Hello Janosch!
On 04.01.2019 11:15, Janosch Frank wrote:
On 04.01.19 09:56, Jens Remus wrote:
Hi Janosch,
happy new year!
Thanks, same to you.
On 03.01.2019 11:07, Janosch Frank wrote:
LPAR and z/VM start in esam mode depending on the hardware, so we need
Did you consider the CZAM facility? You already use a so called "short
PSW" (which is compatible to the ESA/390 PSW, as you did not set bit 31).
LPAR and z/VM start in esam or esame mode, depending on the hardware
CZAM facility and z/VM MACHINE setting.
See POP section "Load State":
"When neither the configuration-z/Architecture-architectural-mode (CZAM)
facility nor the ESA/390-compatibility-mode facility are installed, this
sets the architectural mode to the ESA/390 mode. When the
ESA/390-compatibility-mode facility is installed, this sets the
architecture mode to the ESA/390-compatibility mode. When the CZAM
facility is installed, the architectural mode is unchanged (that is, it
remains in the z/Architecture architectural mode)."
to switch to z/Arch and set 64 bit addressing.
I don't really want to test in which state I am and blindly setting
z/Arch and 64 bit is a valid course of action according to the AR.
I completely agree with you. I was rather thinking of enhancing the
commit message to make clear that LPAR and z/VM start either in esam or
esame mode, depending on the hardware CZAM facility and z/VM MACHINE
setting. Re-reading your commit message I must admit that it kind of
already contains this with "depending on the hardware" and one may then
deduct from the commit subject that it must be z/Arch (esame) otherwise.
Wouldn't it be nice to mention this in the commit subject:
s390x: Switch to z/Arch and 64-bit addressing [mode]
As commented yesterday (Message-ID:
<9644d7ab-d815-720d-f1a1-eee1a6a0c253@xxxxxxxxxxxxx>):
The title will be changed to:
s390x: Switch to z/Arch and enable 64 bit addressing mode
Also I will move the sam64 from the previous patch into this one.
I might add to the comment that we do this no matter what configuration
we start out in, because it doesn't produce an exception.
That would be nice. Thanks!
Regards,
Jens
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