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=-8.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_PASS,USER_AGENT_MUTT 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 43B10C169C4 for ; Thu, 7 Feb 2019 03:01:38 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (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 B11D2217F9 for ; Thu, 7 Feb 2019 03:01:37 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="YlAmKKU0" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B11D2217F9 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43w34H5vmXzDqMb for ; Thu, 7 Feb 2019 14:01:35 +1100 (AEDT) Received: from ozlabs.org (bilbo.ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 43w30M60dJzDqMX for ; Thu, 7 Feb 2019 13:58:11 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dmarc=none (p=none dis=none) header.from=gibson.dropbear.id.au Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=gibson.dropbear.id.au header.i=@gibson.dropbear.id.au header.b="YlAmKKU0"; dkim-atps=neutral Received: by ozlabs.org (Postfix, from userid 1007) id 43w30M4Q9mz9sN8; Thu, 7 Feb 2019 13:58:11 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gibson.dropbear.id.au; s=201602; t=1549508291; bh=7X9TIj71WiyYmvnibicoKLKMVlTek4chAz0f0QKNqpI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=YlAmKKU0cMp6jXwYLSqDCMXp6mZOPwdWa56GNACC0nZb1GkQf60sE+ugcnWj8C872 MmOVBeeiuMTTyYJhCUPQNQ+UToASriXUD3hIlUJVOR+BbwYHxBgzEYHrYT43rehuq6 eKdrnR9GWpBY6PfDnMECtVfRnwdZz5dnI7K3r/UM= Date: Thu, 7 Feb 2019 13:49:50 +1100 From: David Gibson To: =?iso-8859-1?Q?C=E9dric?= Le Goater Subject: Re: [PATCH 06/19] KVM: PPC: Book3S HV: add a GET_ESB_FD control to the XIVE native device Message-ID: <20190207024950.GA22661@umbus.fritz.box> References: <20190107184331.8429-1-clg@kaod.org> <20190107184331.8429-7-clg@kaod.org> <20190204044531.GB1927@umbus.fritz.box> <69791b73-f93e-6957-92e8-5b8620b87731@kaod.org> <20190205052822.GE22661@umbus.fritz.box> <4d565738-a99b-0333-8533-037677358faa@kaod.org> <20190206012308.GP22661@umbus.fritz.box> <1745dd9f-2927-cae6-e8da-c350b0bd0a66@kaod.org> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="+9kyDs7IugQ0lHaC" Content-Disposition: inline In-Reply-To: <1745dd9f-2927-cae6-e8da-c350b0bd0a66@kaod.org> User-Agent: Mutt/1.10.1 (2018-07-13) X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, Paul Mackerras , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" --+9kyDs7IugQ0lHaC Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Feb 06, 2019 at 08:21:10AM +0100, C=E9dric Le Goater wrote: > On 2/6/19 2:23 AM, David Gibson wrote: > > On Tue, Feb 05, 2019 at 01:55:40PM +0100, C=E9dric Le Goater wrote: > >> On 2/5/19 6:28 AM, David Gibson wrote: > >>> On Mon, Feb 04, 2019 at 12:30:39PM +0100, C=E9dric Le Goater wrote: > >>>> On 2/4/19 5:45 AM, David Gibson wrote: > >>>>> On Mon, Jan 07, 2019 at 07:43:18PM +0100, C=E9dric Le Goater wrote: > >>>>>> This will let the guest create a memory mapping to expose the ESB = MMIO > >>>>>> regions used to control the interrupt sources, to trigger events, = to > >>>>>> EOI or to turn off the sources. > >>>>>> > >>>>>> Signed-off-by: C=E9dric Le Goater > >>>>>> --- > >>>>>> arch/powerpc/include/uapi/asm/kvm.h | 4 ++ > >>>>>> arch/powerpc/kvm/book3s_xive_native.c | 97 ++++++++++++++++++++++= +++++ > >>>>>> 2 files changed, 101 insertions(+) > >>>>>> > >>>>>> diff --git a/arch/powerpc/include/uapi/asm/kvm.h b/arch/powerpc/in= clude/uapi/asm/kvm.h > >>>>>> index 8c876c166ef2..6bb61ba141c2 100644 > >>>>>> --- a/arch/powerpc/include/uapi/asm/kvm.h > >>>>>> +++ b/arch/powerpc/include/uapi/asm/kvm.h > >>>>>> @@ -675,4 +675,8 @@ struct kvm_ppc_cpu_char { > >>>>>> #define KVM_XICS_PRESENTED (1ULL << 43) > >>>>>> #define KVM_XICS_QUEUED (1ULL << 44) > >>>>>> =20 > >>>>>> +/* POWER9 XIVE Native Interrupt Controller */ > >>>>>> +#define KVM_DEV_XIVE_GRP_CTRL 1 > >>>>>> +#define KVM_DEV_XIVE_GET_ESB_FD 1 > >>>>> > >>>>> Introducing a new FD for ESB and TIMA seems overkill. Can't you get > >>>>> to both with an mmap() directly on the xive device fd? Using the > >>>>> offset to distinguish which one to map, obviously. > >>>> > >>>> The page offset would define some sort of user API. It seems feasibl= e. > >>>> But I am not sure this would be practical in the future if we need t= o=20 > >>>> tune the length. > >>> > >>> Um.. why not? I mean, yes the XIVE supports rather a lot of > >>> interrupts, but we have 64-bits of offset we can play with - we can > >>> leave room for billions of ESB slots and still have room for billions > >>> of VPs. > >> > >> So the first 4 pages could be the TIMA pages and then would come =20 > >> the pages for the interrupt ESBs. I think that we can have different= =20 > >> vm_fault handler for each mapping. > >=20 > > Um.. no, I'm saying you don't need to tightly pack them. So you could > > have the ESB pages at 0, the TIMA at, say offset 2^60. >=20 > Well, we know that the TIMA is 4 pages wide and is "directly" related > with the KVM interrupt device. So being at offset 0 seems a good idea. > While the ESB segment is of a variable size depending on the number > of IRQs and it can come after I think. >=20 > >> I wonder how this will work out with pass-through. As Paul said in=20 > >> a previous email, it would be better to let QEMU request a new=20 > >> mapping to handle the ESB pages of the device being passed through. > >> I guess this is not a special case, just another offset and length. > >=20 > > Right, if we need multiple "chunks" of ESB pages we can given them > > each their own terabyte or several. No need to be stingy with address > > space. >=20 > You can not put them anywhere. They should map the same interrupt range > of ESB pages, overlapping with the underlying segment of IPI ESB pages.= =20 I don't really follow what you're saying here. --=20 David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. 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