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 89059C4332F for ; Thu, 9 Nov 2023 10:02:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231752AbjKIKCp (ORCPT ); Thu, 9 Nov 2023 05:02:45 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58206 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229936AbjKIKCo (ORCPT ); Thu, 9 Nov 2023 05:02:44 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BCB1E2D64; Thu, 9 Nov 2023 02:02:41 -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=rlKqmmB/MxFBzhJyP8ZpIvTDCmIyyN/VdPB4YNKlA7o=; b=HzNFKXCE0wzvoZRaQLQfhMgOE5 l7MexzR7s8WeVjDokVE+jApArcEFD+CrH2MgkoktAK38m7xe0/I1251hja7Hl1Lct2cm2Sx6RLmK4 vdjZlKuZnGOvhC+txTYw5kx0j/f7X1U4vIiGUw4NAgjO7p4bOzSlcrIOpblByg2Cqd+YutxFRWFPy LLJ3CencaVP3B5PJWrFC6D54DiFFrfWVQgPYCd8PhQaS2qqfIStVeDeWngBYng77OAyD/2KXbv/3x 4z5CLZSc4DU+Tfe9bom3eEHwwTCRBP0XnxdFxx7YhPxP6VBaB9jK9Q6s8dGib4Anwk4vJvECJW4+O lHaDQkWg==; Received: from [2001:8b0:10b:5:e60c:fbc4:6b73:8eff] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1r11rv-006aPD-Qj; Thu, 09 Nov 2023 10:02:37 +0000 Message-ID: <117d1e78e7277177236dabc616ade178fdc336fa.camel@infradead.org> Subject: Re: [PATCH v7 00/11] KVM: xen: update shared_info and vcpu_info handling From: David Woodhouse To: paul@xen.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Paul Durrant , "H. Peter Anvin" , Borislav Petkov , Dave Hansen , Ingo Molnar , Paolo Bonzini , Sean Christopherson , Thomas Gleixner , x86@kernel.org Date: Thu, 09 Nov 2023 10:02:35 +0000 In-Reply-To: References: <20231002095740.1472907-1-paul@xen.org> <6629b7f0b56e0fb2bad575a1d598cce26b1c6432.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-dXORg12ccy0XlqFZOb05" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-dXORg12ccy0XlqFZOb05 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-10-05 at 09:36 +0100, Paul Durrant wrote: > On 05/10/2023 07:41, David Woodhouse wrote: > > On Mon, 2023-10-02 at 09:57 +0000, Paul Durrant wrote: > > > From: Paul Durrant > > >=20 > > > The following text from the original cover letter still serves as an > > > introduction to the series: > > >=20 > > > "Currently we treat the shared_info page as guest memory and the VMM > > > informs KVM of its location using a GFN. However it is not guest memo= ry as > > > such; it's an overlay page. So we pointlessly invalidate and re-cache= a > > > mapping to the *same page* of memory every time the guest requests th= at > > > shared_info be mapped into its address space. Let's avoid doing that = by > > > modifying the pfncache code to allow activation using a fixed userspa= ce HVA > > > as well as a GPA." > > >=20 > > > This version of the series is functionally the same as version 6. I h= ave > > > simply added David Woodhouse's R-b to patch 11 to indicate that he ha= s > > > now fully reviewed the series. > >=20 > > Thanks. I believe Sean is probably waiting for us to stop going back > > and forth, and for the dust to settle. So for the record: I think I'm > > done heckling and this is ready to go in. > >=20 > > Are you doing the QEMU patches or am I? > >=20 >=20 > I'll do the QEMU changes, once the patches hit kvm/next. Note that I disabled migration support in QEMU for emulated Xen guests.=C2=A0You might want that for testing, since the reason for this wor= k is to enable pause/serialize workflows. Migration does work all the way up to XenStore itself, and https://gitlab.com/qemu-project/qemu/-/commit/766804b101d *was* tested with migration enabled. There are also unit tests for XenStore serialize/deserialize. I disabled it because the PV backends on the XenBus don't have suspend/resume support. But a guest using other emulated net/disk devices should still be able to suspend/resume OK if we just remove the 'unmigratable' flag from xen_xenstore, I believe.=20 --=-dXORg12ccy0XlqFZOb05 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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