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Re: [Qemu-devel] [PATCH 08/10] target-s390x: implement STFLE instruction

From: Richard Henderson
Subject: Re: [Qemu-devel] [PATCH 08/10] target-s390x: implement STFLE instruction
Date: Wed, 27 May 2015 07:31:01 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 05/26/2015 03:03 PM, Aurelien Jarno wrote:
> Ok, I understand now. That said I don't see how implementing STFLE will
> break that. I think it will actually improve things by enabling more
> facilities and thus making the kernel happier (but maybe not enough).

Somewhat amusingly, by not implementing STFLE we bypass this check.

>> #elif defined(CONFIG_MARCH_Z990)
>>         .long 1, 0xc0002000
> For this one we only miss one instruction in the LD facility. I have it
> on my TODO list, though it might take a few weeks until it goes to the
> top.

Which one?

>> #elif defined(CONFIG_MARCH_Z900)
>>         .long 1, 0xc0000000
> This corresponds to the current value we provide. CONFIG_MARCH_Z900 also
> correspond to the configuration of the Debian kernel, that's why I am
> able to boot kernels.

Ah, well that's something.  Fedora defaults to z9-109, and I think SuSE does
the same.


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