From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1FE081F9416; Fri, 3 Jan 2025 14:47:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735915640; cv=none; b=qYoqYWsCaBYgpCtsy5KLgLWn73cLKzdV+6EEx6bSI8U4bSyN/zqpOgDfDCUhenG7rF+GwJQj3UmpQc16LsGwQVg9fyizg/9s2+MHdt+8ubL6Oqe3PL/TaaLaYMb2klJwqkRNxyvKRybEq6mKwwmQ2+x9qqvoqxjbKDeemuRU6p0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735915640; c=relaxed/simple; bh=mUcKDApUsz/36WpOxwM/l8srfKHHx/NnKl5aBYtkSXM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kUTsLDvElJLSFewEt9ZRscXpjA3eCbaBmr7ytNfhgeprtG0ve+pqNLqDJny6UjT//gcOyCuzNtqFj1Sb7iSI1/wzpIL22XA0XDyAV7cwd1OiX/3UbQiKOo800YKUqUyoSg1spekmdU/IKCc+hQLlBrWzXxft0s6IflhjBuL5GQE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=casper.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=DHoAfqPP; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=casper.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="DHoAfqPP" 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=mUcKDApUsz/36WpOxwM/l8srfKHHx/NnKl5aBYtkSXM=; b=DHoAfqPPdkszZBsxbMo0uKisYN FMF+dvHceY2v6zLhRU6hCCU9ZFdL+pKq4xwwbbL+r9n7C4ndCjQqQ7LKqHBTGECZSXXUPEkFgf3sL yGHqdNs/rCqyGzvc7n9BXlkVJOaKhATB16m3QjsInFU22FmucR1D2IJH0sbWDG6YfTPKYin0A0WrX sME4is1Zup+wEv/lLPSKgMgrzmMc7QuLWq38YpWILPhb7CGg7TucGM36K/jQANl9cZE1R149RSbB7 lYsC7RXyy95L5qKPECc21FZgeVToHLL4/Gq1NoY4jCplHRiDWXjD39SithS5aiKBNliLWeCs6ZAtn 4uZxT5EA==; Received: from 54-240-197-232.amazon.com ([54.240.197.232] helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.98 #2 (Red Hat Linux)) id 1tTixE-000000068Yl-3hKG; Fri, 03 Jan 2025 14:47:13 +0000 Message-ID: <432d4304b579c5bd6973628c3c4aaad476627f7b.camel@infradead.org> Subject: Re: [PATCH RFC/RFT] vfio/pci: Create feature to disable MSI virtualization From: David Woodhouse To: Jason Gunthorpe Cc: Thomas Gleixner , Alex Williamson , kvm@vger.kernel.org, quic_bqiang@quicinc.com, kvalo@kernel.org, prestwoj@gmail.com, linux-wireless@vger.kernel.org, ath11k@lists.infradead.org, iommu@lists.linux.dev, kernel@quicinc.com, johannes@sipsolutions.net, jtornosm@redhat.com Date: Fri, 03 Jan 2025 14:47:11 +0000 In-Reply-To: <20250103143138.GC26854@ziepe.ca> References: <20240812170014.1583783-1-alex.williamson@redhat.com> <20240813163053.GK1985367@ziepe.ca> <87r0aspby6.ffs@tglx> <03fdfde8dc05ecce1f1edececf0800d8cb919ac1.camel@infradead.org> <20250103143138.GC26854@ziepe.ca> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-f/2fc+N2t1dgAOO+0chU" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: linux-wireless@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html --=-f/2fc+N2t1dgAOO+0chU Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-01-03 at 10:31 -0400, Jason Gunthorpe wrote: >=20 > IIRC Alex had a patch series for qemu to capture and rewrite the ath > non-standard MSI locations, so virtualization worries should not block > moving ath to use the device-specific MSI.. In the absence of the IOMMU in our shared fantasy, this seems like the best approach. Even for passed-through PCI hardware, the config space is largely a fiction. As are the MSI(-X) vectors. So although it's a device-specific quirk, this seems like the best approach. Probably best for the hypervisor to have some way to *advertise* that it's handling this though, as guests also might want to run on hypervisors which don't. --=-f/2fc+N2t1dgAOO+0chU Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 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