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Re: [PATCH v6 18/18] pc-bios: s390x: Save iplb location in lowcore

From: David Hildenbrand
Subject: Re: [PATCH v6 18/18] pc-bios: s390x: Save iplb location in lowcore
Date: Wed, 4 Mar 2020 14:37:26 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0

On 04.03.20 14:25, Christian Borntraeger wrote:
> On 04.03.20 12:42, Janosch Frank wrote:
>> The POP states that for a list directed IPL the IPLB is stored into
>> memory by the machine loader and its address is stored at offset 0x14
>> of the lowcore.
>> ZIPL currently uses the address in offset 0x14 to access the IPLB and
>> acquire flags about secure boot. If the IPLB address points into
>> memory which has an unsupported mix of flags set, ZIPL will panic
>> instead of booting the OS.
>> As the lowcore can have quite a high entropy for a guest that did drop
>> out of protected mode (i.e. rebooted) we encountered the ZIPL panic
>> quite often.
>> Signed-off-by: Janosch Frank <address@hidden>
>> Tested-by: Marc Hartmayer <address@hidden>
> I think this makes sense even without protected virtualization, no?
> Unless somebody complains, I think I will pick this up while Conny is
> on vacation.

Yes, makes sense!


David / dhildenb

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