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[v3,00/11] target/i386: add a few simple features

Message ID 20230623131711.96775-1-pbonzini@redhat.com
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Series target/i386: add a few simple features | expand

Message

Paolo Bonzini June 23, 2023, 1:17 p.m. UTC 
In preparation for supporting named CPU models for user-mode emulation,
add a few TCG features that are actually already implemented, or that
are easy to implement.  The most important (and most relevant to user-mode
emulation) are RDSEED, RDPID, and for 32-bit processors SYSCALL as well.

Paolo

v1->v2:
- fix WBNOINVD vmexit
- correctly implement 32-bit SYSCALL and SYSENTER
- do not include linux-user/ from target/

v2->v3:
- do not accept RDSEED if CPUID bit absent
- also raise illegal opcode exception for SYSRET in 32-bit mode for Intel CPUs
- raise illegal opcode exception for SYSENTER/SYSEXIT in 64-bit mode for AMD CPUs
- Also try sched_getcpu() to return a sensible value for RDPID, since FreeBSD
  does write the CPUID to MSR_TSC_AUX.
- Fully implement SYSCALL/SYSRET for 32-bit processors, including system emulators

Paolo Bonzini (11):
  target/i386: fix INVD vmexit
  target/i386: TCG supports 3DNow! prefetch(w)
  target/i386: TCG supports RDSEED
  target/i386: do not accept RDSEED if CPUID bit absent
  target/i386: TCG supports XSAVEERPTR
  target/i386: TCG supports WBNOINVD
  target/i386: Intel only supports SYSCALL/SYSRET in long mode
  target/i386: AMD only supports SYSENTER/SYSEXIT in 32-bit mode
  target/i386: sysret and sysexit are privileged
  target/i386: implement RDPID in TCG
  target/i386: implement SYSCALL/SYSRET in 32-bit emulators

 bsd-user/i386/target_arch_cpu.h     |  4 +++
 linux-user/i386/cpu_loop.c          | 13 ++++---
 meson.build                         |  2 ++
 target/i386/cpu.c                   | 31 +++++++++++-----
 target/i386/helper.h                |  4 +--
 target/i386/tcg/misc_helper.c       | 21 +++++++----
 target/i386/tcg/seg_helper.c        |  7 ++--
 target/i386/tcg/sysemu/seg_helper.c |  7 ++--
 target/i386/tcg/translate.c         | 55 ++++++++++++++++++++++-------
 target/i386/tcg/user/seg_helper.c   |  2 --
 10 files changed, 105 insertions(+), 41 deletions(-)