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 5586828DCB; Wed, 21 Aug 2024 20:24:52 +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=1724271896; cv=none; b=cXmYb3I/gKXwMF220ntj/7qp4ZmWDv9p8O17wQUiqTAi8p41jbaNKDmP+i8rGMA/XQHWmlv+N4ysw44zJLMrM2/IAfDj9aqEo1lhpkoy086hYVL9pSrjWyO5M6Hz4/GawsJINa00AsGUQWEpvEZZcEIWe9slF/uAgn3SQ6IspRA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724271896; c=relaxed/simple; bh=bJBknqbhsv0cm0j9qN1bBgs72UnL/RS5PcDN7chz2WI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kwLPJeOzZxLXkIkS3wIqLVLdec2rCmvrwBGMMcZemeyjVgw/+nSSRg2ejAa0cGI74zOkht5ehV2d9UTv0tiQiWLwzNvQc4GNDJFhMlYLBtvYNX9WIC/hTN60G5tlZ0Ep1F5L7y+lf/twLR/JQBJdmBB9qNmXNNMR4+iDlufF/Ww= 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=AEO752KQ; 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="AEO752KQ" 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=EMGVB2JBPpNy1lhcUZnR6oAwy2R95bxhu9Et9tlQUEY=; b=AEO752KQe09Q7YHa+gyJvDA4n+ +7glxUoLGdlbiKjyJHob73Z3KOmgn/p7PRHs1ssp4ZphPfWRUa0IfjRqRQ53ZqhyOy2tSfGur/0Qu 7wbmipMAf2kYwkiZAXHXOKADUyj5U0AqeDb1LK0G/1gwcX9aJlshwiSCuKe7CEwSMYa3eewVJ2735 ZrIiDrJEGWlV1spmbb6++UtNki8nEtBSZRYIDKXQ6dr8CBPLlxFeeKzd/m7CEOT+gOlJm95AcLcRB C4Ux7IFChqhJFMpE1v0wwl1szaazdn/yDv8kJ7MsZ6+lSHd6ZmpSNhg2SI1pBChMa2QfRSRP/r5yc NyhUa+pw==; Received: from [2001:8b0:10b:5:74d1:c74:54fa:bb6f] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sgrsn-00000009fkM-3k5o; Wed, 21 Aug 2024 20:24:42 +0000 Message-ID: Subject: Re: [PATCH v2] 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: Wed, 21 Aug 2024 21:24:41 +0100 In-Reply-To: References: <04f67b56610fc0122f44468d6c330eede67b54d9.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-O8lA9tUw82XaNNa27MB5" 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 --=-O8lA9tUw82XaNNa27MB5 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2024-08-20 at 14:44 -0700, Sean Christopherson wrote: >=20 > Please split this into 3 patches: >=20 > =C2=A01. Add range-based GPC retry > =C2=A02. Add the wait mechanism. > =C2=A03. Add the needs_invalidation logic. >=20 > #1 and #2 make sense to me, but I'm struggling to understanding why #3 is= needed. > KVM absolutely must not touch the memory after .invalidate_range_start(),= so I > don't see what is gained by deferring invalidation to invalidate_range_en= d(). Hm, I can't see how to do that without the ->needs_invalidation part, so I've put that on its own as the first patch. But I *can* put the patch which moves the invalidation to the 'end' hook last. I very much dislike what is now patch 2 of the series. It's much more complex than it needs to be, and I think the fourth patch is a worthwhile cleanup. David Woodhouse (4): KVM: pfncache: Add needs_invalidation flag to gfn_to_pfn_cache KVM: pfncache: Implement range-based invalidation check for hva_to_pf= n_retry() KVM: pfncache: Wait for pending invalidations instead of spinning KVM: pfncache: Move invalidation to invalidate_range_end hook Sean Christopherson (1): DO NOT MERGE: Hack-a-test to verify gpc invalidation+refresh --=-O8lA9tUw82XaNNa27MB5 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG 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