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 712092D8767; Thu, 20 Aug 2026 22:45:45 +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=1787265951; cv=none; b=tdXHV7hVxVuWRJkPo+kqP0730eK8s59HYEeOaO1U7N5zQqozsc3/Kl0zPxtocOOUUrmZxAx7tutOCC/aO0DXlLAB4854Ybo+n9f3alDGRT7k8MvYM2nYl56/5dH+FPzfLFXsBQYrrmv4YT1u9QmVqVo+pMF1m62baO09GS9KFPE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787265951; c=relaxed/simple; bh=dfhPT3LaXJDKCDZyVloxM6WbVlp5oRl8wZBrc1kjz9c=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=rCe/GGJSxLNRVxJCSLLWiA2TGWC8RJ5BKvN5DKl3fdHUQnEc6FariqZIx69Twr3vIpfxKfnSeru41Y5PY3W+HYUbdN6fTGh31efoAq46gHZuks2mSAWp68bZUJgUpN3A6KA+kyQDxhaTuB88QjTx77JOwuvF6BQH5DuzFvEGLWg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=Rxl+g9IG; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="Rxl+g9IG" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:References; bh=ma+puGXlwAFXJ/5re6dRBX/c+rL0Ibt5BTE5FkmmbE0=; b=Rxl+g9IGlSdLsruLkFwBxUBXsw 1sIU3bfnS7u5TOBHwdBgWrIMb6OtDV1NWSwn9K++j8QluI4X/aPewleREzJCcCwaEO6aCSjoMax7j zAqz8SzLuTt2X8g0REtLIVdmR+dhNZxd3hfIz4H0RW2+AfidfwL0/WgtMwGrxa5XTeYhqPCwm//lw yGtkX8iLfwFB2+W7i1FE19yyEsfy2h6FYNkHaHCLvI35LShxlK9dK8hR61WC3uOttByr+NrQLS2tW h1VrxTGYFAdRgG3dGFitmF3n0CX0FbXcbRG0w8/4ZVqO3xCcgGC7/Lpt8LW+PRhHBJnLaXFqiuUbP wO+FJj4g==; Received: from [2001:8b0:10b:5:1f55:b76d:f266:856d] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wxBW2-0000000GQ0E-2FLx; Thu, 20 Aug 2026 22:45:42 +0000 Message-ID: Subject: Re: [PATCH v4 00/10] KVM: nVMX: Improve performance for unmanaged guest memory From: David Woodhouse To: Fred Griffoul Cc: Sean Christopherson , kvm@vger.kernel.org, pbonzini@redhat.com, vkuznets@redhat.com, shuah@kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 20 Aug 2026 23:45:29 +0100 In-Reply-To: <9a349470088e5f71a136b00dfada97fdb2528d98.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-/S7kIaGz6jctB7m1mCV/" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-kernel@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 --=-/S7kIaGz6jctB7m1mCV/ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2026-08-17 at 22:55 +0100, David Woodhouse wrote: > I've reworked the first half of this on top of the GPC SRCU > conversion, with the guest-mode pinning done as Sean prescribed: >=20 > https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dshortlog;h=3Dr= efs/heads/nvmx-gpc I did the nested SVM equivalent too, now on top of the same tree: https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dshortlog;h=3Dref= s/heads/nsvm-gpc (Those kvm_nested_gpc_lock() helpers have nothing to do with nesting and can be renamed and hoisted to somewhere more generic when I go back and clean it all up, but I'm keeping it incremental for now.) SVM doesn't use L1 pages directly from the guest VMCB02 (the merged MSRPM and the IOPM are kernel pages). It's only ever direct access from the kernel to gpc->khva. But that covers the VMCB12 page which is mapped and unmapped twice per L1=E2=86=90=E2=86=92L2 round trip today, and L1's MSR/IO permission bitmaps (kvm_vcpu_read_guest() on each trapped access). So unlike nVMX, we can even see the win on boring non-PFNMAP memory. =46rom a cpuid ping-pong between L1 and L2 on EPYC Milan (10k iterations, cycles, measured from L1): baseline nsvm-gpc reflected exit: p50 47.6k p99 90.2k p50 38.6k p99 81.4k MSR intercept: p50 49.1k p99 90.9k p50 39.9k p99 81.8k About 9k cycles (~20%) off every emulated vmexit/vmentry. This is a kernel with KASAN+lockdep for correctness torture testing, so the measurement might not be indicative of production performance. I'll do another run on something more representative now it's actually passed the soak tests without catching fire. --=-/S7kIaGz6jctB7m1mCV/ Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE AxMxRGlnaUNlcnQgQXNzdXJlZCBHMiBTTUlNRSBSU0E0MDk2IFNIQTM4NCAyMDI0IENBMTCCAiIw DQYJKoZIhvcNAQEBBQADggIPADCCAgoCggIBAOfSIeC0vv1xPQ+dgSxbIIrkaru6skAWJYaGFzmv q4Kq+2wU2jxhcWlJg/JeP5jEkq/LM3pn5aaLao79j+XRmS7J1ZpJKUODJVoM4s9MQJhTMvo4qS5Z S64g6QR7Obkz3I1Lr3aWeSBmDDEyzue+NKtuWZ1Cxy3RdXo/w5HgRc3l2AercOM3Gt1XonTzEtTb 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