From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.nessuent.net (mail.nessuent.net [188.245.177.90]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A43C39B95E for ; Sat, 9 May 2026 14:47:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=188.245.177.90 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778338077; cv=none; b=b7rwxNaxb05N7AJKnW7LkcE23H4GdYk0eSkA8t6vuBBNhF+LAJiGMYT7ttgO8mWr8kNhV8CuabjXi4KX9gR1+c0m25RGRJcHG4oLFf53PFO/a2R6S0Vtuwp2CXnAm8/wS9d7E53kyRwiSJbT21sI0seleawaKbOTMMMNb/IFWcs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1778338077; c=relaxed/simple; bh=ueMYbnhP380gUpqP1QHJlQrrjstYCaH5Rry1n19OITA=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=LYEdSsrFJfZJUigpJOthGb5Ew/DqNPxtCQZeSggJiSuAarP1VL/0siZhb7j01vHOexG6zYz/1Bpiu4RYr2YK1f4Ofn22EduPeGFvNaDLp97Ib4LB4J/u2V9PuWI79j8kDYMDF8e1oXpdcsSjXZIR49VWJZCsnkqrB6sxCzMQywM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=pitsidianak.is; spf=pass smtp.mailfrom=pitsidianak.is; dkim=pass (4096-bit key) header.d=pitsidianak.is header.i=@pitsidianak.is header.b=041vrqZW; arc=none smtp.client-ip=188.245.177.90 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=pitsidianak.is Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=pitsidianak.is Authentication-Results: smtp.subspace.kernel.org; dkim=pass (4096-bit key) header.d=pitsidianak.is header.i=@pitsidianak.is header.b="041vrqZW" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=pitsidianak.is; s=mailSelector; t=1778338059; bh=ueMYbnhP380gUpqP1QHJlQrrjstYCaH5Rry1n19OITA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From:Subject; b=041vrqZWUzBncqPBFlJdGBaf3dfDPmwxTpDAISVR7NztU7ysAFahCK47tD1PwryF1 mducX7RaJSVRH7qAViJWfauPSR5dsSFXThHfYb4j4BXv1xicmwQOU7dqmVtt5IA0Lq OdDNiElXI/BmgK1H/ONaviGaVbWPPgoaRNzykUMzm5GeWheT6SApDWVF2jCvOG67Yu r55k82G6XI8Z8n613pEK7Nx0G7Tq+aiSbbbSX88nPHczcY47AxOuftKTWVs/lmeFCU QG6gFypLWqDHlVMY+cOkaa6LzAePzvcNt46XvLOf2xamo3GXw4PCipTHlOshpTdwlG F7++jPM04aQy/1ogRe5HFpR1aI+53tB9Jd3ZUBD0unbgO2qWGTxOc5Q9hk1NCmMiL8 /LGjYHgKR+je0/X4hgNtqztapwwX/OggNNRs7PKrFRY6xh2sWWeiJig6aC/3En6SRG k/OUZhva4p/sB4K4iLrg/QxCReZmt38L6eeiQvyHm1jrnh1sTKPk4cv3BiRPbHSuwn /vu592zLbCj34neeELnlbW55K7VDGCfGgHTzm0dAOUZvP4da5pUviXxo3CF/nYCG4d jdWHuiq95E7RrKEkDeRNHqaVc+XCiV2ITvClhJOC79A+sB68Mwf7FRjLXuu7PNgoYs JXiUknRouRR+q6YR1SM5cPcA= From: Manos Pitsidianakis Date: Sat, 09 May 2026 17:46:58 +0300 Subject: [PATCH RFC v2 4/6] rust/scatterlist: add SGEntry::init_one Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260509-rust-virtio-v2-4-c1e30ec2bd21@pitsidianak.is> References: <20260509-rust-virtio-v2-0-c1e30ec2bd21@pitsidianak.is> In-Reply-To: <20260509-rust-virtio-v2-0-c1e30ec2bd21@pitsidianak.is> To: Miguel Ojeda Cc: Manos Pitsidianakis , Peter Hilber , Stefano Garzarella , Stefan Hajnoczi , Viresh Kumar , "Michael S. Tsirkin" , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , rust-for-linux@vger.kernel.org, Jason Wang , Xuan Zhuo , =?utf-8?q?Eugenio_P=C3=A9rez?= , virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, Manos Pitsidianakis X-Developer-Signature: v=1; a=openpgp-sha256; l=1545; i=manos@pitsidianak.is; h=from:subject:message-id; bh=ueMYbnhP380gUpqP1QHJlQrrjstYCaH5Rry1n19OITA=; b=LS0tLS1CRUdJTiBQR1AgTUVTU0FHRS0tLS0tCgpvd0VCYlFLUy9aQU5Bd0FLQVhjcHgzQi9mZ 25RQWNzbVlnQnAvMGtEWEpWU0t5ck92MUF3M1d3d2JZQnBZeHVBClpRVTJlanNMK2djZjVSdEth bGVKQWpNRUFBRUtBQjBXSVFUTVhCdE9SS0JXODRkd0hSQjNLY2R3ZjM0SjBBVUMKYWY5SkF3QUt DUkIzS2Nkd2YzNEowRTRtRC85Z1M4dXpFZ0tzSGV2bXpxcGhoRzI0bmY3MkpIaFI1MHlYQzMrVw podkh4RFp0Q0Nvc1NTM2k1VHhxMFB4Y1BjYU1VV09pTWxGbm9RMGVvWEhZNGF4VnVDNFhQY2gwM TFMS1NhVHpOCnk0TGVSay84SExRUjV3Vlh6R09xbWhzVzlicmF4SmFtTTNmSnJQQVQ4dTZlaFcv Q3BOcEZFQy9rWHExU0FjOEwKNVV1SjZkNWduQm5DSUcxVlQ0OVRCTklIYmVnVWxTVlVqeDlCRnF PTllRcHRVc1NBZ0tLVTUrYUJjbmtjL0pDcgpGTHArUHhhTkNiRTVwUmxOR0FOamZoNklNTUo0U2 VDT1Z1VGs0ZEZIMkpBOU5yV1VuWVlNa1RXdWhDWHc1cytUCnlNT3JlRGdqaFdzcHNoYjVCSGw4R 3ZEdUQrMDQwT3F4ckxtb1k1T0pYSXU3MnBqemlwd0wrSkFrclNhQ2grdDMKczZrcGc3R0l6Q0FI b1paMUV5V0tsWjZmMHQzVms0QitsbllYY0owYTlNSWRFUUtBVGlnakZiQUUyVmI5aFF3Rwp2alF QaGdwMk5MZ1U2VDNydkVyNGpydnRFNzYxVG1wVzM5ekNpM0VOcEF1ZzB2OHB4R3BzZkMrdGg2aD MyOUo1Cmx2R2dCTTNyOVpjM2NhaVR3dGxRa2tIcVBHVGpReThJT25xeUY0UDYyVytQNXVRcjBYT GhaQ2FxM2x3aDRhZC8KMDdLc256cDluUTlWbTAyM1kzUHR5TFdjK2poYjI0ZjFaOTVvaDYyVk1C TFVDUWUzQXlTRkw5YmIzYlhoZEpFdAppY0wxTUJkazJPS3lyY0lqWkRBc2Q0cVp3ZkRUZ09LVTJ YN3c3QTI0QjFpYXM4RUo2djVFUHRqRmlhcmN3dXFXCkVDODZ1dz09Cj1mSVQ5Ci0tLS0tRU5EIF BHUCBNRVNTQUdFLS0tLS0K X-Developer-Key: i=manos@pitsidianak.is; a=openpgp; fpr=7C721DF9DB3CC7182311C0BF68BC211D47B421E1 Add a method to allow creation of an SGEntry with borrowed data. Analogous of `sg_init_one` in C. Signed-off-by: Manos Pitsidianakis --- rust/kernel/scatterlist.rs | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/rust/kernel/scatterlist.rs b/rust/kernel/scatterlist.rs index 146e738cbd4351b41c11dd39a45e20f404c5cd64..b065762af1a734fcdd5d3acde89199f1a626fd89 100644 --- a/rust/kernel/scatterlist.rs +++ b/rust/kernel/scatterlist.rs @@ -95,6 +95,24 @@ pub fn dma_len(&self) -> ResourceSize { // SAFETY: `self.as_raw()` is a valid pointer to a `struct scatterlist`. unsafe { bindings::sg_dma_len(self.as_raw()) }.into() } + + /// Initialize a new entry with borrowed data. + /// + /// # Safety + /// + /// Callers must ensure that: + /// - `buf` is a valid pointer + /// - `buf_len` describes a valid allocation size for this pointer + pub unsafe fn init_one( + val: &'_ mut core::mem::MaybeUninit, + buf: NonNull, + buf_len: u32, + ) -> &'_ Self { + // SAFETY: `val` points to a correctly sized `struct scatterlist`. + unsafe { bindings::sg_init_one(val.as_mut_ptr(), buf.as_ptr().cast(), buf_len) }; + // SAFETY: `val` points to an initialized `struct scatterlist`. + unsafe { Self::from_raw(val.as_mut_ptr()) } + } } /// The borrowed generic type of an [`SGTable`], representing a borrowed or externally managed -- 2.47.3