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* [PATCH v2 0/2] target/arm: Implement ID_AA64PFR2_EL1
@ 2025-09-23 17:57 Peter Maydell
  2025-09-23 17:57 ` [PATCH v2 1/2] target/arm: Move ID register field defs to cpu-features.h Peter Maydell
                   ` (2 more replies)
  0 siblings, 3 replies; 6+ messages in thread
From: Peter Maydell @ 2025-09-23 17:57 UTC (permalink / raw)
  To: qemu-arm, qemu-devel

The ID register ID_AA64PFR2_EL1 is in the space previously reserved
in the system register ID space, but recent versions of the
architecture have started to define fields in it to advertise the
presence of new architectural features. We don't implement any
of those new features yet, but will need to do so at some point.
(Notably, the GICv5 EAC spec defines a field in this register
to advertise the GICv5 CPU interface.)

This patchset gives ID_AA64PFR2_EL1 a backing field in the CPU
ID regs struct, defines the field names, and reads it from KVM if
it's present there. The only visible behaviour change is the
name we present to the user via the gdbstub.

Commit 1 is a code movement one to clear some more stuff out
of cpu.h that doesn't need to be there; it's mostly because of that
that I'm sending this patchset rather than holding on to it until
I have some GICv5 patches ready to send.

(Compare commit f7ddd7b6a1f90c from last year which added the
ID_AA64MMFR3_EL1 register.)

v2 here is just a rebase which updates the patchset to handle
the new array-based storage we're using for ID register values.

thanks
-- PMM

Peter Maydell (2):
  target/arm: Move ID register field defs to cpu-features.h
  target/arm: Implement ID_AA64PFR2_EL1

 linux-user/arm/target_proc.h |   2 +
 target/arm/cpu-features.h    | 415 +++++++++++++++++++++++++++++++++++
 target/arm/cpu.h             | 410 ----------------------------------
 target/arm/cpu-sysregs.h.inc |   1 +
 target/arm/helper.c          |   6 +-
 target/arm/hvf/hvf.c         |   2 +
 target/arm/kvm.c             |   1 +
 7 files changed, 425 insertions(+), 412 deletions(-)

-- 
2.43.0



^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2025-09-24  4:09 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-09-23 17:57 [PATCH v2 0/2] target/arm: Implement ID_AA64PFR2_EL1 Peter Maydell
2025-09-23 17:57 ` [PATCH v2 1/2] target/arm: Move ID register field defs to cpu-features.h Peter Maydell
2025-09-24  4:05   ` Philippe Mathieu-Daudé
2025-09-23 17:57 ` [PATCH v2 2/2] target/arm: Implement ID_AA64PFR2_EL1 Peter Maydell
2025-09-24  4:08   ` Philippe Mathieu-Daudé
2025-09-23 20:08 ` [PATCH v2 0/2] " Richard Henderson

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