linux-kernel - Re: [PATCH v2] xen: fix HYPERVISOR_dm

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Date:   Wed, 7 Jun 2017 11:09:35 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Sergey Dyasli <sergey.dyasli@...rix.com>
cc:     xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org,
        Paul Durrant <paul.durrant@...rix.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Julien Grall <julien.grall@....com>,
        Marc Zyngier <marc.zyngier@....com>,
        Jan Beulich <jbeulich@...e.com>,
        Andrew Cooper <Andrew.Cooper3@...rix.com>
Subject: Re: [PATCH v2] xen: fix HYPERVISOR_dm_op() prototype

On Wed, 7 Jun 2017, Sergey Dyasli wrote:
> Change the third parameter to be the required struct xen_dm_op_buf *
> instead of a generic void * (which blindly accepts any pointer).
> 
> Signed-off-by: Sergey Dyasli <sergey.dyasli@...rix.com>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>


> ---
> v1 --> v2:
> - Replaced "#include <xen/interface/hvm/dm_op.h>" with
>   forward declaration of struct xen_dm_op_buf
> 
>  arch/x86/include/asm/xen/hypercall.h | 4 +++-
>  include/xen/arm/hypercall.h          | 5 ++++-
>  2 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/include/asm/xen/hypercall.h b/arch/x86/include/asm/xen/hypercall.h
> index f6d20f6cca12..7a4db5fefd15 100644
> --- a/arch/x86/include/asm/xen/hypercall.h
> +++ b/arch/x86/include/asm/xen/hypercall.h
> @@ -50,6 +50,8 @@
>  #include <xen/interface/platform.h>
>  #include <xen/interface/xen-mca.h>
>  
> +struct xen_dm_op_buf;
> +
>  /*
>   * The hypercall asms have to meet several constraints:
>   * - Work on 32- and 64-bit.
> @@ -474,7 +476,7 @@ HYPERVISOR_xenpmu_op(unsigned int op, void *arg)
>  
>  static inline int
>  HYPERVISOR_dm_op(
> -	domid_t dom, unsigned int nr_bufs, void *bufs)
> +	domid_t dom, unsigned int nr_bufs, struct xen_dm_op_buf *bufs)
>  {
>  	return _hypercall3(int, dm_op, dom, nr_bufs, bufs);
>  }
> diff --git a/include/xen/arm/hypercall.h b/include/xen/arm/hypercall.h
> index 73db4b2eeb89..b40485e54d80 100644
> --- a/include/xen/arm/hypercall.h
> +++ b/include/xen/arm/hypercall.h
> @@ -39,6 +39,8 @@
>  #include <xen/interface/sched.h>
>  #include <xen/interface/platform.h>
>  
> +struct xen_dm_op_buf;
> +
>  long privcmd_call(unsigned call, unsigned long a1,
>  		unsigned long a2, unsigned long a3,
>  		unsigned long a4, unsigned long a5);
> @@ -53,7 +55,8 @@ 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_vm_assist(unsigned int cmd, unsigned int type);
> -int HYPERVISOR_dm_op(domid_t domid, unsigned int nr_bufs, void *bufs);
> +int HYPERVISOR_dm_op(domid_t domid, unsigned int nr_bufs,
> +		     struct xen_dm_op_buf *bufs);
>  int HYPERVISOR_platform_op_raw(void *arg);
>  static inline int HYPERVISOR_platform_op(struct xen_platform_op *op)
>  {
> -- 
> 2.11.0
>