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Thu, 18 Jun 2020 04:56:04 -0400 X-MC-Unique: bZPApbCcOcWmfkCGC_nWrg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id DD59B1800D42; Thu, 18 Jun 2020 08:56:01 +0000 (UTC) Received: from [10.36.114.105] (ovpn-114-105.ams2.redhat.com [10.36.114.105]) by smtp.corp.redhat.com (Postfix) with ESMTP id 555E95C1D6; Thu, 18 Jun 2020 08:55:59 +0000 (UTC) Subject: Re: [PATCH 2/3] arm64: use PAGE_KERNEL_ROX directly in alloc_insn_page To: Christoph Hellwig , Andrew Morton Cc: Dexuan Cui , Vitaly Kuznetsov , Peter Zijlstra , Catalin Marinas , Will Deacon , Jessica Yu , x86@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-mm@kvack.org References: <20200618064307.32739-1-hch@lst.de> <20200618064307.32739-3-hch@lst.de> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200618064307.32739-3-hch@lst.de> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org On 18.06.20 08:43, Christoph Hellwig wrote: > Use PAGE_KERNEL_ROX directly instead of allocating RWX and setting the > page read-only just after the allocation. > > Signed-off-by: Christoph Hellwig > --- > arch/arm64/kernel/probes/kprobes.c | 12 +++--------- > 1 file changed, 3 insertions(+), 9 deletions(-) > > diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c > index d1c95dcf1d7833..cbe49cd117cfec 100644 > --- a/arch/arm64/kernel/probes/kprobes.c > +++ b/arch/arm64/kernel/probes/kprobes.c > @@ -120,15 +120,9 @@ int __kprobes arch_prepare_kprobe(struct kprobe *p) > > void *alloc_insn_page(void) > { > - void *page; > - > - page = vmalloc_exec(PAGE_SIZE); > - if (page) { > - set_memory_ro((unsigned long)page, 1); > - set_vm_flush_reset_perms(page); > - } > - > - return page; > + return __vmalloc_node_range(PAGE_SIZE, 1, VMALLOC_START, VMALLOC_END, > + GFP_KERNEL, PAGE_KERNEL_ROX, VM_FLUSH_RESET_PERMS, > + NUMA_NO_NODE, __func__); I do wonder if something like vmalloc_prot(size, prot) would make this (and the other two users) easier to read. So instead of ripping out vmalloc_exec(), converting it into vmalloc_prot() instead. Did you consider that? Apart from that LGTM > } > > /* arm kprobe: install breakpoint in text */ > -- Thanks, David / dhildenb