From nobody Sun May 19 20:12:53 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 1678445733245883.6204040281509; Fri, 10 Mar 2023 02:55:33 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1paaPF-0001xy-Uz; Fri, 10 Mar 2023 05:55:26 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1paaOx-0001nl-CE for qemu-devel@nongnu.org; Fri, 10 Mar 2023 05:55:09 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1paaOs-0001Ky-Fk for qemu-devel@nongnu.org; Fri, 10 Mar 2023 05:55:07 -0500 Received: from [2001:8b0:10b:5:fea5:d438:64bd:2b44] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1paaOc-009JqB-Le; Fri, 10 Mar 2023 10:54:47 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=zIRKENNHfTDZF/EfquPyUHjRgqqud531QLhbV2qR3eM=; b=jrvq5mM7FaeUTyltUwOk7qMqS2 MUyki4g2oK0d52TKVTOpZbc4XpZXPoRU9M4/5DfmLdrijvTXUyAFu1tCyN9PFBxZaN90MFQFghztJ YGbppESEJg6TGXXQi3O9zG0c512wa3xF4AFG5VhRdmfUGfCsDZLhM3v7cv3KrM3XTWWzzY9oPOPqg jJyiMnC8wE1p6p+Lrg8ZP27KVH4PLp4OsfBQO/Rsbf+faDNeh2Xsf+S/ByLLrlWTP+iXUnwtibXbE /K5TVTITEryF6fLWPBWFAxSykKl5CDtjByh2skKxAXj4pUKq8rUYKcw5XcPcnc/M/oOCe8KFBBUY+ CL3ziDDw==; Message-ID: <4bae59aba8f3016afe295b2525ab76bb51ac3229.camel@infradead.org> Subject: [PATCH] hw/xen: Simplify emulated Xen platform init From: David Woodhouse To: Paolo Bonzini , Xiaoyao Li , Peter Maydell , qemu-devel@nongnu.org Cc: Paul Durrant , Joao Martins , Ankur Arora , Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , Thomas Huth , Alex =?ISO-8859-1?Q?Benn=E9e?= , Juan Quintela , "Dr . David Alan Gilbert" , Claudio Fontana , Julien Grall , "Michael S. Tsirkin" , Marcel Apfelbaum , armbru@redhat.com, Stefano Stabellini , vikram.garhwal@amd.com Date: Fri, 10 Mar 2023 10:54:45 +0000 In-Reply-To: <7d6e4ef2-1f27-f210-0378-879852a70024@redhat.com> References: <20230301135223.988336-1-dwmw2@infradead.org> <20230301135223.988336-16-dwmw2@infradead.org> <96e49428-0c2a-2a50-42e0-31c8e553a34b@intel.com> <7d6e4ef2-1f27-f210-0378-879852a70024@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-i8gwMM4upyjwZHHYgb/Q" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+1265cd07cee6da11af5a+7138+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1678445735693100001 --=-i8gwMM4upyjwZHHYgb/Q Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse I initially put the basic platform init (overlay pages, grant tables, event channels) into mc->kvm_type because that was the earliest place that could sensibly test for xen_mode=3D=3DXEN_EMULATE. The intent was to do this early enough that we could then initialise the XenBus and other parts which would have depended on them, from a generic location for both Xen and KVM/Xen in the PC-specific code, as seen in https://lore.kernel.org/qemu-devel/20230116221919.1124201-16-dwmw2@infradea= d.org/ However, then the Xen on Arm patches came along, and *they* wanted to do the XenBus init from a 'generic' Xen-specific location instead: https://lore.kernel.org/qemu-devel/20230210222729.957168-4-sstabellini@kern= el.org/ Since there's no generic location that covers all three, I conceded to do it for XEN_EMULATE mode in pc_basic_devices_init(). And now there's absolutely no point in having some of the platform init done from pc_machine_kvm_type(); we can move it all up to live in a single place in pc_basic_devices_init(). This has the added benefit that we can drop the separate xen_evtchn_connect_gsis() function completely, and pass just the system GSIs in directly to xen_evtchn_create(). While I'm at it, it does no harm to explicitly pass in the *number* of said GSIs, because it does make me twitch a bit to pass an array of impicit size. During the lifetime of the KVM/Xen patchset, that had already changed (albeit just cosmetically) from GSI_NUM_PINS to IOAPIC_NUM_PINS. And document a bit better that this is for the *output* GSI for raising CPU0's events when the per-CPU vector isn't available. The fact that we create a whole set of them and then only waggle the one we're told to, instead of having a single output and only *connecting* it to the GSI that it should be connected to, is still non-intuitive for me. Signed-off-by: David Woodhouse Reviewed-by: Paul Durrant --- hw/i386/kvm/xen_evtchn.c | 40 ++++++++++++++++++++-------------------- hw/i386/kvm/xen_evtchn.h | 3 +-- hw/i386/pc.c | 13 ++++--------- 3 files changed, 25 insertions(+), 31 deletions(-) diff --git a/hw/i386/kvm/xen_evtchn.c b/hw/i386/kvm/xen_evtchn.c index 98a7b85047..f4204949fb 100644 --- a/hw/i386/kvm/xen_evtchn.c +++ b/hw/i386/kvm/xen_evtchn.c @@ -146,7 +146,10 @@ struct XenEvtchnState { QemuMutex port_lock; uint32_t nr_ports; XenEvtchnPort port_table[EVTCHN_2L_NR_CHANNELS]; - qemu_irq gsis[IOAPIC_NUM_PINS]; + + /* Connected to the system GSIs for raising callback as GSI / INTx */ + unsigned int nr_callback_gsis; + qemu_irq *callback_gsis; =20 struct xenevtchn_handle *be_handles[EVTCHN_2L_NR_CHANNELS]; =20 @@ -298,7 +301,7 @@ static void gsi_assert_bh(void *opaque) } } =20 -void xen_evtchn_create(void) +void xen_evtchn_create(unsigned int nr_gsis, qemu_irq *system_gsis) { XenEvtchnState *s =3D XEN_EVTCHN(sysbus_create_simple(TYPE_XEN_EVTCHN, -1, NULL)); @@ -309,8 +312,19 @@ void xen_evtchn_create(void) qemu_mutex_init(&s->port_lock); s->gsi_bh =3D aio_bh_new(qemu_get_aio_context(), gsi_assert_bh, s); =20 - for (i =3D 0; i < IOAPIC_NUM_PINS; i++) { - sysbus_init_irq(SYS_BUS_DEVICE(s), &s->gsis[i]); + /* + * These are the *output* GSI from event channel support, for + * signalling CPU0's events via GSI or PCI INTx instead of the + * per-CPU vector. We create a *set* of irqs and connect one to + * each of the system GSIs which were passed in from the platform + * code, and then just trigger the right one as appropriate from + * xen_evtchn_set_callback_level(). + */ + s->nr_callback_gsis =3D nr_gsis; + s->callback_gsis =3D g_new0(qemu_irq, nr_gsis); + for (i =3D 0; i < nr_gsis; i++) { + sysbus_init_irq(SYS_BUS_DEVICE(s), &s->callback_gsis[i]); + sysbus_connect_irq(SYS_BUS_DEVICE(s), i, system_gsis[i]); } =20 /* @@ -335,20 +349,6 @@ void xen_evtchn_create(void) xen_evtchn_ops =3D &emu_evtchn_backend_ops; } =20 -void xen_evtchn_connect_gsis(qemu_irq *system_gsis) -{ - XenEvtchnState *s =3D xen_evtchn_singleton; - int i; - - if (!s) { - return; - } - - for (i =3D 0; i < IOAPIC_NUM_PINS; i++) { - sysbus_connect_irq(SYS_BUS_DEVICE(s), i, system_gsis[i]); - } -} - static void xen_evtchn_register_types(void) { type_register_static(&xen_evtchn_info); @@ -429,8 +429,8 @@ void xen_evtchn_set_callback_level(int level) return; } =20 - if (s->callback_gsi && s->callback_gsi < IOAPIC_NUM_PINS) { - qemu_set_irq(s->gsis[s->callback_gsi], level); + if (s->callback_gsi && s->callback_gsi < s->nr_callback_gsis) { + qemu_set_irq(s->callback_gsis[s->callback_gsi], level); if (level) { /* Ensure the vCPU polls for deassertion */ kvm_xen_set_callback_asserted(); diff --git a/hw/i386/kvm/xen_evtchn.h b/hw/i386/kvm/xen_evtchn.h index bfb67ac2bc..b740acfc0d 100644 --- a/hw/i386/kvm/xen_evtchn.h +++ b/hw/i386/kvm/xen_evtchn.h @@ -16,10 +16,9 @@ =20 typedef uint32_t evtchn_port_t; =20 -void xen_evtchn_create(void); +void xen_evtchn_create(unsigned int nr_gsis, qemu_irq *system_gsis); int xen_evtchn_soft_reset(void); int xen_evtchn_set_callback_param(uint64_t param); -void xen_evtchn_connect_gsis(qemu_irq *system_gsis); void xen_evtchn_set_callback_level(int level); =20 int xen_evtchn_set_port(uint16_t port); diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 1489abf010..25584cb8f3 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1319,7 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