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x86/alternatives, x86/fpu: Add 'alternatives_patched' debug flag and use it in xsave_state()
We'd like to use xsave_state() earlier, but its SYSTEM_BOOTING check is too imprecise. The real condition that xsave_state() would like to check is whether alternative XSAVE instructions were patched into the kernel image already. Add such a (read-mostly) debug flag and use it in xsave_state(). 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>
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@ -52,6 +52,12 @@ struct alt_instr {
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u8 padlen; /* length of build-time padding */
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} __packed;
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/*
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* Debug flag that can be tested to see whether alternative
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* instructions were patched in already:
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*/
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extern int alternatives_patched;
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extern void alternative_instructions(void);
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extern void apply_alternatives(struct alt_instr *start, struct alt_instr *end);
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@ -119,7 +119,7 @@ static inline int xsave_state(struct xsave_struct *fx)
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u32 hmask = mask >> 32;
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int err = 0;
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WARN_ON(system_state == SYSTEM_BOOTING);
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WARN_ON(!alternatives_patched);
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/*
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* If xsaves is enabled, xsaves replaces xsaveopt because
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@ -21,6 +21,10 @@
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#include <asm/io.h>
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#include <asm/fixmap.h>
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int __read_mostly alternatives_patched;
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EXPORT_SYMBOL_GPL(alternatives_patched);
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#define MAX_PATCH_LEN (255-1)
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static int __initdata_or_module debug_alternative;
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@ -627,6 +631,7 @@ void __init alternative_instructions(void)
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apply_paravirt(__parainstructions, __parainstructions_end);
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restart_nmi();
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alternatives_patched = 1;
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}
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/**
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