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charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org On Thu, Jul 20, 2023 at 08:59:12AM +0200, Alexandre Ghiti wrote: > On Fri, Jul 14, 2023 at 6:56 PM Charlie Jenkins wrote: > > > > The behavior of mmap is modified with this patch series, so explain the > > changes to the mmap hint address behavior. > > > > Signed-off-by: Charlie Jenkins > > --- > > Documentation/riscv/vm-layout.rst | 22 ++++++++++++++++++++++ > > 1 file changed, 22 insertions(+) > > > > diff --git a/Documentation/riscv/vm-layout.rst b/Documentation/riscv/vm-layout.rst > > index 5462c84f4723..892412b91300 100644 > > --- a/Documentation/riscv/vm-layout.rst > > +++ b/Documentation/riscv/vm-layout.rst > > @@ -133,3 +133,25 @@ RISC-V Linux Kernel SV57 > > ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF > > ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel > > __________________|____________|__________________|_________|____________________________________________________________ > > + > > + > > +Userspace VAs > > +-------------------- > > +To maintain compatibility with software that relies on the VA space with a > > +maximum of 48 bits the kernel will, by default, return virtual addresses to > > +userspace from a 48-bit range (sv48). This default behavior is achieved by > > +passing 0 into the hint address parameter of mmap. On CPUs with an address space > > +smaller than sv48, the CPU maximum supported address space will be the default. > > + > > +Software can "opt-in" to receiving VAs from another VA space by providing > > +a hint address to mmap. A call to mmap is guaranteed to return an address > > +that will not override the unset left-aligned bits in the hint address, > > +unless there is no space left in the address space. If there is no space > > +available in the requested address space, an address in the next smallest > > +available address space will be returned. > > + > > +For example, in order to obtain 48-bit VA space, a hint address greater than > > +:code:`1 << 38` must be provided. > > Is this correct? Shouldn't the hint be strictly greater than the > address space it targets? In patch 1, you state that "A hint address > passed to mmap will cause the largest address space that fits entirely > into the hint to be used", it seems contradictory to me. > That is a mistake, it should have a hint address greater than 1 << 47. I will fix up the wording here. > > Note that this is 38 due to sv39 userspace > > +ending at :code:`1 << 38` and the addresses beyond this are reserved for the > > +kernel. Similarly, to obtain 57-bit VA space addresses, a hint address greater > > +than or equal to :code:`1 << 47` must be provided. > > -- > > 2.41.0 > > From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 779A7C0015E for ; Wed, 26 Jul 2023 13:52:37 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; 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Wed, 26 Jul 2023 06:52:20 -0700 (PDT) Received: from ghost ([2601:c0:ca7f:e7c0:14ff:979a:dd27:29d7]) by smtp.gmail.com with ESMTPSA id d134-20020a63368c000000b0055be951145csm12722952pga.36.2023.07.26.06.52.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 06:52:19 -0700 (PDT) Date: Wed, 26 Jul 2023 09:52:15 -0400 From: Charlie Jenkins To: Alexandre Ghiti Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, conor@kernel.org, paul.walmsley@sifive.com, palmer@rivosinc.com, aou@eecs.berkeley.edu, anup@brainfault.org, konstantin@linuxfoundation.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, mick@ics.forth.gr, jrtc27@jrtc27.com, rdunlap@infradead.org Subject: Re: [PATCH v6 4/4] RISC-V: mm: Document mmap changes Message-ID: References: <20230714165508.94561-1-charlie@rivosinc.com> <20230714165508.94561-5-charlie@rivosinc.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230726_065223_228467_B78924B0 X-CRM114-Status: GOOD ( 28.93 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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