// SPDX-License-Identifier: GPL-2.0-only
/*
* xsave/xrstor support.
*
* Author: Suresh Siddha <suresh.b.siddha@intel.com>
*/
#include <linux/compat.h>
#include <linux/cpu.h>
#include <linux/mman.h>
#include <linux/pkeys.h>
#include <linux/seq_file.h>
#include <linux/proc_fs.h>
#include <asm/fpu/api.h>
#include <asm/fpu/internal.h>
#include <asm/fpu/signal.h>
#include <asm/fpu/regset.h>
#include <asm/fpu/xstate.h>
#include <asm/tlbflush.h>
#include <asm/cpufeature.h>
/*
* Although we spell it out in here, the Processor Trace
* xfeature is completely unused. We use other mechanisms
* to save/restore PT state in Linux.
*/
static const char *xfeature_names[] =
{
"x87 floating point registers" ,
"SSE registers" ,
"AVX registers" ,
"MPX bounds registers" ,
"MPX CSR" ,
"AVX-512 opmask" ,
"AVX-512 Hi256" ,
"AVX-512 ZMM_Hi256" ,
"Processor Trace (unused)" ,
"Protection Keys User registers",
"unknown xstate feature" ,
};
static short xsave_cpuid_features[] __initdata = {
X86_FEATURE_FPU,
X86_FEATURE_XMM,
X86_FEATURE_AVX,
X86_FEATURE_MPX,
X86_FEATURE_MPX,
X86_FEATURE_AVX512F,
X86_FEATURE_AVX512F,
X86_FEATURE_AVX512F,
X86_FEATURE_INTEL_PT,
X86_FEATURE_PKU,
};
/*
* This represents the full set of bits that should ever be set in a kernel
* XSAVE buffer, both supervisor and user xstates.
*/
u64 xfeatures_mask_all __read_mostly;
static unsigned int xstate_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};
static unsigned int xstate_sizes[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};
static unsigned int xstate_comp_offsets[XFEATURE_MAX] = { [ 0 ... XFEATURE_MAX - 1] = -1};
static unsigned int xstate_