Merge tag 'pull-lu-20240526' of https://gitlab.com/rth7680/qemu into staging

target/i386: Introduce X86Access and use for xsave and friends
linux-user/i386: Fix allocation and alignment of fp state in signal frame

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# gpg: Good signature from "Richard Henderson <richard.henderson@linaro.org>" [ultimate]

* tag 'pull-lu-20240526' of https://gitlab.com/rth7680/qemu: (28 commits)
  target/i386: Pass host pointer and size to cpu_x86_{xsave,xrstor}
  target/i386: Pass host pointer and size to cpu_x86_{fxsave,fxrstor}
  target/i386: Pass host pointer and size to cpu_x86_{fsave,frstor}
  target/i386: Convert do_xrstor to X86Access
  target/i386: Convert do_xsave to X86Access
  linux-user/i386: Honor xfeatures in xrstor_sigcontext
  linux-user/i386: Fix allocation and alignment of fp state
  linux-user/i386: Return boolean success from xrstor_sigcontext
  linux-user/i386: Return boolean success from restore_sigcontext
  linux-user/i386: Fix -mregparm=3 for signal delivery
  linux-user/i386: Split out struct target_fregs_state
  linux-user/i386: Replace target_fpstate_fxsave with X86LegacyXSaveArea
  linux-user/i386: Remove xfeatures from target_fpstate_fxsave
  linux-user/i386: Drop xfeatures_size from sigcontext arithmetic
  target/i386: Add {hw,sw}_reserved to X86LegacyXSaveArea
  target/i386: Add rbfm argument to cpu_x86_{xsave,xrstor}
  target/i386: Split out do_xsave_chk
  target/i386: Convert do_xrstor_* to X86Access
  target/i386: Convert do_xsave_* to X86Access
  tagret/i386: Convert do_fxsave, do_fxrstor to X86Access
  ...

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>