[kvm-unit-tests,v5,0/6] s390x: Add support for running guests without MSO/MSL

Message

Nico Boehr July 12, 2023, 11:41 a.m. UTC

v5:
---
* fix a big oopsie in irq_set_dat_mode() which caused parts of lowcore being
  overwritten (thanks Claudio)

v4:
---
- add static assert for PSW bitfield (Janosch, Claudio)
- remove unneeded includes (Janosch)
- move variable decls to function start (Janosch)
- remove unneeded imports (Janosch)
- lowerocase hex (Janosch)
- remove unneeded attr (Janosch)
- tyop :-) fixes (Janosch)

v3:
---
* introduce bitfield for the PSW to make handling less clumsy
* some variable renames (Claudio)
* remove unneeded barriers (Claudio)
* remove rebase leftover sie_had_pgm_int (Claudio)
* move read_pgm_int_code to header (Claudio)
* squash include fix commit into the one causing the issue (Claudio)

v2:
---
* add function to change DAT/AS mode for all irq handlers (Janosch, Claudio)
* instead of a new flag in PROG0C, check the pgm int code in lowcore (Janosch)
* fix indents, comments (Nina)

Right now, all SIE tests in kvm-unit-tests (i.e. where kvm-unit-test is the
hypervisor) run using MSO/MSL.

This is convenient, because it's simple. But it also comes with
disadvantages, for example some features are unavailabe with MSO/MSL.

This series adds support for running guests without MSO/MSL with dedicated
guest page tables for the GPA->HPA translation.

Since SIE implicitly uses the primary space mode for the guest, the host
can't run in the primary space mode, too. To avoid moving all tests to the
home space mode, only switch to home space mode when it is actually needed.

This series also comes with various bugfixes that were caught while
develoing this.

Nico Boehr (6):
  lib: s390x: introduce bitfield for PSW mask
  s390x: add function to set DAT mode for all interrupts
  s390x: sie: switch to home space mode before entering SIE
  s390x: lib: don't forward PSW when handling exception in SIE
  s390x: lib: sie: don't reenter SIE on pgm int
  s390x: add a test for SIE without MSO/MSL

 lib/s390x/asm/arch_def.h   |  27 ++++++++-
 lib/s390x/asm/interrupt.h  |  18 ++++++
 lib/s390x/asm/mem.h        |   1 +
 lib/s390x/interrupt.c      |  37 ++++++++++++
 lib/s390x/mmu.c            |   5 +-
 lib/s390x/sie.c            |  22 ++++++-
 s390x/Makefile             |   2 +
 s390x/selftest.c           |  40 +++++++++++++
 s390x/sie-dat.c            | 115 +++++++++++++++++++++++++++++++++++++
 s390x/snippets/c/sie-dat.c |  58 +++++++++++++++++++
 s390x/unittests.cfg        |   3 +
 11 files changed, 324 insertions(+), 4 deletions(-)
 create mode 100644 s390x/sie-dat.c
 create mode 100644 s390x/snippets/c/sie-dat.c