linux-kernel - Re: [PATCH v2 03/13] powerpc/prom_init: Add the ESM call to prom

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Message-Id: <874l3i4zod.fsf@morokweng.localdomain>
Date:   Thu, 18 Jul 2019 21:48:34 -0300
From:   Thiago Jung Bauermann <bauerman@...ux.ibm.com>
To:     Alexey Kardashevskiy <aik@...abs.ru>
Cc:     Segher Boessenkool <segher@...nel.crashing.org>,
        linuxppc-dev@...ts.ozlabs.org,
        Anshuman Khandual <anshuman.linux@...il.com>,
        Mike Anderson <andmike@...ux.ibm.com>,
        Ram Pai <linuxram@...ibm.com>, linux-kernel@...r.kernel.org,
        Claudio Carvalho <cclaudio@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH v2 03/13] powerpc/prom_init: Add the ESM call to prom_init


Alexey Kardashevskiy <aik@...abs.ru> writes:

> On 19/07/2019 07:28, Thiago Jung Bauermann wrote:
>>
>> Hello Segher,
>>
>> Thanks for your review and suggestions!
>>
>> Segher Boessenkool <segher@...nel.crashing.org> writes:
>>
>>> (Sorry to hijack your reply).
>>>
>>> On Thu, Jul 18, 2019 at 06:11:48PM +1000, Alexey Kardashevskiy wrote:
>>>> On 13/07/2019 16:00, Thiago Jung Bauermann wrote:
>>>>> From: Ram Pai <linuxram@...ibm.com>
>>>>> +static int enter_secure_mode(unsigned long kbase, unsigned long fdt)
>>>>> +{
>>>>> +	register uint64_t func asm("r3") = UV_ESM;
>>>>> +	register uint64_t arg1 asm("r4") = (uint64_t)kbase;
>>>>> +	register uint64_t arg2 asm("r5") = (uint64_t)fdt;
>>>>
>>>> What does UV do with kbase and fdt precisely? Few words in the commit
>>>> log will do.
>
>
> What about this one? :)

Sorry, I don't have an elaborate answer yet. The non-elaborate answer is
that the ultravisor uses the kbase and fdt as part of integrity checking
of the secure guest.

--
Thiago Jung Bauermann
IBM Linux Technology Center