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    Subject[PATCH 4.4 32/37] x86/paravirt: Dont patch flush_tlb_single
    Date
    4.4-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Thomas Gleixner <tglx@linutronix.de>


    commit a035795499ca1c2bd1928808d1a156eda1420383 upstream

    native_flush_tlb_single() will be changed with the upcoming
    PAGE_TABLE_ISOLATION feature. This requires to have more code in
    there than INVLPG.

    Remove the paravirt patching for it.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Reviewed-by: Josh Poimboeuf <jpoimboe@redhat.com>
    Reviewed-by: Juergen Gross <jgross@suse.com>
    Acked-by: Peter Zijlstra <peterz@infradead.org>
    Cc: Andy Lutomirski <luto@kernel.org>
    Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: Borislav Petkov <bpetkov@suse.de>
    Cc: Brian Gerst <brgerst@gmail.com>
    Cc: Dave Hansen <dave.hansen@intel.com>
    Cc: Dave Hansen <dave.hansen@linux.intel.com>
    Cc: David Laight <David.Laight@aculab.com>
    Cc: Denys Vlasenko <dvlasenk@redhat.com>
    Cc: Eduardo Valentin <eduval@amazon.com>
    Cc: Greg KH <gregkh@linuxfoundation.org>
    Cc: H. Peter Anvin <hpa@zytor.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Will Deacon <will.deacon@arm.com>
    Cc: aliguori@amazon.com
    Cc: daniel.gruss@iaik.tugraz.at
    Cc: hughd@google.com
    Cc: keescook@google.com
    Cc: linux-mm@kvack.org
    Cc: michael.schwarz@iaik.tugraz.at
    Cc: moritz.lipp@iaik.tugraz.at
    Cc: richard.fellner@student.tugraz.at
    Link: https://lkml.kernel.org/r/20171204150606.828111617@linutronix.de
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    Acked-by: Borislav Petkov <bp@suse.de>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    arch/x86/kernel/paravirt_patch_64.c | 2 --
    1 file changed, 2 deletions(-)

    --- a/arch/x86/kernel/paravirt_patch_64.c
    +++ b/arch/x86/kernel/paravirt_patch_64.c
    @@ -9,7 +9,6 @@ DEF_NATIVE(pv_irq_ops, save_fl, "pushfq;
    DEF_NATIVE(pv_mmu_ops, read_cr2, "movq %cr2, %rax");
    DEF_NATIVE(pv_mmu_ops, read_cr3, "movq %cr3, %rax");
    DEF_NATIVE(pv_mmu_ops, write_cr3, "movq %rdi, %cr3");
    -DEF_NATIVE(pv_mmu_ops, flush_tlb_single, "invlpg (%rdi)");
    DEF_NATIVE(pv_cpu_ops, clts, "clts");
    DEF_NATIVE(pv_cpu_ops, wbinvd, "wbinvd");

    @@ -62,7 +61,6 @@ unsigned native_patch(u8 type, u16 clobb
    PATCH_SITE(pv_mmu_ops, read_cr3);
    PATCH_SITE(pv_mmu_ops, write_cr3);
    PATCH_SITE(pv_cpu_ops, clts);
    - PATCH_SITE(pv_mmu_ops, flush_tlb_single);
    PATCH_SITE(pv_cpu_ops, wbinvd);
    #if defined(CONFIG_PARAVIRT_SPINLOCKS) && defined(CONFIG_QUEUED_SPINLOCKS)
    case PARAVIRT_PATCH(pv_lock_ops.queued_spin_unlock):

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