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

[Marc Zyngier]

On 30/11/15 20:00, Christoffer Dall wrote:
> On Fri, Nov 27, 2015 at 06:49:56PM +, 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 
>> ---
>>  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 000..dac843e
>> --- /dev/null
>> +++ b/arch/arm64/kvm/hyp/hyp.h
>> @@ -0,0 +1,31 @@
>> +/*
>> + * Copyright (C) 2015 - ARM Ltd
>> + * Author: Marc Zyngier 
>> + *
>> + * 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 .
>> + */
>> +
>> +#ifndef __ARM64_KVM_HYP_H__
>> +#define __ARM64_KVM_HYP_H__
>> +
>> +#include 
>> +#include 
>> +#include 
>> +#include 
>> +
>> +#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.

>> +
>> +#define kern_hyp_va(v) (typeof(v))((unsigned long)v & HYP_PAGE_OFFSET_MASK)
> 
> should you have parenthesis around 'v' ?

Yup.

Thanks,

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

[Christoffer Dall]

On Tue, Dec 01, 2015 at 11:41:08AM +, Marc Zyngier wrote:
> On 30/11/15 20:00, Christoffer Dall wrote:
> > On Fri, Nov 27, 2015 at 06:49:56PM +, 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 
> >> ---
> >>  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 000..dac843e
> >> --- /dev/null
> >> +++ b/arch/arm64/kvm/hyp/hyp.h
> >> @@ -0,0 +1,31 @@
> >> +/*
> >> + * Copyright (C) 2015 - ARM Ltd
> >> + * Author: Marc Zyngier 
> >> + *
> >> + * 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 .
> >> + */
> >> +
> >> +#ifndef __ARM64_KVM_HYP_H__
> >> +#define __ARM64_KVM_HYP_H__
> >> +
> >> +#include 
> >> +#include 
> >> +#include 
> >> +#include 
> >> +
> >> +#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...
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Re: [PATCH v2 02/21] arm64: KVM: Add a HYP-specific header file

[Christoffer Dall]

On Fri, Nov 27, 2015 at 06:49:56PM +, 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 
> ---
>  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 000..dac843e
> --- /dev/null
> +++ b/arch/arm64/kvm/hyp/hyp.h
> @@ -0,0 +1,31 @@
> +/*
> + * Copyright (C) 2015 - ARM Ltd
> + * Author: Marc Zyngier 
> + *
> + * 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 .
> + */
> +
> +#ifndef __ARM64_KVM_HYP_H__
> +#define __ARM64_KVM_HYP_H__
> +
> +#include 
> +#include 
> +#include 
> +#include 
> +
> +#define __hyp_text __section(.hyp.text) notrace

why notrace?

> +
> +#define kern_hyp_va(v) (typeof(v))((unsigned long)v & HYP_PAGE_OFFSET_MASK)

should you have parenthesis around 'v' ?

> +
> +#endif /* __ARM64_KVM_HYP_H__ */
> +
> -- 
> 2.1.4
> 
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[PATCH v2 02/21] arm64: KVM: Add a HYP-specific header file

[Marc Zyngier]

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 
---
 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 000..dac843e
--- /dev/null
+++ b/arch/arm64/kvm/hyp/hyp.h
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2015 - ARM Ltd
+ * Author: Marc Zyngier 
+ *
+ * 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 .
+ */
+
+#ifndef __ARM64_KVM_HYP_H__
+#define __ARM64_KVM_HYP_H__
+
+#include 
+#include 
+#include 
+#include 
+
+#define __hyp_text __section(.hyp.text) notrace
+
+#define kern_hyp_va(v) (typeof(v))((unsigned long)v & HYP_PAGE_OFFSET_MASK)
+
+#endif /* __ARM64_KVM_HYP_H__ */
+
-- 
2.1.4

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