From nobody Tue Apr 23 22:49:54 2024 Delivered-To: importer@patchew.org Received-SPF: pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) client-ip=192.237.175.120; envelope-from=xen-devel-bounces@lists.xenproject.org; helo=lists.xenproject.org; Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zohomail.com: domain of lists.xenproject.org designates 192.237.175.120 as permitted sender) smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Return-Path: Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) by mx.zohomail.com with SMTPS id 1679049219637269.9246138036797; Fri, 17 Mar 2023 03:33:39 -0700 (PDT) Received: from list by lists.xenproject.org with outflank-mailman.510990.789633 (Exim 4.92) (envelope-from ) id 1pd7OH-0000Th-6O; Fri, 17 Mar 2023 10:32:53 +0000 Received: by outflank-mailman (output) from mailman id 510990.789633; Fri, 17 Mar 2023 10:32:53 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pd7OH-0000Ta-3X; Fri, 17 Mar 2023 10:32:53 +0000 Received: by outflank-mailman (input) for mailman id 510990; Fri, 17 Mar 2023 10:32:51 +0000 Received: from se1-gles-sth1-in.inumbo.com ([159.253.27.254] helo=se1-gles-sth1.inumbo.com) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1pd7OD-0000TU-Tz for xen-devel@lists.xenproject.org; Fri, 17 Mar 2023 10:32:51 +0000 Received: from casper.infradead.org (casper.infradead.org [2001:8b0:10b:1236::1]) by se1-gles-sth1.inumbo.com (Halon) with ESMTPS id 0f02f081-c4af-11ed-87f5-c1b5be75604c; Fri, 17 Mar 2023 11:32:47 +0100 (CET) Received: from [2001:8b0:10b:5:7f3:374b:cba9:41d] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pd7O8-00Fmow-6r; Fri, 17 Mar 2023 10:32:44 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 0f02f081-c4af-11ed-87f5-c1b5be75604c 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=kDPlanWKwZv08AwaFQFLPuO66YLdV69hV1ELevR3RYA=; b=QXe9kloOTUCZTCNNHi3LrCNsqx 26z8oRHfaoZSGYp2VFYMMVFxDoUdvw98vQ4lBuHcxlcP8MhMF3ToTzU0WV0yhiCsVH+Gbx9j/gUHN MeBIf2MSuRuIFogmhSZtIpEMGypODsXrFZAJOr9HEZIChKZ9fx9aUvPEHCpG8jg+bbVuHifAOHFMW +f7KbalfVW18RaX/tVHRKAqGEyXQkJ+MmxO27Qv7T1D6GxyGBtJpdejE2p+CS2/PUAz4KbgBxgahp VOcEAZL1hDFZDFItGefsoxUvsRQNjO6ILMxLIwipTr1dDNpXfXgfxXNiEFmfsLiqXjzW70CT2D7VI htv1tg4g==; Message-ID: <16d19b45842d4f98f130c98628932eb2d62ffe72.camel@infradead.org> Subject: [PATCH] Fix PCI hotplug AML From: David Woodhouse To: xen-devel@lists.xenproject.org, Jan Beulich Cc: Paul Durrant Date: Fri, 17 Mar 2023 10:32:43 +0000 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-ToYQqzzVj3ZMqvVxURK6" 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 X-Zoho-Virus-Status: 1 X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZM-MESSAGEID: 1679049221547100001 --=-ToYQqzzVj3ZMqvVxURK6 Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: David Woodhouse The emulated PIIX3 uses a nybble for the status of each PCI function, so the status for e.g. slot 0 functions 0 and 1 respectively can be read as (\_GPE.PH00 & 0x0F), and (\_GPE.PH00 >> 0x04). The AML that Xen gives to a guest gets the operand order for the odd- numbered functions the wrong way round, returning (0x04 >> \_GPE.PH00) instead. As far as I can tell, this was the wrong way round in Xen from the moment that PCI hotplug was first introduced in commit 83d82e6f35a8: + ShiftRight (0x4, \_GPE.PH00, Local1) + Return (Local1) /* IN status as the _STA */ Or maybe there's bizarre AML operand ordering going on there, like Intel's wrong-way-round assembler, and it only broke later when it was changed to being generated? Either way, it's definitely wrong now, and instrumenting a Linux guest shows that it correctly sees _STA being 0x00 in function 0 of an empty slot, but then the loop in acpiphp_glue.c::get_slot_status() goes on to look at function 1 and sees that _STA evaluates to 0x04. Thus reporting an adapter is present in every slot in /sys/bus/pci/slots/* Quite why Linux wants to look for function 1 being physically present when function 0 isn't... I don't want to think about right now. Signed-off-by: David Woodhouse Fixes: 83d82e6f35a8 ("hvmloader: pass-through: multi-function PCI hot-plug") Reviewed-by: Jan Beulich --- Utterly untested in Xen. Tested the same change in a different environment which is using precisely the *same* AML for guest compatibility. diff --git a/tools/libacpi/mk_dsdt.c b/tools/libacpi/mk_dsdt.c index 1176da80ef..1d27809116 100644 --- a/tools/libacpi/mk_dsdt.c +++ b/tools/libacpi/mk_dsdt.c @@ -431,7 +431,7 @@ int main(int argc, char **argv) stmt("Store", "0x89, \\_GPE.DPT2"); } if ( slot & 1 ) - stmt("ShiftRight", "0x4, \\_GPE.PH%02X, Local1", slot & ~1= ); + stmt("ShiftRight", "\\_GPE.PH%02X, 0x04, Local1", slot & ~= 1); else stmt("And", "\\_GPE.PH%02X, 0x0f, Local1", slot & ~1); stmt("Return", "Local1"); /* IN status as the _STA */ --=-ToYQqzzVj3ZMqvVxURK6 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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