Re: [Xen-devel] [PATCH v2 3/3] x86/shadow: emulate_gva_to_mfn() should respect p2m_ioreq_server

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: 15 November 2018 12:52
> To: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
> Cc: Andrew Cooper <Andrew.Cooper3@xxxxxxxxxx>; Paul Durrant
> <Paul.Durrant@xxxxxxxxxx>; Roger Pau Monne <roger.pau@xxxxxxxxxx>; Wei Liu
> <wei.liu2@xxxxxxxxxx>; Tim (Xen.org) <tim@xxxxxxx>
> Subject: [PATCH v2 3/3] x86/shadow: emulate_gva_to_mfn() should respect
> p2m_ioreq_server
> 
> Writes to such pages need to be handed to the emulator.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

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

> ---
> v2: Return BAD_GFN_TO_MFN instead.
> 
> --- a/xen/arch/x86/mm/shadow/hvm.c
> +++ b/xen/arch/x86/mm/shadow/hvm.c
> @@ -338,6 +338,11 @@ static mfn_t emulate_gva_to_mfn(struct v
>      {
>          return _mfn(BAD_GFN_TO_MFN);
>      }
> +    if ( p2mt == p2m_ioreq_server )
> +    {
> +        put_page(page);
> +        return _mfn(BAD_GFN_TO_MFN);
> +    }
>      if ( p2m_is_discard_write(p2mt) )
>      {
>          put_page(page);
> 


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