Re: [Xen-devel] [PATCH] mem_access: fix setting default mem_access type

[Keir Fraser <keir@xxxxxxx>]

On 18/04/2012 02:09, "Aravindh Puthiyaparambil" <aravindh@xxxxxxxxxxxx>
wrote:

> When xc_hvm_set_mem_access(xch, domain_id, default_access, ~0ull, 0)
> is called, first_pfn=~0ull is a hint to HVMOP_set_mem_access as to
> what the default mem_access type is for the domain. This call was
> failing because it was gated by the memory range check in the
> HVMOP_set_mem_access case statement in do_hvm_op(). The following
> patch fixes this issue.
> 
> Signed-off-by: Aravindh Puthiyaparambil <aravindh@xxxxxxxxxxxx>

Looks okay to me. Probably should be checked and applied by Tim.

 -- Keir

> ---
>  xen/arch/x86/hvm/hvm.c |  5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff -r a06e6cdeafe3 xen/arch/x86/hvm/hvm.c
> --- a/xen/arch/x86/hvm/hvm.c Mon Apr 16 13:05:28 2012 +0200
> +++ b/xen/arch/x86/hvm/hvm.c Tue Apr 17 18:03:37 2012 -0700
> @@ -4170,9 +4170,10 @@
>              goto param_fail5;
> 
>          rc = -EINVAL;
> -        if ( (a.first_pfn > domain_get_maximum_gpfn(d)) ||
> +        if ( (a.first_pfn != ~0ull) &&
> +             ((a.first_pfn > domain_get_maximum_gpfn(d)) ||
>               ((a.first_pfn + a.nr - 1) < a.first_pfn) ||
> -             ((a.first_pfn + a.nr - 1) > domain_get_maximum_gpfn(d)) )
> +             ((a.first_pfn + a.nr - 1) > domain_get_maximum_gpfn(d))) )
>              goto param_fail5;
> 
>          rc = p2m_set_mem_access(d, a.first_pfn, a.nr, a.hvmmem_access);
> 
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