133 lines
4.3 KiB
C
133 lines
4.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_X86_XSAVE_H
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#define __ASM_X86_XSAVE_H
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#include <linux/uaccess.h>
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#include <linux/types.h>
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#include <asm/processor.h>
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#include <asm/fpu/api.h>
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#include <asm/user.h>
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/* Bit 63 of XCR0 is reserved for future expansion */
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#define XFEATURE_MASK_EXTEND (~(XFEATURE_MASK_FPSSE | (1ULL << 63)))
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#define XSTATE_CPUID 0x0000000d
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#define TILE_CPUID 0x0000001d
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#define FXSAVE_SIZE 512
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#define XSAVE_HDR_SIZE 64
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#define XSAVE_HDR_OFFSET FXSAVE_SIZE
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#define XSAVE_YMM_SIZE 256
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#define XSAVE_YMM_OFFSET (XSAVE_HDR_SIZE + XSAVE_HDR_OFFSET)
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#define XSAVE_ALIGNMENT 64
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/* All currently supported user features */
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#define XFEATURE_MASK_USER_SUPPORTED (XFEATURE_MASK_FP | \
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XFEATURE_MASK_SSE | \
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XFEATURE_MASK_YMM | \
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XFEATURE_MASK_OPMASK | \
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XFEATURE_MASK_ZMM_Hi256 | \
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XFEATURE_MASK_Hi16_ZMM | \
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XFEATURE_MASK_PKRU | \
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XFEATURE_MASK_BNDREGS | \
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XFEATURE_MASK_BNDCSR | \
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XFEATURE_MASK_XTILE)
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/*
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* Features which are restored when returning to user space.
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* PKRU is not restored on return to user space because PKRU
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* is switched eagerly in switch_to() and flush_thread()
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*/
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#define XFEATURE_MASK_USER_RESTORE \
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(XFEATURE_MASK_USER_SUPPORTED & ~XFEATURE_MASK_PKRU)
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/* Features which are dynamically enabled for a process on request */
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#define XFEATURE_MASK_USER_DYNAMIC XFEATURE_MASK_XTILE_DATA
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/* All currently supported supervisor features */
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#define XFEATURE_MASK_SUPERVISOR_SUPPORTED (XFEATURE_MASK_PASID)
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/*
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* A supervisor state component may not always contain valuable information,
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* and its size may be huge. Saving/restoring such supervisor state components
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* at each context switch can cause high CPU and space overhead, which should
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* be avoided. Such supervisor state components should only be saved/restored
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* on demand. The on-demand supervisor features are set in this mask.
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*
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* Unlike the existing supported supervisor features, an independent supervisor
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* feature does not allocate a buffer in task->fpu, and the corresponding
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* supervisor state component cannot be saved/restored at each context switch.
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*
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* To support an independent supervisor feature, a developer should follow the
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* dos and don'ts as below:
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* - Do dynamically allocate a buffer for the supervisor state component.
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* - Do manually invoke the XSAVES/XRSTORS instruction to save/restore the
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* state component to/from the buffer.
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* - Don't set the bit corresponding to the independent supervisor feature in
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* IA32_XSS at run time, since it has been set at boot time.
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*/
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#define XFEATURE_MASK_INDEPENDENT (XFEATURE_MASK_LBR)
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/*
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* Unsupported supervisor features. When a supervisor feature in this mask is
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* supported in the future, move it to the supported supervisor feature mask.
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*/
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#define XFEATURE_MASK_SUPERVISOR_UNSUPPORTED (XFEATURE_MASK_PT)
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/* All supervisor states including supported and unsupported states. */
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#define XFEATURE_MASK_SUPERVISOR_ALL (XFEATURE_MASK_SUPERVISOR_SUPPORTED | \
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XFEATURE_MASK_INDEPENDENT | \
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XFEATURE_MASK_SUPERVISOR_UNSUPPORTED)
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/*
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* The feature mask required to restore FPU state:
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* - All user states which are not eagerly switched in switch_to()/exec()
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* - The suporvisor states
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*/
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#define XFEATURE_MASK_FPSTATE (XFEATURE_MASK_USER_RESTORE | \
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XFEATURE_MASK_SUPERVISOR_SUPPORTED)
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/*
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* Features in this mask have space allocated in the signal frame, but may not
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* have that space initialized when the feature is in its init state.
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*/
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#define XFEATURE_MASK_SIGFRAME_INITOPT (XFEATURE_MASK_XTILE | \
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XFEATURE_MASK_USER_DYNAMIC)
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extern u64 xstate_fx_sw_bytes[USER_XSTATE_FX_SW_WORDS];
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extern void __init update_regset_xstate_info(unsigned int size,
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u64 xstate_mask);
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int xfeature_size(int xfeature_nr);
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void xsaves(struct xregs_state *xsave, u64 mask);
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void xrstors(struct xregs_state *xsave, u64 mask);
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int xfd_enable_feature(u64 xfd_err);
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#ifdef CONFIG_X86_64
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DECLARE_STATIC_KEY_FALSE(__fpu_state_size_dynamic);
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#endif
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#ifdef CONFIG_X86_64
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DECLARE_STATIC_KEY_FALSE(__fpu_state_size_dynamic);
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static __always_inline __pure bool fpu_state_size_dynamic(void)
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{
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return static_branch_unlikely(&__fpu_state_size_dynamic);
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}
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#else
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static __always_inline __pure bool fpu_state_size_dynamic(void)
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{
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return false;
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}
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#endif
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#endif
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