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This function is pointlessly global and a complete misnomer because it's usage is related to both supervisor state checks and compacted format checks. Remove it and just make the conditions check the XSAVES feature. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Borislav Petkov <bp@suse.de> Link: https://lkml.kernel.org/r/20210623121453.425493349@linutronix.de
122 lines
3.9 KiB
C
122 lines
3.9 KiB
C
/* 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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int xfeature_size(int xfeature_nr);
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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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enum xstate_copy_mode {
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XSTATE_COPY_FP,
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XSTATE_COPY_FX,
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XSTATE_COPY_XSAVE,
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};
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struct membuf;
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void copy_xstate_to_uabi_buf(struct membuf to, struct xregs_state *xsave,
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enum xstate_copy_mode mode);
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#endif
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