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De Francesco" , "op-tee@lists.trustedfirmware.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" Subject: Re: [PATCH 2/4] tee: Remove vmalloc page support Message-ID: References: <20221002002326.946620-1-ira.weiny@intel.com> <20221002002326.946620-3-ira.weiny@intel.com> <20221010074234.GA20788@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1665424680; a=rsa-sha256; cv=none; b=vOqSCmoM02fE3ThRlpocW1ESnLQH1fxLXTySfRUKIBKszToQf5A6Wzpd621BRNWZaWIrhz hMx7IdV0312TaUvFnYpoC81t5TsGpbZ/OmDqNt9x5qkB66a1GCj5Y/7sffieNBr+7HreAe Ia0xc+T7Y2w4Pakyr+V7PEA0WFCo7Pk= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=linux.org.uk header.s=zeniv-20220401 header.b=vMY7Y5qY; spf=none (imf16.hostedemail.com: domain of viro@ftp.linux.org.uk has no SPF policy when checking 62.89.141.173) smtp.mailfrom=viro@ftp.linux.org.uk; dmarc=pass (policy=none) header.from=zeniv.linux.org.uk ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1665424680; h=from:from:sender:sender: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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=gXJyMs2OSPDhCkEvqWP7QOCysCbcI9dfM5n2nlK7y4M=; b=xeLUFDuBF4qk4uDptdXHhBXh4ue48a1aacoL4r5fdoxDwCqPp7roBwEkppTALZ0HPny9gN ZnstHn9mMMJ4Pc5mM299KcijHPI1222WwwbUTS4mnuzaSbLs+/eXOUybivUgcHkmk1H6oi QXlALhcTluDs7ExmYA3MkWXjo2eKzu8= Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=linux.org.uk header.s=zeniv-20220401 header.b=vMY7Y5qY; spf=none (imf16.hostedemail.com: domain of viro@ftp.linux.org.uk has no SPF policy when checking 62.89.141.173) smtp.mailfrom=viro@ftp.linux.org.uk; dmarc=pass (policy=none) header.from=zeniv.linux.org.uk X-Stat-Signature: dkfjjko1bp3xdyty1xif6qd4dkf5ctaw X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 91D4818001E X-Rspam-User: X-HE-Tag: 1665424679-841524 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Oct 10, 2022 at 10:20:15AM -0700, Linus Torvalds wrote: > On Mon, Oct 10, 2022 at 12:42 AM Christoph Hellwig wrote: > > > > I suspect the best long term option would be to just pass an iov_iter.. > > Hmm. Yeah, that sounds like a workable model, and solves the problem > JensW pointed out with my simplistic "just pass a page array" approach > where you also need to keep track of how to release things. Except that then you need to get iov_iter_get_pages analogue that would work for ITER_KVEC, which is exact same problem right back.