x86/fpu: Clean up xstate feature reservation (489e9c01) · Commits · 戴 / test

Put MPX support into its separate high level structure, and also replace the fixed YMM, LWP and MPX structures in xregs_state with just reservations - their exact offsets in the structure will depend on the CPU and no code actually relies on those fields. No change in functionality. Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by:

Ingo Molnar <mingo@kernel.org>

arch/x86/include/asm/fpu/types.h

+10 −5

Original line number	Diff line number	Diff line
		@@ -145,12 +145,21 @@ struct bndcsr {
		u64 bndstatus;
		} __packed;

		struct mpx_struct {
		struct bndreg bndreg[4];
		struct bndcsr bndcsr;
		};

		struct xstate_header {
		u64 xfeatures;
		u64 xcomp_bv;
		u64 reserved[6];
		} __attribute__((packed));

		/* New processor state extensions should be added here: */
		#define XSTATE_RESERVE (sizeof(struct ymmh_struct) + \
		sizeof(struct lwp_struct) + \
		sizeof(struct mpx_struct) )
		/*
		* This is our most modern FPU state format, as saved by the XSAVE
		* and restored by the XRSTOR instructions.
		@@ -162,11 +171,7 @@ struct xstate_header {
		struct xregs_state {
		struct fxregs_state i387;
		struct xstate_header header;
		struct ymmh_struct ymmh;
		struct lwp_struct lwp;
		struct bndreg bndreg[4];
		struct bndcsr bndcsr;
		/* New processor state extensions will go here. */
		u8 __reserved[XSTATE_RESERVE];
		} __attribute__ ((packed, aligned (64)));

		/*

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