linux-kernel - Re: [Xen-devel] [PATCH v4 2/7] xen/arm: introduce HYPERVISOR_platform

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Date:	Fri, 13 Nov 2015 13:40:56 +0000
From:	Julien Grall <julien.grall@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	<xen-devel@...ts.xensource.com>
CC:	<linux-kernel@...r.kernel.org>, <Ian.Campbell@...rix.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v4 2/7] xen/arm: introduce HYPERVISOR_platform_op
 on arm and arm64

Hi Stefano,

On 12/11/15 17:30, Stefano Stabellini wrote:
> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> 
> ---
> 
> Changes in v2:
> - rename dom0_op to platform_op
> ---
>  arch/arm/include/asm/xen/hypercall.h |    2 ++
>  arch/arm/xen/enlighten.c             |    1 +
>  arch/arm/xen/hypercall.S             |    1 +
>  arch/arm64/xen/hypercall.S           |    1 +
>  4 files changed, 5 insertions(+)
> 
> diff --git a/arch/arm/include/asm/xen/hypercall.h b/arch/arm/include/asm/xen/hypercall.h
> index 712b50e..c3e00d0 100644
> --- a/arch/arm/include/asm/xen/hypercall.h
> +++ b/arch/arm/include/asm/xen/hypercall.h
> @@ -35,6 +35,7 @@
>  
>  #include <xen/interface/xen.h>
>  #include <xen/interface/sched.h>
> +#include <xen/interface/platform.h>
>  
>  long privcmd_call(unsigned call, unsigned long a1,
>  		unsigned long a2, unsigned long a3,
> @@ -49,6 +50,7 @@ int HYPERVISOR_memory_op(unsigned int cmd, void *arg);
>  int HYPERVISOR_physdev_op(int cmd, void *arg);
>  int HYPERVISOR_vcpu_op(int cmd, int vcpuid, void *extra_args);
>  int HYPERVISOR_tmem_op(void *arg);
> +int HYPERVISOR_platform_op(void *arg);

int HYPERVISOR_platform_op(struct xen_platform_op *platform_op) to allow
compiler type checking and match the x86 version.

Also, the implementation of the helper differ from x86. On x86, the
helper takes care of setting the interface_version while here you
request the caller to do it.

It's better if we have similar requirement across the architecture as
this helpers may be called from common code.

>  int HYPERVISOR_multicall(struct multicall_entry *calls, uint32_t nr);
>  
>  static inline int

Regards,

-- 
Julien Grall
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