Re: [Xen-devel] [v7][RFC][PATCH 06/13] hvmloader/ram: check if guest memory is out of reserved device memory maps

["Chen, Tiejun" <tiejun.chen@xxxxxxxxx>]

> 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


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