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Re: [qemu-s390x] [PATCH 10/15] s390-bios: Support for running format-0/1

From: Jason J. Herne
Subject: Re: [qemu-s390x] [PATCH 10/15] s390-bios: Support for running format-0/1 channel programs
Date: Mon, 14 Jan 2019 13:44:12 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1

On 1/7/19 2:02 PM, Jason J. Herne wrote:
@@ -190,6 +247,9 @@ struct ciw {
      __u16 count;
+#define CU_TYPE_VIRTIO          0x3832
+#define CU_TYPE_DASD            0x3990

No other dasd types we want to support? :) (Not sure if others are out
in the wild. Maybe FBA?)

I have no idea. I assumed 3390 was the only thing we supported. Perhaps 3380? I'd need to find a test device, which I could probably do ... I'll look more into this.

After a few discussions with folks in the lab we've decided that we don't see a ton of value in supporting anything other than 3990 at the moment. Anything else would be older (3380) and/or rare to see in the wild (and very difficult to test). As for emulated setups like z/VM, a user can just use 3390 instead of FBA. So I recommend we move forward with 3390/3990 support for now. We can always add in others types if/when we need them.

-- Jason J. Herne (address@hidden)

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