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 34FFBC433FE for ; Mon, 14 Nov 2022 22:24:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237367AbiKNWYs (ORCPT ); Mon, 14 Nov 2022 17:24:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237266AbiKNWYp (ORCPT ); Mon, 14 Nov 2022 17:24:45 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 582DF17E28; Mon, 14 Nov 2022 14:24:40 -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=5zvK4A/3b3sb4CLf5RZydU6DNS9ZjkNiDzZm6RENhIc=; b=OMYZGsmUt+liz9HAuSBKl8M2TZ bMAUenEkBY249GcxJDtWxLyigyV0uX0oS+OLilugs67xokCPzUx6I54daWAKw7h4Z33k0DMfp9uYE YhvtQnc2a/zlhnMp61DzpLrbeI+wY3wvDVmBUVJRqdek14s+JZsRmVay76TiInF3Qn7zZ/t5CY3Hb 9D99sYB/ZaS2Ljzt5YMTYdncVIhhefG7nyubsCTteTs36UJton49SuSalT67c6j2ziQrDZD9Fh1aW QhGyezEdwwcBoyFVrDLHtAXiMjdDdNUm39Sk0EvX6q5QkCvx5VBzqipA0rzlwcGByo1uYJ8I3yBCS f8Kv5LgQ==; Received: from [205.251.233.106] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1ouhsf-00FpUP-6F; Mon, 14 Nov 2022 22:24:41 +0000 Message-ID: Subject: Re: [PATCH] KVM: x86/xen: Make number of event channels defines less magical From: David Woodhouse To: Sean Christopherson Cc: Paolo Bonzini , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Paul Durrant Date: Mon, 14 Nov 2022 14:24:32 -0800 In-Reply-To: References: <20221114181632.3279119-1-seanjc@google.com> <629d6d90ce95b9db74f0101a4428be1119c4bfc7.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-w1Qxjn7ruFH1U2x8yMNo" 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 --=-w1Qxjn7ruFH1U2x8yMNo Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2022-11-14 at 19:39 +0000, Sean Christopherson wrote: > Ugh. I worried that might be the case. An alternative approach to help = document > things from a KVM perspective would be something like: >=20 > diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c > index 93c628d3e3a9..7769f3b98af0 100644 > --- a/arch/x86/kvm/xen.c > +++ b/arch/x86/kvm/xen.c > @@ -1300,6 +1300,9 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu) > =20 > static inline int max_evtchn_port(struct kvm *kvm) > { > + BUILD_BUG_ON(EVTCHN_2L_NR_CHANNELS !=3D > + (sizeof_field(struct shared_info, evtchn_pending) * = BITS_PER_BYTE)); > + > if (IS_ENABLED(CONFIG_64BIT) && kvm->arch.xen.long_mode) > return EVTCHN_2L_NR_CHANNELS; > else Not really sure I see the point of that. There are two main reasons for that kind of BUILD_BUG_ON(). I've added a few of them asserting that the size of the structure and its compat variant are identical, and thus documenting *why* the code lacks compat handling. For example... /* * Next, write the new runstate. This is in the *same* place * for 32-bit and 64-bit guests, asserted here for paranoia. */ BUILD_BUG_ON(offsetof(struct vcpu_runstate_info, state) !=3D offsetof(struct compat_vcpu_runstate_info, state)); The second reason is to prevent accidental screwups where our local definition of a structure varies from the official ABI. Like these: /* Paranoia checks on the 32-bit struct layout */ BUILD_BUG_ON(offsetof(struct compat_shared_info, wc) !=3D 0x900); BUILD_BUG_ON(offsetof(struct compat_shared_info, arch.wc_sec_hi) !=3D 0x92= 4); BUILD_BUG_ON(offsetof(struct pvclock_vcpu_time_info, version) !=3D 0); I don't really see the above fulfilling either of those use cases. Given that the definition of the evtchn_pending field is: xen_ulong_t evtchn_pending[sizeof(xen_ulong_t) * 8]; It's fairly tautological that the number of event channels supported is BITS_PER_ULONG * BITS_PER_ULONG. Which is sizeof(xen_ulong_t)=C2=B2 * 64 as defined in the official Xen headers. I don't know that we really need to add our own sanity check on the headers we imported from Xen. It doesn't seem to add much. No objection to cleaning up the COMPAT one though, as in your original patch. --=-w1Qxjn7ruFH1U2x8yMNo 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 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