linux-kernel - [PATCH 0/1] Enhanced TLB flushing for vmap/vmalloc()

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Date:   Mon, 7 Aug 2023 16:23:04 +0800
From:   Dylan Jhong <dylan@...estech.com>
To:     <paul.walmsley@...ive.com>, <palmer@...belt.com>,
        <aou@...s.berkeley.edu>, <ajones@...tanamicro.com>,
        <alexghiti@...osinc.com>, <anup@...infault.org>, <rppt@...nel.org>,
        <samuel@...lland.org>, <panqinglin2020@...as.ac.cn>,
        <sergey.matyukevich@...tacore.com>, <maz@...nel.org>,
        <linux-riscv@...ts.infradead.org>, <conor.dooley@...rochip.com>,
        <linux-kernel@...r.kernel.org>
CC:     <ycliang@...estech.com>, <x5710999x@...il.com>,
        <tim609@...estech.com>, Dylan Jhong <dylan@...estech.com>
Subject: [PATCH 0/1] Enhanced TLB flushing for vmap/vmalloc()

This patch is actually the v2 version of the this patch[1]. In the v1 version,
Alexandre suggested that I should make the patch more general, so I even changed
the title accordingly. Many thanks to Alexandre.

And Alexandre also submitted a similar patch[2] recently, in which he implemented
TLB flushing via flush_cache_vmap() instead. However, it seems that flush_cache_vmap()
does not cover every place where arch_sync_kernel_mappings() performs TLB flushing.
IMHO, arch_sync_kernel_mappings() cannot be replaced by flush_cache_vmap().
Please correct me if I'm wrong!

[1]: [PATCH] riscv: Flush stale TLB entry with VMAP_STACK enabled
     http://lists.infradead.org/pipermail/linux-riscv/2023-August/037503.html

[2]: [PATCH -fixes] riscv: Implement flush_cache_vmap()
     https://www.spinics.net/lists/kernel/msg4873712.html

Dylan Jhong (1):
  riscv: Implement arch_sync_kernel_mappings() for "preventive" TLB
    flush

 arch/riscv/include/asm/page.h |  2 ++
 arch/riscv/mm/tlbflush.c      | 12 ++++++++++++
 2 files changed, 14 insertions(+)

-- 
2.34.1