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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 06E24C3DA63 for ; Wed, 24 Jul 2024 12:08:23 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sWaml-00043Q-Oz; Wed, 24 Jul 2024 08:07:59 -0400 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 1sWamh-000421-HJ for qemu-devel@nongnu.org; Wed, 24 Jul 2024 08:07:55 -0400 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 1sWame-0004I7-L9 for qemu-devel@nongnu.org; Wed, 24 Jul 2024 08:07:55 -0400 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=KengXMNm7vthw/AXqE+efLUHwi588seo4wDSjrgCg5Y=; b=blEIZtKpcHNBfq3FKxQGAem/YZ owTtb1EMeAl6WsR4ukB/sorRvmFcxaOyoEx9eEIuE7wEWLtdH+FuR2slApClFimaWhhCkaucMy3cU 8IXIhJMQtWkrbRIqyDHHYxy0PmbahOWkfE1+dwdDWM1FfhqjtbbBv0njevoeowDsj7MVO+MbIwrhv 7Kzkn4NXCJd5KHJTbMteibBXe9uTJrhJtTat+SqwHwE0krV3h01cuYlf7iajbNlgfzAo38u/dP4jA cINrx8WxVHCoIgtea4uy6TBJT1YHaiLpnEf7BNQ0jNZlj8XqGy1NwuT9QEvpN6sxJ18isl4/Jj2nr SqeaRf2A==; Received: from [2001:8b0:10b:5:6c80:46ed:51d:4ac6] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sWama-00000007nhe-3mBn; Wed, 24 Jul 2024 12:07:49 +0000 Message-ID: <6913716c615aaeef146bfd06771ee1d0c6fd352a.camel@infradead.org> Subject: Re: [PATCH] hw/intc/ioapic: Delete a wrong IRQ redirection on I/O APIC From: David Woodhouse To: Paolo Bonzini , TaiseiIto Cc: qemu-devel@nongnu.org, mst@redhat.com Date: Wed, 24 Jul 2024 13:07:48 +0100 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-HYAGthwSXsEcf+EcDcD4" User-Agent: Evolution 3.44.4-0ubuntu2 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: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+4a029e35608e1ffcd358+7640+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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-HYAGthwSXsEcf+EcDcD4 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-07-23 at 16:15 +0200, Paolo Bonzini wrote: > On Tue, Jun 25, 2024 at 2:03=E2=80=AFPM TaiseiIto = wrote: > > Before this commit, interruptions from i8254 which should be sent to IR= Q0 > > were sent to IRQ2. After this commit, these are correctly sent to IRQ0.= When > > I had an HPET timer generate interruptions once per second to test an H= PET > > driver in my operating system on QEMU, I observed more frequent > > interruptions than I configured on the HPET timer. I investigated the c= ause > > and found that not only interruptions from HPET but also interruptions = from > > i8254 were sent to IRQ2 because of a redirection from IRQ0 to IRQ2. Thi= s > > redirection is added in hw/apic.c at commit > > 16b29ae1807b024bd5052301550f5d47dae958a2 but this redirection caused wr= ong > > interruptions. So I deleted the redirection. Finally, I confirmed there= is > > no problem on 'make check' results and that interruptions from i8254 an= d > > interruptions from HPET are correclty sent to IRQ0 and IRQ2 respectivel= y. >=20 > Hi, did you set the legacy replacement route bit on the HPET? >=20 > My understanding is that: > - if you enable legacy-replacement routing, the HPET will take care of > dropping all i8254 interrupts > - if you disable legacy-replacement routing, the i8254 will still > generate interrupts on ISA IRQ 0. If you then enable the IO-APIC and > program the routes according to the ACPI MADT table, the interrupt > from the i8254 (ISA IRQ 0) will be redirected to the IO-APIC's GSI2. >=20 > So the solutions would be one of the following if you use HPET timer 0: > - disable the i8254 > - enable legacy-replacement routing > - mask GSI2 on the IO-APIC and use a different route for the HPET > (worse, but should also work) Or we delete the existing hack which redirects IRQ0=E2=86=92IRQ2 in the I/O= APIC and replace it with an IRQ2=E2=86=92IRQ0 hack in gsi_handler(), as seen in https://mail.gnu.org/archive/html/qemu-devel/2023-10/msg06163.html --=-HYAGthwSXsEcf+EcDcD4 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG 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