Re: [Xen-devel] [PATCH V4] tools/libxc, xen/x86: Added xc_set_mem_access_multi()

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Sep 15, 2016 at 04:52:32PM +0300, Razvan Cojocaru wrote:
> On 09/15/2016 04:49 PM, Wei Liu wrote:
> > On Thu, Sep 15, 2016 at 04:39:47PM +0300, Razvan Cojocaru wrote:
> >> On 09/07/2016 07:01 PM, Jan Beulich wrote:
> >>>>>> On 07.09.16 at 11:12, <rcojocaru@xxxxxxxxxxxxxxx> wrote:
> >>>> Currently it is only possible to set mem_access restrictions only for
> >>>> a contiguous range of GFNs (or, as a particular case, for a single GFN).
> >>>> This patch introduces a new libxc function taking an array of GFNs.
> >>>> The alternative would be to set each page in turn, using a userspace-HV
> >>>> roundtrip for each call, and triggering a TLB flush per page set.
> >>>>
> >>>> Signed-off-by: Razvan Cojocaru <rcojocaru@xxxxxxxxxxxxxxx>
> >>>> Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
> >>>
> >>> Hypervisor parts (without ARM and x86/mm)
> >>> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> >>>
> >>> albeit I spotted one more cosmetic issue (which I guess could be
> >>> fixed up during commit, if no other reason for a v5 arises):
> >>>
> >>>> @@ -321,9 +322,22 @@ int compat_memory_op(unsigned int cmd, 
> >>>> XEN_GUEST_HANDLE_PARAM(void) compat)
> >>>>          }
> >>>>  
> >>>>          case XENMEM_access_op:
> >>>> -            return mem_access_memop(cmd,
> >>>> -                                    guest_handle_cast(compat,
> >>>> -                                                      
> >>>> xen_mem_access_op_t));
> >>>> +        {
> >>>> +            if ( copy_from_guest(&cmp.mao, compat, 1) )
> >>>> +                return -EFAULT;
> >>>> +
> >>>> +#define XLAT_mem_access_op_HNDL_pfn_list(_d_, _s_) \
> >>>> +            guest_from_compat_handle((_d_)->pfn_list, (_s_)->pfn_list)
> >>>> +#define XLAT_mem_access_op_HNDL_access_list(_d_, _s_) \
> >>>> +            guest_from_compat_handle((_d_)->access_list, 
> >>>> (_s_)->access_list)
> >>>> +
> >>>> +            XLAT_mem_access_op(nat.mao, &cmp.mao);
> >>>> +
> >>>> +#undef XLAT_mem_access_op_HNDL_pfn_list
> >>>> +#undef XLAT_mem_access_op_HNDL_access_list
> >>>> +
> >>>> +            break;
> >>>> +        }
> >>>
> >>> There are no local variables declared here, so I don't see the need
> >>> for the braces.
> >>
> >> There have only been Acked-by replies so far, but if you'd prefer I have
> >> no problem sending a V5 removing the braces.
> >>
> > 
> > Does this patch have all the necessary acks? If so I don't mind fixing
> > it up and committing it.
> 
> In addition to your ack, it's:
> 
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
> Acked-by: Tamas K Lengyel <tamas@xxxxxxxxxxxxx>
> Acked-by: Julien Grall <julien.grall@xxxxxxx>
> 
> for the hypervisor parts (without ARM and x86/mm), vm_event and ARM
> respectively.
> 

I think it still needs an ack from George for x86/mm changes.

Wei.

> 
> Thanks,
> Razvan

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