linux-kernel - [PATCH v9 2/4] arm64: tlbflush: Introduce __flush_tlb_kernel

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Date:   Mon, 30 Apr 2018 13:11:32 +0530
From:   Chintan Pandya <cpandya@...eaurora.org>
To:     Will Deacon <will.deacon@....com>, Arnd Bergmann <arnd@...db.de>,
        Mark Rutland <mark.rutland@....com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Marc Zyngier <marc.zyngier@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Philip Elcan <pelcan@...eaurora.org>,
        James Morse <james.morse@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Toshi Kani <toshi.kani@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Joerg Roedel <joro@...tes.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arch@...r.kernel.org, Chintan Pandya <cpandya@...eaurora.org>
Subject: [PATCH v9 2/4] arm64: tlbflush: Introduce __flush_tlb_kernel_pgtable

Add an interface to invalidate intermediate page tables
from TLB for kernel.

Signed-off-by: Chintan Pandya <cpandya@...eaurora.org>
---
 arch/arm64/include/asm/tlbflush.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index dfc61d7..a4a1901 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -218,6 +218,13 @@ static inline void __flush_tlb_pgtable(struct mm_struct *mm,
 	dsb(ish);
 }
 
+static inline void __flush_tlb_kernel_pgtable(unsigned long kaddr)
+{
+	unsigned long addr = __TLBI_VADDR(kaddr, 0);
+
+	__tlbi(vaae1is, addr);
+	dsb(ish);
+}
 #endif
 
 #endif
-- 
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