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x86/fpu: Clean up xstate feature reservation

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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>
This commit is contained in:
Ingo Molnar 2015-05-04 09:04:56 +02:00
parent 39f1acd243
commit 489e9c0188
1 changed files with 10 additions and 5 deletions
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15
arch/x86/include/asm/fpu/types.h
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@ -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)));
/*