Re: [PATCH 0/2] target/s390x: Emulate CVDG

[Thomas Huth <thuth@redhat.com>]

On 15/01/2024 21.21, Ilya Leoshkevich wrote:
> Hi,
> 
> Ido reported that we are missing the CVDG emulation (which is very
> similar to the existing CVD emulation). This series adds it along with
> a test.

Just FYI, your patch made me curious which other instructions we still might 
be missing from chapter 7 in the Principles of Operation... with some shell 
scripting and manual fiddling, I ended up with this list:

0C	BRANCH AND SAVE AND SET MODE		BASSM
0B	BRANCH AND SET MODE			BSM
B21A	COMPARE AND FORM CODEWORD		CFC
B257	COMPARE UNTIL SUBSTRING EQUAL		CUSE
B263	COMPRESSION CALL			CMPSC
4F	CONVERT TO BINARY (32)			CVB
E306	CONVERT TO BINARY (32)			CVBY
E30E	CONVERT TO BINARY (64)			CVBG
B24D	COPY ACCESS				CPYA
EF	LOAD MULTIPLE DISJOINT			LMD
EE	PERFORM LOCKED OPERATION		PLO
B9BF	TRANSLATE AND TEST EXTENDED		TRTE
B9BD	TRANSLATE AND TEST REVERSE EXTENDED	TRTRE
0102	UPDATE TREE				UPT

There are some additional ones from the "Guarded-Storage Facility" and the 
"Transactional-Execution Facility", but these are optional AFAIK.

Some of these (like UPT) really look like sins from the CISC past, I guess 
we'll never need them for running Linux guests :-)

  Thomas