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authorAndy Lutomirski <luto@kernel.org>2016-11-01 01:18:49 +0300
committerIngo Molnar <mingo@kernel.org>2016-11-01 09:47:55 +0300
commitaf25ed59b5616b389d90877f7085dc5d457a3d49 (patch)
treeaef06c59b5b02eae1d6250bb4ad34466bf1615b5 /arch/x86/lguest
parent0d50612c041f213fb6b98e3ff06e306a859c36f2 (diff)
downloadlinux-af25ed59b5616b389d90877f7085dc5d457a3d49.tar.xz
x86/fpu: Remove clts()
The kernel doesn't use clts() any more. Remove it and all of its paravirt infrastructure. A careful reader may notice that xen_clts() appears to have been buggy -- it didn't update xen_cr0_value. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Rik van Riel <riel@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kvm list <kvm@vger.kernel.org> Link: http://lkml.kernel.org/r/3d3c8ca62f17579b9849a013d71e59a4d5d1b079.1477951965.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/lguest')
-rw-r--r--arch/x86/lguest/boot.c12
1 files changed, 0 insertions, 12 deletions
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index d74afcdbc580..4ca0d78adcf0 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -518,17 +518,6 @@ static unsigned long lguest_read_cr0(void)
}
/*
- * Intel provided a special instruction to clear the TS bit for people too cool
- * to use write_cr0() to do it. This "clts" instruction is faster, because all
- * the vowels have been optimized out.
- */
-static void lguest_clts(void)
-{
- lazy_hcall1(LHCALL_TS, 0);
- current_cr0 &= ~X86_CR0_TS;
-}
-
-/*
* cr2 is the virtual address of the last page fault, which the Guest only ever
* reads. The Host kindly writes this into our "struct lguest_data", so we
* just read it out of there.
@@ -1429,7 +1418,6 @@ __init void lguest_init(void)
pv_cpu_ops.load_tls = lguest_load_tls;
pv_cpu_ops.get_debugreg = lguest_get_debugreg;
pv_cpu_ops.set_debugreg = lguest_set_debugreg;
- pv_cpu_ops.clts = lguest_clts;
pv_cpu_ops.read_cr0 = lguest_read_cr0;
pv_cpu_ops.write_cr0 = lguest_write_cr0;
pv_cpu_ops.read_cr4 = lguest_read_cr4;