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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id BB33AC4708C for ; Tue, 6 Dec 2022 01:11:16 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1p2MTi-0007f5-K5; Mon, 05 Dec 2022 20:10:35 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p2MTa-0007eh-Rr for qemu-devel@nongnu.org; Mon, 05 Dec 2022 20:10:26 -0500 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1p2MTW-0006H3-Vu for qemu-devel@nongnu.org; Mon, 05 Dec 2022 20:10:26 -0500 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=wLswx5yOyVv8RWpUJXKukXEF12ETcgowDHsuUTxI3YQ=; b=UehXM39OGva1PljOf7vMXYuyG9 StkNqqnhBzywQwqlop8duCk48j2zy1QFhK6It/ndvF10eWuQUCwHYOO6gu12dQ9mhTJsmpuq6zysm s/+62ZDkQajTKUfkghznZDfmSblbXVmes8uW8I/j2iPaA4UR+BDco6ZNY2DHYwVGLNZSzPP4AxLjy Qs+eou4ikZShF+NYPxLAUXPNl+CO2st3pDJhFSKBIpkU/IFYPUuGZlOf1jNBca+1+fqMDI1I4VjWi mrZXUsdylc7cZqxs97jkWC4Q1eU8bF/aHmLZTmP42wLCdSXS7WZhR1upm63EaV5uqbyN9eAqWEWdi cA35nSrQ==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.infradead.org) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1p2MTX-003sVT-UJ; Tue, 06 Dec 2022 01:10:24 +0000 Message-ID: Subject: Re: [RFC PATCH 10/21] i386/xen: handle guest hypercalls From: David Woodhouse To: Philippe =?ISO-8859-1?Q?Mathieu-Daud=E9?= , qemu-devel@nongnu.org Cc: Paolo Bonzini , Paul Durrant , Joao Martins , Ankur Arora Date: Tue, 06 Dec 2022 01:10:15 +0000 In-Reply-To: References: <20221205173137.607044-1-dwmw2@infradead.org> <20221205173137.607044-11-dwmw2@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-kWo6Zx4ZPJI3vdTX9c2F" 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 Received-SPF: none client-ip=2001:8b0:10b:1236::1; envelope-from=BATV+eadd4843470e5bcc0eee+7044+infradead.org+dwmw2@casper.srs.infradead.org; helo=casper.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-kWo6Zx4ZPJI3vdTX9c2F Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2022-12-05 at 23:11 +0100, Philippe Mathieu-Daud=C3=A9 wrote: > On 5/12/22 18:31, David Woodhouse wrote: > > From: Joao Martins > >=20 > > This means handling the new exit reason for Xen but still > > crashing on purpose. As we implement each of the hypercalls > > we will then return the right return code. > >=20 > > Signed-off-by: Joao Martins > > [dwmw2: Add CPL to hypercall tracing, disallow hypercalls from CPL > 0] > > Signed-off-by: David Woodhouse > > --- > > target/i386/kvm/kvm.c | 5 +++++ > > target/i386/trace-events | 3 +++ > > target/i386/xen.c | 45 +++++++++++++++++++++++++++++++++++++++= + > > target/i386/xen.h | 1 + > > 4 files changed, 54 insertions(+) > >=20 > > diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c > > index 4b21d03250..6396d11f1e 100644 > > --- a/target/i386/kvm/kvm.c > > +++ b/target/i386/kvm/kvm.c > > @@ -5468,6 +5468,11 @@ int kvm_arch_handle_exit(CPUState *cs, struct kv= m_run *run) > > assert(run->msr.reason =3D=3D KVM_MSR_EXIT_REASON_FILTER); > > ret =3D kvm_handle_wrmsr(cpu, run); > > break; > > +#ifdef CONFIG_XEN >=20 > CONFIG_XEN is set when the _host_ has Xen development files available. >=20 > IIUC here you want to check if Xen HVM guest support is enabled. >=20 > You might want to use a different CONFIG_XEN_xxx key, which itself > depends on CONFIG_XEN. Yeah, I'd be interested in opinions on that one. Strictly, the only one that *needs* to be a configure option is CONFIG_XEN for the Xen libraries, which is support for actually running on Xen. Any time KVM is present, we *could* pull in the rest of the xenfv machine support unconditionally, since that's no longer dependent on true Xen. But because there's a non-trivial amount of code in the event channel and grant table stuff, *perhaps* we want to make it optional? I don't really want to call that CONFIG_KVM_XEN since as noted, it's theoretically possible to do it with TCG or other accelerators too. So we could call it CONFIG_XEN_EMULATION. I don't think we'd make that depend on CONFIG_XEN though, since none of the actual Xen libraries would be needed once everything's implemented and cleaned up. So things like the xenfv machine code would then depend on (CONFIG_XEN || CONFIG_XEN_EMULATION)... or we could make a new automatic config symbol CONFIG_XEN_MACHINE which has the same effect? Happy to do it however seems best. --=-kWo6Zx4ZPJI3vdTX9c2F 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 AQEAyjztlApB/975Rrno1jvm2pK/KxBOqhq8gr2+JhwpKirSzZxQgT9tlC7zl6hn1fXjSo5MqXUf ItMltrMaXqcESJuK8dtK56NCSrq4iDKaKq9NxOXFmqXX2zN8HHGjQ2b2Xv0v1L5Nk1MQPKA19xeW 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