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119 lines
4.0 KiB
119 lines
4.0 KiB
/* 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/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 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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/* 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 dynamic supervisor features are set in this mask. |
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* |
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* Unlike the existing supported supervisor features, a dynamic 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 a dynamic 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 dynamic 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_DYNAMIC (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_DYNAMIC | \ |
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XFEATURE_MASK_SUPERVISOR_UNSUPPORTED) |
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#ifdef CONFIG_X86_64 |
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#define REX_PREFIX "0x48, " |
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#else |
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#define REX_PREFIX |
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#endif |
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extern u64 xfeatures_mask_all; |
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static inline u64 xfeatures_mask_supervisor(void) |
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{ |
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return xfeatures_mask_all & XFEATURE_MASK_SUPERVISOR_SUPPORTED; |
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} |
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static inline u64 xfeatures_mask_user(void) |
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{ |
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return xfeatures_mask_all & XFEATURE_MASK_USER_SUPPORTED; |
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} |
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static inline u64 xfeatures_mask_dynamic(void) |
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{ |
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if (!boot_cpu_has(X86_FEATURE_ARCH_LBR)) |
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return XFEATURE_MASK_DYNAMIC & ~XFEATURE_MASK_LBR; |
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return XFEATURE_MASK_DYNAMIC; |
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} |
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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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void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr); |
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const void *get_xsave_field_ptr(int xfeature_nr); |
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int using_compacted_format(void); |
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int xfeature_size(int xfeature_nr); |
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struct membuf; |
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void copy_xstate_to_kernel(struct membuf to, struct xregs_state *xsave); |
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int copy_kernel_to_xstate(struct xregs_state *xsave, const void *kbuf); |
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int copy_user_to_xstate(struct xregs_state *xsave, const void __user *ubuf); |
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void copy_supervisor_to_kernel(struct xregs_state *xsave); |
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void copy_dynamic_supervisor_to_kernel(struct xregs_state *xstate, u64 mask); |
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void copy_kernel_to_dynamic_supervisor(struct xregs_state *xstate, u64 mask); |
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/* Validate an xstate header supplied by userspace (ptrace or sigreturn) */ |
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int validate_user_xstate_header(const struct xstate_header *hdr); |
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#endif
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