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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F1A5C433E0 for ; Tue, 9 Mar 2021 09:41:34 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id AB48D6523D for ; Tue, 9 Mar 2021 09:41:33 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org AB48D6523D Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:43952 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1lJYrs-0000lx-PZ for qemu-devel@archiver.kernel.org; Tue, 09 Mar 2021 04:41:32 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:34630) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1lJYmc-0005r4-Fa for qemu-devel@nongnu.org; Tue, 09 Mar 2021 04:36:06 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31016) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1lJYmV-0000AP-N0 for qemu-devel@nongnu.org; Tue, 09 Mar 2021 04:36:05 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1615282557; h=from:from:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:in-reply-to:in-reply-to: references:references; bh=JmnSyCEyTOjhy6kHkOaGYEfGKRCJ3xRRvyLfE2fsCQk=; b=eNu0jCIkBKp6NmJkzN+02svtrnZDk7JcityP0Ie1ivw6SB9YBil1/do+VqhqNPwG1pstTt hjcHsBppl+wsqErK8hUwIrzKBqCZYW6XKPPawTfvz1d5iA5FkJogAqpLc7GiuaEO7gqb73 KKxvUQeVKD/2yLqRIiBI2fQcib9KAWg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-591-2lNhpmtrO3O2fRMb8jF2aA-1; Tue, 09 Mar 2021 04:35:55 -0500 X-MC-Unique: 2lNhpmtrO3O2fRMb8jF2aA-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.phx2.redhat.com [10.5.11.15]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 275DA801814; Tue, 9 Mar 2021 09:35:54 +0000 (UTC) Received: from redhat.com (ovpn-114-154.ams2.redhat.com [10.36.114.154]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 89FFE3A47; Tue, 9 Mar 2021 09:35:48 +0000 (UTC) Date: Tue, 9 Mar 2021 09:35:45 +0000 From: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= To: Joelle van Dyne Subject: Re: [PATCH] coroutine: add libucontext as external library Message-ID: References: <20210309032637.41778-1-j@getutm.app> MIME-Version: 1.0 In-Reply-To: <20210309032637.41778-1-j@getutm.app> User-Agent: Mutt/2.0.5 (2021-01-21) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=berrange@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Received-SPF: pass client-ip=216.205.24.124; envelope-from=berrange@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.251, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: Daniel =?utf-8?B?UC4gQmVycmFuZ8Op?= Cc: Kevin Wolf , Paolo Bonzini , qemu-devel@nongnu.org, Stefan Hajnoczi , Peter Maydell Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Mon, Mar 08, 2021 at 07:26:36PM -0800, Joelle van Dyne wrote: > iOS does not support ucontext natively for aarch64 and the sigaltstack is > also unsupported (even worse, it fails silently, see: > https://openradar.appspot.com/13002712 ) > > As a workaround we include a library implementation of ucontext and add it > as a build option. The README here: https://github.com/kaniini/libucontext indicates that it is intentionally limiting what registers it saves and restores, explicitly excluding FPU. Peter & Paolo expressed concern about this, indicating FPU reg support was a requirement for QEMU: https://lists.gnu.org/archive/html/qemu-devel/2021-01/msg05525.html Regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|