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Re: [PATCH v2 4/9] pc-bios: s390x: Rename and use PSW_MASK_ZMODE constan
From: |
Janosch Frank |
Subject: |
Re: [PATCH v2 4/9] pc-bios: s390x: Rename and use PSW_MASK_ZMODE constant |
Date: |
Mon, 25 May 2020 14:03:08 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 |
On 5/21/20 7:47 AM, Thomas Huth wrote:
> On 21/05/2020 07.44, Thomas Huth wrote:
>> On 14/05/2020 14.37, Janosch Frank wrote:
>>> ZMODE has a lot of ambiguity with the ESAME architecture mode, but is
>>> actually 64 bit addressing.
>>>
>>> Signed-off-by: Janosch Frank <address@hidden>
>>> Reviewed-by: Pierre Morel <address@hidden>
>>> Reviewed-by: David Hildenbrand <address@hidden>
>>> ---
>>> pc-bios/s390-ccw/dasd-ipl.c | 3 +--
>>> pc-bios/s390-ccw/s390-arch.h | 2 +-
>>> 2 files changed, 2 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c
>>> index 0fc879bb8e..b932531e6f 100644
>>> --- a/pc-bios/s390-ccw/dasd-ipl.c
>>> +++ b/pc-bios/s390-ccw/dasd-ipl.c
>>> @@ -229,7 +229,6 @@ void dasd_ipl(SubChannelId schid, uint16_t cutype)
>>> run_ipl2(schid, cutype, ipl2_addr);
>>>
>>> /* Transfer control to the guest operating system */
>>> - pswl->mask |= PSW_MASK_EAMODE; /* Force z-mode */
>>> - pswl->addr |= PSW_MASK_BAMODE; /* ... */
>>> + pswl->mask |= PSW_MASK_64; /* Force 64 bit addressing */
>>
>> This is not only a rename (as announced in the subject), but also a
>> change in behavior since you now do not change pswl->addr anymore. So
>> this is even a bug fix? Could you please mention this in the patch
>> description, too?
>
> Ah, wait, pswl is of type PSWLegacy, and ->mask and ->addr are of type
> uint32_t here! So it seems wrong to use a 64-bit value for mask here,
> doesn't it?
Absolutely, how did that even compile?
I'm tempted to just make it a unsigned long ptr instead. The legacy PSW
struct doesn't seem to be used correctly anyway, the lowcore one is in
fact never used and this is the only other occurrence.
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[PATCH v2 9/9] pc-bios: s390x: Make u32 ptr check explicit, Janosch Frank, 2020/05/14
Re: [PATCH v2 0/9] pc-bios: s390x: Cleanup part 1, no-reply, 2020/05/14
Re: [PATCH v2 0/9] pc-bios: s390x: Cleanup part 1, Cornelia Huck, 2020/05/20