From nobody Mon May 13 23:45:20 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 1693425661577962.9624585184063; Wed, 30 Aug 2023 13:01:01 -0700 (PDT) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qbRMG-0000PA-Oa; Wed, 30 Aug 2023 16:00:09 -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 1qbRMF-0000DH-7S for qemu-devel@nongnu.org; Wed, 30 Aug 2023 16:00:07 -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 1qbRMB-0002Ai-W3 for qemu-devel@nongnu.org; Wed, 30 Aug 2023 16:00:06 -0400 Received: from [2001:8b0:10b:5:f75b:6505:1165:4f9a] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qbRLu-00EgGt-D9; Wed, 30 Aug 2023 19:59:46 +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:Date:Cc:To: From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:In-Reply-To:References; bh=dTH3sSJczab8rqZQYOKRM5oagEGFN+P/wiIToNru6QQ=; b=BeJSGSsBDvrzsaaG0C9tCIrEOI JeYJWuAABlJV8wFvN+dntCvxhNkZxQK/wmL5xgATHPMJqtl849Yk/y/ipYwErWv2JhX5J5II9058p +oE9NIFHzExLQ/Q2IudkqZExJ0wgJTI6QpNgEvhaU/t5rfil6NRnlJI6O6mBmD5/BsKJWSYfXzMX1 dOCQKhvfpqDu/307F/cXdgqv63AJt5biJyAQZH6UbDkrTW/G06HT2gWbBOLaegnkCZxtzcNFjiFdb X3o0nmEtzO/PKjq2ThG42GkQ+4swF4+Txbhui71N3B5xByKVkI7Lb4tYsGkGsoo5TxjyhdAjPuexV J8dk9rTA==; Message-ID: <112a09643b8191c4eae7d92fa247a861ab90a9ee.camel@infradead.org> Subject: [PATCH] hw/isa/ich9: Add comment on imperfect emulation of PIC vs. I/O APIC routing From: David Woodhouse To: qemu-devel Cc: "Michael S. Tsirkin" , Marcel Apfelbaum , Joel Upham Date: Wed, 30 Aug 2023 20:59:43 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-Lf6iGIpTmPVdVojSpYNI" 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: 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+95b5e436ce2346f297cf+7311+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-Zoho-AV-Stamp: zmail-av-1.1.0/193.336.38 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1693425664024100001 --=-Lf6iGIpTmPVdVojSpYNI Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse As noted in the comment, the PCI INTx lines are supposed to be routed to *both* the PIC and the I/O APIC. It's just that we don't cope with the concept of an IRQ being asserted to two *different* pins on the two irqchips. So we have this hack of routing to I/O APIC only if the PIRQ routing to the PIC is disabled. Which seems to work well enough, even when I try hard to break it with kexec. But should be explicitly documented and understood. Signed-off-by: David Woodhouse --- hw/isa/lpc_ich9.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/hw/isa/lpc_ich9.c b/hw/isa/lpc_ich9.c index 9c47a2f6c7..399fd04b6b 100644 --- a/hw/isa/lpc_ich9.c +++ b/hw/isa/lpc_ich9.c @@ -304,6 +304,21 @@ static PCIINTxRoute ich9_route_intx_pin_to_irq(void *o= paque, int pirq_pin) route.irq =3D -1; } } else { + /* + * Strictly speaking, this is wrong. The PIRQ should be routed + * to *both* the I/O APIC and the PIC, on different pins. The + * I/O APIC has a fixed mapping to IRQ16-23, while the PIC is + * routed according to the PIRQx_ROUT configuration. But QEMU + * doesn't (yet) cope with the concept of pin numbers differing + * between PIC and I/O APIC, and neither does the in-kernel KVM + * irqchip support. So we route to the I/O APIC *only* if the + * routing to the PIC is disabled in the PIRQx_ROUT settings. + * + * This seems to work even if we boot a Linux guest with 'noapic' + * to make it use the legacy PIC, and then kexec directly into a + * new kernel which uses the I/O APIC. The new kernel explicitly + * disables the PIRQ routing even though it doesn't need to care. + */ route.irq =3D ich9_pirq_to_gsi(pirq_pin); } =20 --=20 2.34.1 --=-Lf6iGIpTmPVdVojSpYNI Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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