From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 810022033A; Fri, 18 Apr 2025 13:01:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744981315; cv=none; b=jdFAG9nsGHetC1pQSFX5BdgbRRUptXeAUx5SWJ7habXLHWgx7EeM7Ue8Tk6f7mVqdwK+IxzIZRRDbGwDVY4PxiXvh+ti3/FEeuZOkMHQw2Cy3MkqiEJllU6Q6qkqKgEWTPyp1FSL6boFJjWsYASYU8IWm6H2g9d35J/r0uAck1A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744981315; c=relaxed/simple; bh=9qXaQQn1Ey9oYmnZ8wUyQPUBMdtFi+KBXC1tO2W511A=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=gaNQuwZNNYtTg/QXlcMid2upLKxoioUGh7RRNMIr+hDdDmSLRon4z+bCc4JMDnro+h2ZJI+rn+srsNVdeFZFWIbCrgI7BgY5QqnqOcj8bLpQOC+fCSBaYsLfk3O9xg9G5sDNoIUrvZJJUfyRElkDSNLsnhq/thx2aOuPjZN5+fY= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=Jt+IMejR; arc=none smtp.client-ip=90.155.92.199 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=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Jt+IMejR" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=9qXaQQn1Ey9oYmnZ8wUyQPUBMdtFi+KBXC1tO2W511A=; b=Jt+IMejRgvLq5is1dMCJ5qjcCK zjqQ0o4hJCpg+B9Kkx7sfykD1QShFdKlzvo36DFVhew42qZ6Nhl59Kt0eI7p8g5RLuPKLfi63Qxl4 fac2HcfbmgX3gVpff45YtZeQDPmVmez6RV5Lsv/JiHXXVqP2JHumnFItp85bxeMSa5hzl5cUv6V7T P0ElcVq48/5ICpkxWHlAf3RHJeypWQCIBtQvYKRQsBO4JqfyYh8hTi6ddiaHzbSDzfYkdGAtNSCTx DSqyuDF5zbRYD3EYjuC0saM5XmwtV0OoBvm3F5Sq7Ew7UNq9LPc8S5eJIOWtEXLkaT0PqZSYUnb38 kVxrQz/Q==; Received: from [172.31.31.140] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98.1 #2 (Red Hat Linux)) id 1u5lLl-0000000AW2W-3UA7; Fri, 18 Apr 2025 13:01:46 +0000 Message-ID: <6f070686a44225d36bc1086dc1643841b3d43d19.camel@infradead.org> Subject: Re: [PATCH 00/67] KVM: iommu: Overhaul device posted IRQs support From: David Woodhouse To: Sean Christopherson , Paolo Bonzini , Joerg Roedel , Lu Baolu Cc: kvm@vger.kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, Maxim Levitsky , Joao Martins , David Matlack Date: Fri, 18 Apr 2025 14:01:45 +0100 In-Reply-To: <20250404193923.1413163-1-seanjc@google.com> References: <20250404193923.1413163-1-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-MFZG0bDXQqmhZab3DPFx" User-Agent: Evolution 3.52.3-0ubuntu1 Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-MFZG0bDXQqmhZab3DPFx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2025-04-04 at 12:38 -0700, Sean Christopherson wrote: >=20 > This series is well tested except for one notable gap: I was not able to > fully test the AMD IOMMU changes.=C2=A0 Long story short, getting upstrea= m > kernels into our full test environments is practically infeasible.=C2=A0 = And > exposing a device or VF on systems that are available to developers is a > bit of a mess. If I can make AMD bare-metal "instances" available to you, would that help? Separately, I'd quite like to see the eventfd=E2=86=92MSI delivery linkage = not use the IRQ routing table at all, and not need a GSI# assigned. Doing it that way is just a scaling and performance issue. I recently looked through the irqfd code and came to the conclusion that it wouldn't be hard to add a new user API which allows us to simply configure the kvm_irq_routing_entry to be delivered when a given eventfd fires, without using the table. I haven't had a chance to look hard, hopefully your rework doesn't make that any less feasible... --=-MFZG0bDXQqmhZab3DPFx 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 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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