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* [Qemu-devel] [PATCH v1 0/3] target/s390x: implement MVCOS and allow to enable it
@ 2017-06-13 21:47 David Hildenbrand
  2017-06-13 21:47 ` [Qemu-devel] [PATCH v1 1/3] target/s390x: change PSW_SHIFT_KEY David Hildenbrand
                   ` (3 more replies)
  0 siblings, 4 replies; 17+ messages in thread
From: David Hildenbrand @ 2017-06-13 21:47 UTC (permalink / raw)
  To: qemu-devel; +Cc: rth, agraf, Aurelien Jarno, thuth, david, Miroslav Benes

This will not change the qemu model, we simply allow to enable the facility
for the qemu model.

A current upstream kernel (compiled for e.g. z900) can be tricked into
using MVCOS for uaccess by simply enabling the facility. This will work
even though the kernel is not compiled with z10+ support, as this
facility is also detected and used dynamically.

qemu-system-s390x ... -cpu qemu,mvcos=on ...

This might not be the fastest implementation, but it seems to work and
that is what we care about for now.

Requires my PGM fix series:
https://lists.nongnu.org/archive/html/qemu-devel/2017-06/msg02631.html

Based on an original patch by Miroslav Benes


David Hildenbrand (3):
  target/s390x: change PSW_SHIFT_KEY
  target/s390x: implement mvcos instruction
  s390x/cpumodel: allow to enable MVCOS for qemu cpu model

 target/s390x/cpu.h         |  21 ++++++++-
 target/s390x/cpu_models.c  |   1 +
 target/s390x/helper.c      |   4 +-
 target/s390x/helper.h      |   1 +
 target/s390x/insn-data.def |   2 +
 target/s390x/mem_helper.c  | 107 +++++++++++++++++++++++++++++++++++++++++++++
 target/s390x/translate.c   |  12 ++++-
 7 files changed, 143 insertions(+), 5 deletions(-)

-- 
2.9.3

^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2017-06-14 23:44 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2017-06-13 21:47 [Qemu-devel] [PATCH v1 0/3] target/s390x: implement MVCOS and allow to enable it David Hildenbrand
2017-06-13 21:47 ` [Qemu-devel] [PATCH v1 1/3] target/s390x: change PSW_SHIFT_KEY David Hildenbrand
2017-06-14  7:05   ` Thomas Huth
2017-06-13 21:47 ` [Qemu-devel] [PATCH v1 2/3] target/s390x: implement mvcos instruction David Hildenbrand
2017-06-14  4:41   ` Richard Henderson
2017-06-14  7:22     ` David Hildenbrand
2017-06-14 14:30       ` Richard Henderson
2017-06-14 17:02         ` David Hildenbrand
2017-06-14  7:37   ` Thomas Huth
2017-06-14  7:56     ` David Hildenbrand
2017-06-14 20:00       ` Thomas Huth
2017-06-14 23:44         ` Richard Henderson
2017-06-13 21:47 ` [Qemu-devel] [PATCH v1 3/3] s390x/cpumodel: allow to enable MVCOS for qemu cpu model David Hildenbrand
2017-06-14  4:44   ` Richard Henderson
2017-06-14  7:03     ` David Hildenbrand
2017-06-14  7:40       ` Thomas Huth
2017-06-13 21:57 ` [Qemu-devel] [PATCH v1 0/3] target/s390x: implement MVCOS and allow to enable it no-reply

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