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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id ADAB4C54EBE for ; Mon, 16 Jan 2023 19:49:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231921AbjAPTtK (ORCPT ); Mon, 16 Jan 2023 14:49:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52976 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232546AbjAPTtG (ORCPT ); Mon, 16 Jan 2023 14:49:06 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EEDDB22A0F; Mon, 16 Jan 2023 11:49:04 -0800 (PST) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1673898543; 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; bh=bsQIYS8Reb5+JjRsIyy9SKu5zYksjmBvIj9vz87cqIA=; b=heEkt7NaYvIze8aJGQVSQyHNSN98z+Wfxq09MbTTdqrC+XKiOY0rDosjUd0z1XsSIluw/P Cr2Q5VCIR8uXtuiK6mYkB9j8V15SmnDnNd8MoO3oU3y7irPN42IRU27Jh4H/8wglTGEH25 9Om5jylGiPoSEa68SE/xeQLD4UTAezrquPJe+NbYT4vogs55O4A6M/3mLcrXBt9/Z0vmdW /zROGTl2f7ioJ0ivQfFu0FFh7UFomXQK/1HkCSm7uVxq64vpQlA1SwezuakhBjKTLuBmk7 6vupSlP1XINVTJeEQoKgecPdHcR9dTYuuWNP5NIzbbxbWCCMdpieSqhH0Bk9kQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1673898543; 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; bh=bsQIYS8Reb5+JjRsIyy9SKu5zYksjmBvIj9vz87cqIA=; b=bfhTZB4zqL0K6JB8VZXUJnVxNs2r97QdIbh0E82HuZsZVNPSxYCPU420T4qGOhJ+vpVXFQ NsX/lhRHJD/orPDQ== To: David Woodhouse , LKML , Juergen Gross , xen-devel Cc: x86@kernel.org, Joerg Roedel , Will Deacon , linux-pci@vger.kernel.org, Bjorn Helgaas , Lorenzo Pieralisi , Marc Zyngier , Greg Kroah-Hartman , Jason Gunthorpe , Dave Jiang , Alex Williamson , Kevin Tian , Dan Williams , Logan Gunthorpe , Ashok Raj , Jon Mason , Allen Hubbe Subject: Re: [patch V3 16/22] genirq/msi: Provide new domain id based interfaces for freeing interrupts In-Reply-To: <57f3f757aaceccf866172faaf48ab62916f24d8b.camel@infradead.org> References: <20221124225331.464480443@linutronix.de> <20221124230314.337844751@linutronix.de> <1901d84f8f999ac6b2f067360f098828cb8c17cf.camel@infradead.org> <875yd6o2t7.ffs@tglx> <871qnunycr.ffs@tglx> <87h6wqmgio.ffs@tglx> <57f3f757aaceccf866172faaf48ab62916f24d8b.camel@infradead.org> Date: Mon, 16 Jan 2023 20:49:02 +0100 Message-ID: <87edrumf9t.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org David! On Mon, Jan 16 2023 at 19:28, David Woodhouse wrote: > On Mon, 2023-01-16 at 20:22 +0100, Thomas Gleixner wrote: >> > Tested-by: David Woodhouse >> >=20 >> > Albeit only under qemu with >> > https://git.infradead.org/users/dwmw2/qemu.git/shortlog/refs/heads/xen= fv >> > and not under real Xen. >>=20 >> Five levels of emulation. What could possibly go wrong? > > It's the opposite =E2=80=94 this is what happened when I threw my toys ou= t of > the pram and said, "You're NOT doing that with nested virtualization!". > > One level of emulation. We host guests that think they're running on > Xen, directly in QEMU/KVM by handling the hypercalls and event > channels, grant tables, etc. > > We virtualised Xen itself :) Groan. Can we please agree on *one* hypervisor instead of growing emulators for all other hypervisors in each of them :) > Now you have no more excuses for breaking Xen guest mode! No cookies, you spoilsport! :) tglx