofh.it>
In reply to#1311682

On 2016/1/19 1:03, Stefano Stabellini wrote:
> On Fri, 15 Jan 2016, Shannon Zhao wrote:
>> From: Shannon Zhao <shannon.zhao@linaro.org>
>>
>> When running on Xen hypervisor, runtime services are supported through
>> hypercall. So call Xen specific function to initialize runtime services.
>>
>> Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
>
> Thanks Shannon, much much better!  Just a couple of questions.
>
>
>>   arch/arm/xen/enlighten.c |  5 +++++
>>   arch/arm64/xen/Makefile  |  1 +
>>   arch/arm64/xen/efi.c     | 36 ++++++++++++++++++++++++++++++++++++
>>   drivers/xen/Kconfig      |  2 +-
>>   include/xen/xen-ops.h    |  1 +
>>   5 files changed, 44 insertions(+), 1 deletion(-)
>>   create mode 100644 arch/arm64/xen/efi.c
>>
>> diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
>> index 485e117..84f27ec 100644
>> --- a/arch/arm/xen/enlighten.c
>> +++ b/arch/arm/xen/enlighten.c
>> @@ -414,6 +414,11 @@ static int __init xen_guest_init(void)
>>   	if (xen_initial_domain())
>>   		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
>>
>> +	if (IS_ENABLED(CONFIG_XEN_EFI)) {
>> +		if (efi_enabled(EFI_PARAVIRT))
>> +			xen_efi_runtime_setup();
>> +	}
>> +
>>   	return 0;
>>   }
>>   early_initcall(xen_guest_init);
>> diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
>> index 74a8d87..62e6fe2 100644
>> --- a/arch/arm64/xen/Makefile
>> +++ b/arch/arm64/xen/Makefile
>> @@ -1,2 +1,3 @@
>>   xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o mm.o)
>>   obj-y		:= xen-arm.o hypercall.o
>> +obj-$(CONFIG_XEN_EFI) += efi.o
>> diff --git a/arch/arm64/xen/efi.c b/arch/arm64/xen/efi.c
>> new file mode 100644
>> index 0000000..33046b0
>> --- /dev/null
>> +++ b/arch/arm64/xen/efi.c
>> @@ -0,0 +1,36 @@
>> +/*
>> + * Copyright (c) 2015, Linaro Limited, Shannon Zhao
>> + *
>> + * This program is free software; you can redistribute it and/or modify
>> + * it under the terms of the GNU General Public License as published by
>> + * the Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * 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/>.
>> + */
>> +
>> +#include <linux/efi.h>
>> +#include <xen/xen-ops.h>
>> +
>> +void __init xen_efi_runtime_setup(void)
>> +{
>> +	efi.get_time                 = xen_efi_get_time;
>> +	efi.set_time                 = xen_efi_set_time;
>> +	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
>> +	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
>> +	efi.get_variable             = xen_efi_get_variable;
>> +	efi.get_next_variable        = xen_efi_get_next_variable;
>> +	efi.set_variable             = xen_efi_set_variable;
>> +	efi.query_variable_info      = xen_efi_query_variable_info;
>> +	efi.update_capsule           = xen_efi_update_capsule;
>> +	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
>> +	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
>> +	efi.reset_system             = NULL;
>> +}
>> +EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);
>
> This looks very similar to struct efi efi_xen previously in
> drivers/xen/efi.c.  Maybe it makes sense to leave struct efi efi_xen in
> drivers/xen/efi.c, export it in include/xen/xen-ops.h, then here just:
>
>    efi = efi_xen;
>
> Would that improve code readability?
>
Ok.
>
> Correct me if I am wrong, but on ARM64 (differently from x86) it is not
> necessary to set efi.systab because it is not used, right? If so, it
> would be best to add a comment here to remember.
>
Not set efi.systab here because it gets the system table through fdt and 
set efi.systab there. See uefi_init() in arch/arm64/kernel.efi.c

	efi.systab = early_memremap(efi_system_table,
				    sizeof(efi_system_table_t));
>
>> diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
>> index 73708ac..27d216a 100644
>> --- a/drivers/xen/Kconfig
>> +++ b/drivers/xen/Kconfig
>> @@ -268,7 +268,7 @@ config XEN_HAVE_PVMMU
>>
>>   config XEN_EFI
>>   	def_bool y
>> -	depends on X86_64 && EFI
>> +	depends on (ARM64 || X86_64) && EFI
>>
>>   config XEN_AUTO_XLATE
>>   	def_bool y
>> diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
>> index c83a338..36ff8e4 100644
>> --- a/include/xen/xen-ops.h
>> +++ b/include/xen/xen-ops.h
>> @@ -107,6 +107,7 @@ efi_status_t xen_efi_update_capsule(efi_capsule_header_t **capsules,
>>   efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
>>   					unsigned long count, u64 *max_size,
>>   					int *reset_type);
>> +void xen_efi_runtime_setup(void);
>
> xen_efi_runtime_setup is not defined on x86, but this header is not arch
> specific.
>

-- 
Shannon

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#1312292

FromStefano Stabellini <stefano.stabellini@eu.citrix.com>
Date2016-01-19 15:30 +0100
Message-ID<qSFsf-Eb-41@gated-at.bofh.it>
In reply to#1312200
On Tue, 19 Jan 2016, Shannon Zhao wrote:
> On 2016/1/19 1:03, Stefano Stabellini wrote:
> > On Fri, 15 Jan 2016, Shannon Zhao wrote:
> > > From: Shannon Zhao <shannon.zhao@linaro.org>
> > > 
> > > When running on Xen hypervisor, runtime services are supported through
> > > hypercall. So call Xen specific function to initialize runtime services.
> > > 
> > > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> > 
> > Thanks Shannon, much much better!  Just a couple of questions.
> > 
> > 
> > >   arch/arm/xen/enlighten.c |  5 +++++
> > >   arch/arm64/xen/Makefile  |  1 +
> > >   arch/arm64/xen/efi.c     | 36 ++++++++++++++++++++++++++++++++++++
> > >   drivers/xen/Kconfig      |  2 +-
> > >   include/xen/xen-ops.h    |  1 +
> > >   5 files changed, 44 insertions(+), 1 deletion(-)
> > >   create mode 100644 arch/arm64/xen/efi.c
> > > 
> > > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> > > index 485e117..84f27ec 100644
> > > --- a/arch/arm/xen/enlighten.c
> > > +++ b/arch/arm/xen/enlighten.c
> > > @@ -414,6 +414,11 @@ static int __init xen_guest_init(void)
> > >   	if (xen_initial_domain())
> > >   		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
> > > 
> > > +	if (IS_ENABLED(CONFIG_XEN_EFI)) {
> > > +		if (efi_enabled(EFI_PARAVIRT))
> > > +			xen_efi_runtime_setup();
> > > +	}
> > > +
> > >   	return 0;
> > >   }
> > >   early_initcall(xen_guest_init);
> > > diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
> > > index 74a8d87..62e6fe2 100644
> > > --- a/arch/arm64/xen/Makefile
> > > +++ b/arch/arm64/xen/Makefile
> > > @@ -1,2 +1,3 @@
> > >   xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o
> > > mm.o)
> > >   obj-y		:= xen-arm.o hypercall.o
> > > +obj-$(CONFIG_XEN_EFI) += efi.o
> > > diff --git a/arch/arm64/xen/efi.c b/arch/arm64/xen/efi.c
> > > new file mode 100644
> > > index 0000000..33046b0
> > > --- /dev/null
> > > +++ b/arch/arm64/xen/efi.c
> > > @@ -0,0 +1,36 @@
> > > +/*
> > > + * Copyright (c) 2015, Linaro Limited, Shannon Zhao
> > > + *
> > > + * This program is free software; you can redistribute it and/or modify
> > > + * it under the terms of the GNU General Public License as published by
> > > + * the Free Software Foundation; either version 2 of the License, or
> > > + * (at your option) any later version.
> > > + *
> > > + * 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/>.
> > > + */
> > > +
> > > +#include <linux/efi.h>
> > > +#include <xen/xen-ops.h>
> > > +
> > > +void __init xen_efi_runtime_setup(void)
> > > +{
> > > +	efi.get_time                 = xen_efi_get_time;
> > > +	efi.set_time                 = xen_efi_set_time;
> > > +	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
> > > +	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
> > > +	efi.get_variable             = xen_efi_get_variable;
> > > +	efi.get_next_variable        = xen_efi_get_next_variable;
> > > +	efi.set_variable             = xen_efi_set_variable;
> > > +	efi.query_variable_info      = xen_efi_query_variable_info;
> > > +	efi.update_capsule           = xen_efi_update_capsule;
> > > +	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
> > > +	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
> > > +	efi.reset_system             = NULL;
> > > +}
> > > +EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);
> > 
> > This looks very similar to struct efi efi_xen previously in
> > drivers/xen/efi.c.  Maybe it makes sense to leave struct efi efi_xen in
> > drivers/xen/efi.c, export it in include/xen/xen-ops.h, then here just:
> > 
> >    efi = efi_xen;
> > 
> > Would that improve code readability?
> > 
> Ok.
> > 
> > Correct me if I am wrong, but on ARM64 (differently from x86) it is not
> > necessary to set efi.systab because it is not used, right? If so, it
> > would be best to add a comment here to remember.
> > 
> Not set efi.systab here because it gets the system table through fdt and set
> efi.systab there. See uefi_init() in arch/arm64/kernel.efi.c
> 
> 	efi.systab = early_memremap(efi_system_table,
> 				    sizeof(efi_system_table_t));

I see now. Then it might be still good to add a comment about that.


> > > diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
> > > index 73708ac..27d216a 100644
> > > --- a/drivers/xen/Kconfig
> > > +++ b/drivers/xen/Kconfig
> > > @@ -268,7 +268,7 @@ config XEN_HAVE_PVMMU
> > > 
> > >   config XEN_EFI
> > >   	def_bool y
> > > -	depends on X86_64 && EFI
> > > +	depends on (ARM64 || X86_64) && EFI
> > > 
> > >   config XEN_AUTO_XLATE
> > >   	def_bool y
> > > diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
> > > index c83a338..36ff8e4 100644
> > > --- a/include/xen/xen-ops.h
> > > +++ b/include/xen/xen-ops.h
> > > @@ -107,6 +107,7 @@ efi_status_t
> > > xen_efi_update_capsule(efi_capsule_header_t **capsules,
> > >   efi_status_t xen_efi_query_capsule_caps(efi_capsule_header_t **capsules,
> > >   					unsigned long count, u64 *max_size,
> > >   					int *reset_type);
> > > +void xen_efi_runtime_setup(void);
> > 
> > xen_efi_runtime_setup is not defined on x86, but this header is not arch
> > specific.
> > 
> 
> -- 
> Shannon
>

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#1314737

FromShannon Zhao <zhaoshenglong@huawei.com>
Date2016-01-22 05:00 +0100
Message-ID<qTB3c-6EO-5@gated-at.bofh.it>
In reply to#1311682

On 2016/1/19 1:03, Stefano Stabellini wrote:
> On Fri, 15 Jan 2016, Shannon Zhao wrote:
>> > From: Shannon Zhao <shannon.zhao@linaro.org>
>> > 
>> > When running on Xen hypervisor, runtime services are supported through
>> > hypercall. So call Xen specific function to initialize runtime services.
>> > 
>> > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> Thanks Shannon, much much better!  Just a couple of questions.
> 
> 
>> >  arch/arm/xen/enlighten.c |  5 +++++
>> >  arch/arm64/xen/Makefile  |  1 +
>> >  arch/arm64/xen/efi.c     | 36 ++++++++++++++++++++++++++++++++++++
>> >  drivers/xen/Kconfig      |  2 +-
>> >  include/xen/xen-ops.h    |  1 +
>> >  5 files changed, 44 insertions(+), 1 deletion(-)
>> >  create mode 100644 arch/arm64/xen/efi.c
>> > 
>> > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
>> > index 485e117..84f27ec 100644
>> > --- a/arch/arm/xen/enlighten.c
>> > +++ b/arch/arm/xen/enlighten.c
>> > @@ -414,6 +414,11 @@ static int __init xen_guest_init(void)
>> >  	if (xen_initial_domain())
>> >  		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
>> >  
>> > +	if (IS_ENABLED(CONFIG_XEN_EFI)) {
>> > +		if (efi_enabled(EFI_PARAVIRT))
>> > +			xen_efi_runtime_setup();
>> > +	}
>> > +
>> >  	return 0;
>> >  }
>> >  early_initcall(xen_guest_init);
>> > diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
>> > index 74a8d87..62e6fe2 100644
>> > --- a/arch/arm64/xen/Makefile
>> > +++ b/arch/arm64/xen/Makefile
>> > @@ -1,2 +1,3 @@
>> >  xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o mm.o)
>> >  obj-y		:= xen-arm.o hypercall.o
>> > +obj-$(CONFIG_XEN_EFI) += efi.o
>> > diff --git a/arch/arm64/xen/efi.c b/arch/arm64/xen/efi.c
>> > new file mode 100644
>> > index 0000000..33046b0
>> > --- /dev/null
>> > +++ b/arch/arm64/xen/efi.c
>> > @@ -0,0 +1,36 @@
>> > +/*
>> > + * Copyright (c) 2015, Linaro Limited, Shannon Zhao
>> > + *
>> > + * This program is free software; you can redistribute it and/or modify
>> > + * it under the terms of the GNU General Public License as published by
>> > + * the Free Software Foundation; either version 2 of the License, or
>> > + * (at your option) any later version.
>> > + *
>> > + * 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/>.
>> > + */
>> > +
>> > +#include <linux/efi.h>
>> > +#include <xen/xen-ops.h>
>> > +
>> > +void __init xen_efi_runtime_setup(void)
>> > +{
>> > +	efi.get_time                 = xen_efi_get_time;
>> > +	efi.set_time                 = xen_efi_set_time;
>> > +	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
>> > +	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
>> > +	efi.get_variable             = xen_efi_get_variable;
>> > +	efi.get_next_variable        = xen_efi_get_next_variable;
>> > +	efi.set_variable             = xen_efi_set_variable;
>> > +	efi.query_variable_info      = xen_efi_query_variable_info;
>> > +	efi.update_capsule           = xen_efi_update_capsule;
>> > +	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
>> > +	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
>> > +	efi.reset_system             = NULL;
>> > +}
>> > +EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);
> This looks very similar to struct efi efi_xen previously in
> drivers/xen/efi.c.  Maybe it makes sense to leave struct efi efi_xen in
> drivers/xen/efi.c, export it in include/xen/xen-ops.h, then here just:
> 
>   efi = efi_xen;
> 
> Would that improve code readability?

Rethink about this. It's a little different on ARM since we call
xen_efi_runtime_setup after parsing the FDT and setting some members of
efi already, e.g. efi.systab, efi.acpi20. So it necessary to have a
different way to initialize the struct efi.

Thanks,
-- 
Shannon

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#1314901

FromStefano Stabellini <stefano.stabellini@eu.citrix.com>
Date2016-01-22 12:10 +0100
Message-ID<qTHLl-3dT-49@gated-at.bofh.it>
In reply to#1314737
On Fri, 22 Jan 2016, Shannon Zhao wrote:
> On 2016/1/19 1:03, Stefano Stabellini wrote:
> > On Fri, 15 Jan 2016, Shannon Zhao wrote:
> >> > From: Shannon Zhao <shannon.zhao@linaro.org>
> >> > 
> >> > When running on Xen hypervisor, runtime services are supported through
> >> > hypercall. So call Xen specific function to initialize runtime services.
> >> > 
> >> > Signed-off-by: Shannon Zhao <shannon.zhao@linaro.org>
> > Thanks Shannon, much much better!  Just a couple of questions.
> > 
> > 
> >> >  arch/arm/xen/enlighten.c |  5 +++++
> >> >  arch/arm64/xen/Makefile  |  1 +
> >> >  arch/arm64/xen/efi.c     | 36 ++++++++++++++++++++++++++++++++++++
> >> >  drivers/xen/Kconfig      |  2 +-
> >> >  include/xen/xen-ops.h    |  1 +
> >> >  5 files changed, 44 insertions(+), 1 deletion(-)
> >> >  create mode 100644 arch/arm64/xen/efi.c
> >> > 
> >> > diff --git a/arch/arm/xen/enlighten.c b/arch/arm/xen/enlighten.c
> >> > index 485e117..84f27ec 100644
> >> > --- a/arch/arm/xen/enlighten.c
> >> > +++ b/arch/arm/xen/enlighten.c
> >> > @@ -414,6 +414,11 @@ static int __init xen_guest_init(void)
> >> >  	if (xen_initial_domain())
> >> >  		pvclock_gtod_register_notifier(&xen_pvclock_gtod_notifier);
> >> >  
> >> > +	if (IS_ENABLED(CONFIG_XEN_EFI)) {
> >> > +		if (efi_enabled(EFI_PARAVIRT))
> >> > +			xen_efi_runtime_setup();
> >> > +	}
> >> > +
> >> >  	return 0;
> >> >  }
> >> >  early_initcall(xen_guest_init);
> >> > diff --git a/arch/arm64/xen/Makefile b/arch/arm64/xen/Makefile
> >> > index 74a8d87..62e6fe2 100644
> >> > --- a/arch/arm64/xen/Makefile
> >> > +++ b/arch/arm64/xen/Makefile
> >> > @@ -1,2 +1,3 @@
> >> >  xen-arm-y	+= $(addprefix ../../arm/xen/, enlighten.o grant-table.o p2m.o mm.o)
> >> >  obj-y		:= xen-arm.o hypercall.o
> >> > +obj-$(CONFIG_XEN_EFI) += efi.o
> >> > diff --git a/arch/arm64/xen/efi.c b/arch/arm64/xen/efi.c
> >> > new file mode 100644
> >> > index 0000000..33046b0
> >> > --- /dev/null
> >> > +++ b/arch/arm64/xen/efi.c
> >> > @@ -0,0 +1,36 @@
> >> > +/*
> >> > + * Copyright (c) 2015, Linaro Limited, Shannon Zhao
> >> > + *
> >> > + * This program is free software; you can redistribute it and/or modify
> >> > + * it under the terms of the GNU General Public License as published by
> >> > + * the Free Software Foundation; either version 2 of the License, or
> >> > + * (at your option) any later version.
> >> > + *
> >> > + * 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/>.
> >> > + */
> >> > +
> >> > +#include <linux/efi.h>
> >> > +#include <xen/xen-ops.h>
> >> > +
> >> > +void __init xen_efi_runtime_setup(void)
> >> > +{
> >> > +	efi.get_time                 = xen_efi_get_time;
> >> > +	efi.set_time                 = xen_efi_set_time;
> >> > +	efi.get_wakeup_time          = xen_efi_get_wakeup_time;
> >> > +	efi.set_wakeup_time          = xen_efi_set_wakeup_time;
> >> > +	efi.get_variable             = xen_efi_get_variable;
> >> > +	efi.get_next_variable        = xen_efi_get_next_variable;
> >> > +	efi.set_variable             = xen_efi_set_variable;
> >> > +	efi.query_variable_info      = xen_efi_query_variable_info;
> >> > +	efi.update_capsule           = xen_efi_update_capsule;
> >> > +	efi.query_capsule_caps       = xen_efi_query_capsule_caps;
> >> > +	efi.get_next_high_mono_count = xen_efi_get_next_high_mono_count;
> >> > +	efi.reset_system             = NULL;
> >> > +}
> >> > +EXPORT_SYMBOL_GPL(xen_efi_runtime_setup);
> > This looks very similar to struct efi efi_xen previously in
> > drivers/xen/efi.c.  Maybe it makes sense to leave struct efi efi_xen in
> > drivers/xen/efi.c, export it in include/xen/xen-ops.h, then here just:
> > 
> >   efi = efi_xen;
> > 
> > Would that improve code readability?
> 
> Rethink about this. It's a little different on ARM since we call
> xen_efi_runtime_setup after parsing the FDT and setting some members of
> efi already, e.g. efi.systab, efi.acpi20. So it necessary to have a
> different way to initialize the struct efi.

OK, fair enough.

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