Sync/apx 20260806 - #588
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Add test suite for Intel APX (Advanced Performance Extensions) covering:
CPUID enumeration (4 tests):
- Feature bit, XSAVE/OSXSAVE, XCR0[19], XSAVE area size/offset
XSAVE state component 19 (5 tests):
- State size/offset validation, signal/fork/context-switch preservation
Direct EGPR access (3 tests):
- Individual R16-R31 read/write, simultaneous 16-register load, syscall
APX instruction encodings (13 tests):
- NDD (add/sub/and/or/xor/shl/shr), NF (add/sub/inc/dec),
CFCMOV, PUSH2/POP2
Signed-off-by: Xudong Hao <xudong.hao@intel.com>
(cherry picked from commit 305e4e4)
… tests
These tests exercise __copy_xstate_to_uabi_buf() and
copy_uabi_to_xstate() kernel paths modified by the APX commit series.
apx_ptrace (3 tests):
- ptrace_get: PTRACE_GETREGSET reads EGPR via NT_X86_XSTATE
- ptrace_inject: SETREGSET + GETREGSET roundtrip verification
- ptrace_modify: Individual EGPR value injection and readback
apx_sigcontext (5 tests):
- sigctx_magic: FP_XSTATE_MAGIC1/MAGIC2 presence in signal frame
- sigctx_xfeatures: fpx_sw_bytes.xfeatures includes APX bit
- sigctx_xstatebv: XSTATE_BV in XSAVE header includes APX bit
- sigctx_delivery: EGPR data correctly delivered in signal frame
- sigctx_restore: Modified EGPRs in handler persist after sigreturn
apx_ctxsw (1 test):
- ctxsw_threads: 5-thread mutex-handoff on single CPU with
randomized EGPR values, verifying state survives context switches
Signed-off-by: Xudong Hao <xudong.hao@intel.com>
(cherry picked from commit 6b79554)
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