linux-kernel - [PATCH v2 08/12] riscv: extend execmem

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Message-Id: <20230616085038.4121892-9-rppt@kernel.org>
Date:   Fri, 16 Jun 2023 11:50:34 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        "David S. Miller" <davem@...emloft.net>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Helge Deller <deller@....de>,
        Huacai Chen <chenhuacai@...nel.org>,
        Kent Overstreet <kent.overstreet@...ux.dev>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Mike Rapoport <rppt@...nel.org>,
        Nadav Amit <nadav.amit@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Puranjay Mohan <puranjay12@...il.com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>,
        Russell King <linux@...linux.org.uk>,
        Song Liu <song@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, bpf@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org, linux-modules@...r.kernel.org,
        linux-parisc@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, loongarch@...ts.linux.dev,
        netdev@...r.kernel.org, sparclinux@...r.kernel.org, x86@...nel.org
Subject: [PATCH v2 08/12] riscv: extend execmem_params for kprobes allocations

From: "Mike Rapoport (IBM)" <rppt@...nel.org>

RISC-V overrides kprobes::alloc_insn_range() to use the entire vmalloc area
rather than limit the allocations to the modules area.

Slightly reorder execmem_params initialization to support both 32 and 64
bit variantsi and add definition of jit area to execmem_params to support
generic kprobes::alloc_insn_page().

Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
---
 arch/riscv/kernel/module.c         | 16 +++++++++++++++-
 arch/riscv/kernel/probes/kprobes.c | 10 ----------
 2 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/arch/riscv/kernel/module.c b/arch/riscv/kernel/module.c
index ee5e04cd3f21..cca6ed4e9340 100644
--- a/arch/riscv/kernel/module.c
+++ b/arch/riscv/kernel/module.c
@@ -436,7 +436,7 @@ int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
 	return 0;
 }
 
-#if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
+#ifdef CONFIG_MMU
 static struct execmem_params execmem_params = {
 	.modules = {
 		.text = {
@@ -444,12 +444,26 @@ static struct execmem_params execmem_params = {
 			.alignment = 1,
 		},
 	},
+	.jit = {
+		.text = {
+			.pgprot = PAGE_KERNEL_READ_EXEC,
+			.alignment = 1,
+		},
+	},
 };
 
 struct execmem_params __init *execmem_arch_params(void)
 {
+#ifdef CONFIG_64BIT
 	execmem_params.modules.text.start = MODULES_VADDR;
 	execmem_params.modules.text.end = MODULES_END;
+#else
+	execmem_params.modules.text.start = VMALLOC_START;
+	execmem_params.modules.text.end = VMALLOC_END;
+#endif
+
+	execmem_params.jit.text.start = VMALLOC_START;
+	execmem_params.jit.text.end = VMALLOC_END;
 
 	return &execmem_params;
 }
diff --git a/arch/riscv/kernel/probes/kprobes.c b/arch/riscv/kernel/probes/kprobes.c
index 2f08c14a933d..e64f2f3064eb 100644
--- a/arch/riscv/kernel/probes/kprobes.c
+++ b/arch/riscv/kernel/probes/kprobes.c
@@ -104,16 +104,6 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p)
 	return 0;
 }
 
-#ifdef CONFIG_MMU
-void *alloc_insn_page(void)
-{
-	return  __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END,
-				     GFP_KERNEL, PAGE_KERNEL_READ_EXEC,
-				     VM_FLUSH_RESET_PERMS, NUMA_NO_NODE,
-				     __builtin_return_address(0));
-}
-#endif
-
 /* install breakpoint in text */
 void __kprobes arch_arm_kprobe(struct kprobe *p)
 {
-- 
2.35.1