From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Chen, Tiejun" <tiejun.chen@intel.com>
Subject: Re: [v7][RFC][PATCH 06/13] hvmloader/ram: check if
 guest memory is out of reserved device memory maps
Date: Thu, 20 Nov 2014 18:28:05 +0800
Message-ID: <546DC235.4020908@intel.com>
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> Have a second struct acpi_rmrr_unit pointer, starting out as NULL
> and getting set to the current one when the callback returns a
> positive value. Skip further iterations as long as both pointers
> match.

Great!

int intel_iommu_get_reserved_device_memory(iommu_grdm_t *func, void *ctxt)
{
     struct acpi_rmrr_unit *rmrr, *rmrr_cur = NULL;
     int rc = 0;
     unsigned int i;
     u16 bdf;

     for_each_rmrr_device ( rmrr, bdf, i )
     {
         if ( rmrr != rmrr_cur )
         {
             rc = func(PFN_DOWN(rmrr->base_address),
                       PFN_UP(rmrr->end_address) -
                         PFN_DOWN(rmrr->base_address),
                       PCI_SBDF(rmrr->segment, bdf),
                       ctxt);

             if ( unlikely(rc < 0) )
                 return rc;
             /* Hit this entry so just go next. */
             if ( rc > 0 )
                 rmrr_cur = rmrr;
         }
     }

     return 0;
}


Thanks
Tiejun