From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44703C433FE for ; Mon, 14 Nov 2022 17:37:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236928AbiKNRgg (ORCPT ); Mon, 14 Nov 2022 12:36:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39484 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237855AbiKNRga (ORCPT ); Mon, 14 Nov 2022 12:36:30 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 78E69DFE9; Mon, 14 Nov 2022 09:36:28 -0800 (PST) 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=ksgv6Kw4v5TEWhEkSQdZRXW2PsFsQyYCc02bWY0gFA0=; b=LZgzetV6GwJwJDe1nd6cAGWu0q Yd8f//0t4coxj6obqiffxxUBxxZd/wlsG6fxeWUjjKimFYn8kGcH5hGoMxYmxrAKTgoYjGUeBOM66 HcQcTNVBfO5KiO7yzV9xYHWJ6TZLKg0uOq894FhQhorkdLd1C8/FcCvsL/bXXhC/ukK0nry6Pk/SF SAPZ6RS9oC58rCsFjFfyqN5mX2arvXV1pfkS82BRCed7RwCi0dMjIB+bB7pViLypNsgnWR11yZJpg NMRpc+XN/OS/qKojLUGMwBhs1wNKKXBNofk4qvf229VBNSeSDAb+G8t2RnQF+T06X0D0yuZ1913HS NOCGPDkw==; Received: from [205.251.233.234] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1oudNi-00FbrO-Cu; Mon, 14 Nov 2022 17:36:27 +0000 Message-ID: Subject: Re: [EXTERNAL][PATCH 03/16] KVM: x86: set gfn-to-pfn cache length consistently with VM word size From: David Woodhouse To: Sean Christopherson Cc: "pbonzini@redhat.com" , "mhal@rbox.co" , "kvm@vger.kernel.org" , "Durrant, Paul" , "linux-kernel@vger.kernel.org" , "Kaya, Metin" Date: Mon, 14 Nov 2022 09:36:14 -0800 In-Reply-To: References: <20221027161849.2989332-1-pbonzini@redhat.com> <20221027161849.2989332-4-pbonzini@redhat.com> <994314051112513787cc4bd0c7d2694e15190d0f.camel@amazon.co.uk> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-xV9e+/arMUMTQw/NOxnB" User-Agent: Evolution 3.36.5-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-xV9e+/arMUMTQw/NOxnB Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2022-11-14 at 16:33 +0000, Sean Christopherson wrote: > On Mon, Nov 14, 2022, Woodhouse, David wrote: > > Most other data structures, including the pvclock info (both Xen and > > native KVM), could potentially cross page boundaries. And isn't that > > also true for things that we'd want to use the GPC for in nesting? >=20 > Off the top of my head, no. Except for MSR and I/O permission bitmaps, w= hich > are >4KiB, things that are referenced by physical address are <=3D4KiB an= d must be > naturally aligned. nVMX does temporarily map L1's MSR bitmap, but that c= ould be > split into two separate mappings if necessary. >=20 > > For the runstate info I suggested reverting commit a795cd43c5b5 but > > that doesn't actually work because it still has the same problem. Even > > the gfn-to-hva cache still only really works for a single page, and > > things like kvm_write_guest_offset_cached() will fall back to using > > kvm_write_guest() in the case where it crosses a page boundary. > >=20 > > I'm wondering if the better fix is to allow the GPC to map more than > > one page. >=20 > I agree that KVM should drop the "no page splits" restriction, but I don'= t think > that would necessarily solve all KVM Xen issues. KVM still needs to prec= isely > handle the "correct" struct size, e.g. if one of the structs is placed at= the very > end of the page such that the smaller compat version doesn't split a page= but the > 64-bit version does. I think we can be more explicit that the guest 'long' mode shall never change while anything is mapped. Xen automatically detects that a guest is in 64-bit mode very early on, either in the first 'fill the hypercall page' MSR write, or when setting HVM_PARAM_CALLBACK_IRQ to configure interrupt routing. Strictly speaking, a guest could put itself into 32-bit mode and set HVM_PARAM_CALLBACK_IRQ *again*. Xen would only update the wallclock time in that case, and makes no attempt to convert anything else. I don't think we need to replicate that. On kexec/soft reset it could go back to 32-bit mode, but the soft reset unmaps everything so that's OK. I looked at making the GPC handle multiple pages but can't see how to sanely do it for the IOMEM case. vmap() takes a list of *pages* not PFNs, and memremap_pages() is... overly complex. But if we can reduce it to *just* the runstate info that potentially needs >1 page, then we can probably handle that with using two GPC (or maybe GHC) caches for it.=20 --=-xV9e+/arMUMTQw/NOxnB 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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