linux-kernel - [PATCH] RISC-V: mm: Support huge page in vmalloc

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Date:   Fri, 24 Feb 2023 18:40:01 +0800
From:   Dylan Jhong <dylan@...estech.com>
To:     <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
CC:     <liushixin2@...wei.com>, <x5710999x@...il.com>,
        <bjorn@...osinc.com>, <abrestic@...osinc.com>, <peterx@...hat.com>,
        <hanchuanhua@...o.com>, <apopple@...dia.com>, <hca@...ux.ibm.com>,
        <aou@...s.berkeley.edu>, <palmer@...belt.com>,
        <paul.walmsley@...ive.com>, <tim609@...estech.com>,
        <peterlin@...estech.com>, <ycliang@...estech.com>,
        Dylan Jhong <dylan@...estech.com>
Subject: [PATCH] RISC-V: mm: Support huge page in vmalloc_fault()

RISC-V supports ioremap() with huge page (pud/pmd) mapping, but
vmalloc_fault() assumes that the vmalloc range is limited to pte
mappings. Add huge page support to complete the vmalloc_fault()
function.

Fixes: 310f541a027b ("riscv: Enable HAVE_ARCH_HUGE_VMAP for 64BIT")

Signed-off-by: Dylan Jhong <dylan@...estech.com>
---
 arch/riscv/mm/fault.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/mm/fault.c b/arch/riscv/mm/fault.c
index eb0774d9c03b..4b9953b47d81 100644
--- a/arch/riscv/mm/fault.c
+++ b/arch/riscv/mm/fault.c
@@ -143,6 +143,8 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a
 		no_context(regs, addr);
 		return;
 	}
+	if (pud_leaf(*pud_k))
+		goto flush_tlb;
 
 	/*
 	 * Since the vmalloc area is global, it is unnecessary
@@ -153,6 +155,8 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a
 		no_context(regs, addr);
 		return;
 	}
+	if (pmd_leaf(*pmd_k))
+		goto flush_tlb;
 
 	/*
 	 * Make sure the actual PTE exists as well to
@@ -172,6 +176,7 @@ static inline void vmalloc_fault(struct pt_regs *regs, int code, unsigned long a
 	 * ordering constraint, not a cache flush; it is
 	 * necessary even after writing invalid entries.
 	 */
+flush_tlb:
 	local_flush_tlb_page(addr);
 }
 
-- 
2.34.1