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 1D63715920E; Thu, 22 Aug 2024 09:01:04 +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=1724317270; cv=none; b=rsY5NVSWMGuI0N0CbvAQfYRUktkrRMD2M9kt9ohgTCJxyT93EKB4bVdZpdaCVS9q47pj4UPri6XD8/kJ3ppEVd4Q0HuqzKd+PPKKijg84GuLheJDvXRVU/bhNuQNC6iY06INbq7JgIyTTv32UPNjLtWNRUwNAQtqofVIHQD7VAM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724317270; c=relaxed/simple; bh=XGPDz/MPSnu01/3I7h/L8S7oRaaz8eZcP9k3C7XWEfY=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=OYWYqtnA0ZVP+97byU7HdMfwlq/3kuJ+WumA18Dlinu6YdvPBXZBVRcoxsQBQmHX62m0xWX516uknQ2pgGXQ4N3TQCCWuxRsTVd50FR111xHK46BCrx246UG27h0DO/yryiodNM+iQ216KRq6CcrDd87UJN86Rxcph0CJE/cb8g= 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=XI4fu03/; 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="XI4fu03/" 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=XGPDz/MPSnu01/3I7h/L8S7oRaaz8eZcP9k3C7XWEfY=; b=XI4fu03/m2v/e8+EN865SsMoMX lrdSv3yf6/UBgcI/g+Up2hQJsqpLGKoLKlE4/AYpGdVLDYATjTARFbq09E0t4af1NI/q04PBkiuCU zciLgdCnj6yUJ27RqTu1iXnFlF15LynkEHYsJ9wNWf9csBPA41eXJRzotOEFHBSIXmxIa8G5aKZ4k L54tKg7GDM98D4hVYGNtpB54f///UhJQAtLYoviOu5Np+KBfNdIyQAhuyi/yo6q79jK38NNpcvslU 2T50a+F8r5KXmzOCqwwUdzfy4QHXTmX6KpUHngE9YxHcakrM/30jg66XC3HXgVFo30/VswOoihUes 0n5yDoRQ==; Received: from [2001:8b0:10b:5:bebd:4b39:e979:6fb2] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sh3gY-0000000AJzh-0LzF; Thu, 22 Aug 2024 09:00:50 +0000 Message-ID: <592b598ecd3a8cf7188750d20582899d03489230.camel@infradead.org> Subject: Re: [PATCH] KVM: Move gfn_to_pfn_cache invalidation to invalidate_range_end hook From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , Mushahid Hussain , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Mingwei Zhang , Maxim Levitsky Date: Thu, 22 Aug 2024 10:00:49 +0100 In-Reply-To: References: <20220427014004.1992589-1-seanjc@google.com> <20220427014004.1992589-7-seanjc@google.com> <294c8c437c2e48b318b8c27eb7467430dfcba92b.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-h2BpiiB2WJsTy5PYKBwk" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-h2BpiiB2WJsTy5PYKBwk Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-08-06 at 07:03 -0700, Sean Christopherson wrote: > On Tue, Aug 06, 2024, David Woodhouse wrote: > > On Mon, 2024-08-05 at 17:45 -0700, Sean Christopherson wrote: > > > On Mon, Aug 05, 2024, David Woodhouse wrote: > > > > From: David Woodhouse > > > Servicing guest pages faults has the same problem, which is why > > > mmu_invalidate_retry_gfn() was added.=C2=A0 Supporting hva-only GPCs = made our lives a > > > little harder, but not horrifically so (there are ordering difference= s regardless). > > >=20 > > > Woefully incomplete, but I think this is the gist of what you want: > >=20 > > Hm, maybe. It does mean that migration occurring all through memory > > (indeed, just one at top and bottom of guest memory space) would > > perturb GPCs which remain present. >=20 > If that happens with a real world VMM, and it's not a blatant VMM goof, t= hen we > can fix KVM.=C2=A0 The stage-2 page fault path hammers the mmu_notifier r= etry logic > far more than GPCs, so if a range-based check is inadequate for some use = case, > then we definitely need to fix both. FWIW this turned out to be because someone used C++ where they shouldn't have done. Opinion is divided on whether to call that a 'blatant VMM goof'. But if you use std::vector for something that's modified that many times a second, and free() implicitly calls madvise(MADV_DONTNEED) every time, you get what you deserve :) We should still fix it in the kernel. --=-h2BpiiB2WJsTy5PYKBwk 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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