From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZRG1cVmT" Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E33B8D4E for ; Fri, 24 Nov 2023 11:51:46 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1700855506; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=OM2PxDAWg5kx5QEMWQSTwhnPULld33btKgMTQUPUfDc=; b=ZRG1cVmTx8Xy3nxVsuT4aESPtPXi42Vd4XLg9hhiVmN/lr2LiJaFr+r6+u/2jDFuC8S3y0 4QSaxYxj6okwPc7gWvHm1uzuWphwr1sehd+gl2yABvMJO9+mZ9QLBYjalCpouer/O1ob0/ mV44rqsSjI4hpB5+P10+WZkihIOUehs= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-561-i5b6auJkMb6iCjsfv5sWTw-1; Fri, 24 Nov 2023 14:51:42 -0500 X-MC-Unique: i5b6auJkMb6iCjsfv5sWTw-1 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-332e11a22a0so1175569f8f.2 for ; Fri, 24 Nov 2023 11:51:42 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700855501; x=1701460301; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :references:cc:to:content-language:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=OM2PxDAWg5kx5QEMWQSTwhnPULld33btKgMTQUPUfDc=; b=VoMGS+InaOFhXKFDeC5ewhNOWq4858oijYW/bEJmWPdT2YsB4qn850bEj6rtuNjs0o ZwRlGVmbHkLMRzvTzWDN3xNZY8BXSBivY+ltbiKHOcnd59zvOfFs/OXJd7ZZEY+IQrqx iYQ+Z8VsyKUpi2wJRZxs0sJA56NTEjlFUkgIR1AOYnVOJM/pryy3l5yZSn7OmWODy2zD LAC1fYxrKNxK8cto9khhu1mOUQkXdvWLg4sLwwzMrY7dujXpWsv1e5jkGFk09G8xrk2s r13bFA5IS4A9Loh4ok6RPPQ5c/OvtqSNomwDdvhIcTa2hrkhZ1KAGlZG9lYcgmSSHhup Ojvw== X-Gm-Message-State: AOJu0YzXspYptAOSJ/0kK4xYxH958aZ65qkM8MsIedr4MNEp9gXCo3li M2EJ0mtz0XmwxNn1B52I+V3pegb1fKN3AMS+D+znbqvnBjZFyOA1LIGUsJjzIwy1zOVFCLOMlHo KATAL9TgD1VTnFbEgB1hcFIz5tlSQxer4 X-Received: by 2002:a05:6000:b44:b0:331:6e10:e51d with SMTP id dk4-20020a0560000b4400b003316e10e51dmr3516300wrb.31.1700855501402; Fri, 24 Nov 2023 11:51:41 -0800 (PST) X-Google-Smtp-Source: AGHT+IHR+klacAa3ex/J93BAG94yzf34ZO2KgUyGSEVLDRRi0OCs9p1XGrjiniBUp5LdHCT2XI2b1Q== X-Received: by 2002:a05:6000:b44:b0:331:6e10:e51d with SMTP id dk4-20020a0560000b4400b003316e10e51dmr3516280wrb.31.1700855501001; Fri, 24 Nov 2023 11:51:41 -0800 (PST) Received: from ?IPV6:2003:cb:c721:a000:7426:f6b4:82a3:c6ab? (p200300cbc721a0007426f6b482a3c6ab.dip0.t-ipconnect.de. [2003:cb:c721:a000:7426:f6b4:82a3:c6ab]) by smtp.gmail.com with ESMTPSA id c13-20020adfe70d000000b003316aeb280esm4965195wrm.104.2023.11.24.11.51.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 24 Nov 2023 11:51:40 -0800 (PST) Message-ID: <91c5d2e2-57b1-4172-88e0-cd07a8d85af4@redhat.com> Date: Fri, 24 Nov 2023 20:51:38 +0100 Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC v2 13/27] arm64: mte: Make tag storage depend on ARCH_KEEP_MEMBLOCK To: Alexandru Elisei , catalin.marinas@arm.com, will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com Cc: pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, eugenis@google.com, kcc@google.com, hyesoo.yu@samsung.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org References: <20231119165721.9849-1-alexandru.elisei@arm.com> <20231119165721.9849-14-alexandru.elisei@arm.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: <20231119165721.9849-14-alexandru.elisei@arm.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 19.11.23 17:57, Alexandru Elisei wrote: > Tag storage memory requires that the tag storage pages used for data are > always migratable when they need to be repurposed to store tags. > > If ARCH_KEEP_MEMBLOCK is enabled, kexec will scan all non-reserved > memblocks to find a suitable location for copying the kernel image. The > kernel image, once loaded, cannot be moved to another location in physical > memory. The initialization code for the tag storage reserves the memblocks > for the tag storage pages, which means kexec will not use them, and the tag > storage pages can be migrated at any time, which is the desired behaviour. > > However, if ARCH_KEEP_MEMBLOCK is not selected, kexec will not skip a > region unless the memory resource has the IORESOURCE_SYSRAM_DRIVER_MANAGED > flag, which isn't currently set by the tag storage initialization code. > > Make ARM64_MTE_TAG_STORAGE depend on ARCH_KEEP_MEMBLOCK to make it explicit > that that the Kconfig option required for it to work correctly. > > Signed-off-by: Alexandru Elisei > --- > arch/arm64/Kconfig | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > index 047487046e8f..efa5b7958169 100644 > --- a/arch/arm64/Kconfig > +++ b/arch/arm64/Kconfig > @@ -2065,6 +2065,7 @@ config ARM64_MTE > if ARM64_MTE > config ARM64_MTE_TAG_STORAGE > bool "Dynamic MTE tag storage management" > + depends on ARCH_KEEP_MEMBLOCK > select CONFIG_CMA > help > Adds support for dynamic management of the memory used by the hardware Doesn't arm64 select that unconditionally? Why is this required then? -- Cheers, David / dhildenb