change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/x86/include/asm/fpu/xstate.h
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@@ -2,9 +2,11 @@
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 #ifndef __ASM_X86_XSAVE_H
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 #define __ASM_X86_XSAVE_H
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-#include <linux/types.h>
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-#include <asm/processor.h>
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 #include <linux/uaccess.h>
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+#include <linux/types.h>
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+
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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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@@ -19,19 +21,53 @@
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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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-/* Supervisor features */
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-#define XFEATURE_MASK_SUPERVISOR (XFEATURE_MASK_PT)
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+#define XSAVE_ALIGNMENT     64
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-/* All currently supported features */
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-#define XCNTXT_MASK		(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 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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+
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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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+/*
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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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+/*
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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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+
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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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@@ -39,22 +75,45 @@
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 #define REX_PREFIX
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 #endif
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-extern u64 xfeatures_mask;
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+extern u64 xfeatures_mask_all;
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+
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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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+
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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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+
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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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+
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+	return XFEATURE_MASK_DYNAMIC;
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+}
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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 fpu__xstate_clear_all_cpu_caps(void);
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-void *get_xsave_addr(struct xregs_state *xsave, int xstate);
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-const void *get_xsave_field_ptr(int xstate_field);
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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 copy_xstate_to_kernel(void *kbuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
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-int copy_xstate_to_user(void __user *ubuf, struct xregs_state *xsave, unsigned int offset, unsigned int size);
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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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+
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 /* Validate an xstate header supplied by userspace (ptrace or sigreturn) */
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-extern int validate_xstate_header(const struct xstate_header *hdr);
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+int validate_user_xstate_header(const struct xstate_header *hdr);
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 #endif