linux-kernel - Re: [PATCH v10 06/17] Xen: ARM: Add support for mapping platform device mmio

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Date:	Thu, 7 Apr 2016 09:37:01 +0800
From:	Shannon Zhao <zhaoshenglong@...wei.com>
To:	Julien Grall <julien.grall@....com>,
	Shannon Zhao <shannon.zhao@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>, <sstabellini@...nel.org>
CC:	<david.vrabel@...rix.com>, <devicetree@...r.kernel.org>,
	<linux-efi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<peter.huangpeng@...wei.com>, <xen-devel@...ts.xen.org>
Subject: Re: [PATCH v10 06/17] Xen: ARM: Add support for mapping platform
 device mmio



On 2016/4/6 20:16, Julien Grall wrote:
>> +            gpfns[j] = XEN_PFN_DOWN(r->start) + j;
>> +            idxs[j] = XEN_PFN_DOWN(r->start) + j;
>> +        }
>> +
>> +        xatp.domid = DOMID_SELF;
>> +        xatp.size = nr;
>> +        xatp.space = XENMAPSPACE_dev_mmio;
>> +
>> +        set_xen_guest_handle(xatp.gpfns, gpfns);
>> +        set_xen_guest_handle(xatp.idxs, idxs);
>> +        set_xen_guest_handle(xatp.errs, errs);
>> +
>> +        rc = HYPERVISOR_memory_op(XENMEM_add_to_physmap_range, &xatp);
>> +        kfree(gpfns);
>> +        kfree(idxs);
>> +        kfree(errs);
>> +        if (rc)
>> +            return rc;
> 
> Shouldn't we redo the mapping if the hypercall fails?
Hmm, why? If it fails again when we redo the mapping, what should we do
then? Redo again?
I think if it fails at the first time it will always fail no matter how
many times we do.

Thanks,
-- 
Shannon