Re: [Xen-devel] [PATCH v3 1/3] x86/hvm: Add check when register io handler

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: suravee.suthikulpanit@xxxxxxx
> [mailto:suravee.suthikulpanit@xxxxxxx]
> Sent: 22 May 2016 00:42
> To: xen-devel@xxxxxxxxxxxxx; Paul Durrant; jbeulich@xxxxxxxx; George
> Dunlap
> Cc: Keir (Xen.org); Suravee Suthikulpanit; Suravee Suthikulpanit
> Subject: [PATCH v3 1/3] x86/hvm: Add check when register io handler
> 
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
> 
> At the time of registering HVM I/O handler, the HVM domain might
> not have been initialized, which means the hvm_domain.io_handler
> would be NULL. In the hvm_next_io_handler(), this should be asserted.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
> ---
>  xen/arch/x86/hvm/intercept.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/xen/arch/x86/hvm/intercept.c b/xen/arch/x86/hvm/intercept.c
> index fc757d0..2f8d57f 100644
> --- a/xen/arch/x86/hvm/intercept.c
> +++ b/xen/arch/x86/hvm/intercept.c
> @@ -258,6 +258,8 @@ struct hvm_io_handler *hvm_next_io_handler(struct
> domain *d)
>  {
>      unsigned int i = d->arch.hvm_domain.io_handler_count++;
> 
> +    ASSERT( d->arch.hvm_domain.io_handler );

Needs fixing for style, but with that...

Reviewed-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

> +
>      if ( i == NR_IO_HANDLERS )
>      {
>          domain_crash(d);
> --
> 1.9.1


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