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

[Ilya Leoshkevich <iii@linux.ibm.com>]

On Thu, 2024-01-18 at 18:28 +0100, Thomas Huth wrote:
> 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
> 

Thanks, I'll append this to my TODO list. At least for CVB* there seems
to exist an unfinished patch on the list [1].

[1]
https://lore.kernel.org/qemu-devel/20180821025104.19604-8-pavel.zbitskiy@gmail.com/