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 33D3663A7; Wed, 31 Jan 2024 16:34:29 +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=1706718872; cv=none; b=jVGjfHpHYstn7w9R89fpPBuzYCQpZksJPIwrBdklcQiSfTM6hOtCyPS/erY+o08HhvAdT5WfZxxCpSN1DJNVf38UDUShFzI0TS5OHy+iQ0MOFX8Re/xjAWcu/GXHsYwZ9CEhIcUGJaX7MBBSxWWYiO+dquXqBSNvDAF7XcPXX0g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706718872; c=relaxed/simple; bh=p+9BDB3tfGrAuMjx9z8N0dU+nT47L329pmPgaQqnrOQ=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=GaDG9CoYkH/IEa0mKJke3Fy41Ai9Y90lp8/nVj7d2sK+XOGg8auxTGazjJlzv9KXElfFh0eOD36m21iPFVYikJXgrbjBN2g3uKfolz1of/WaCXCgA7bg5lx62cfyXD+rSP25zeh4XYtoz7OvlLEZ8vG59T7NUrrcjGdYFOmdLc0= 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=Z8soV5T+; 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="Z8soV5T+" 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=8QeY9hkXhXXWgkrG/9ywkh8znvMFdPxJx/4GDjlcD0A=; b=Z8soV5T+XxJYHu0Xv+sxcS5CdS +IopC9YLPvLOgF2Zuq50O6aR/ZaAYuS8eFYRzGf+UeQG9V3kP251oKR4Unb6YlUuwR1pjAQ+oquEp JLeMkeS9Iz1bJP4JLWHf4gh0VG1+dPZwjWjc+NJHY9zO2MGUKibAAYGosq1/piTPbNsrSxKJw5wX3 3a2IjecWUPB9T7WjTuo95N8yeuH7SVjM/BzRB1L08O1uJ3jTgKU6q/umfYd2EYXxCXMJK4EvrOt8Q HbDxad5YVlXTGX1ByD+O5F87BaNlwP42arLPVjX3FwE7xkpi5kWfTcY/PANJzOn8w5AFYB1A3b2DV oMmkeNiw==; Received: from [205.251.233.53] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1rVDXa-0000000DLIf-22LS; Wed, 31 Jan 2024 16:34:24 +0000 Message-ID: <596b2d7ce6941e5dd6bd7b2da6d3ea7d74f6c95a.camel@infradead.org> Subject: Re: [PATCH] KVM: selftests: Compare wall time from xen shinfo against KVM_GET_CLOCK From: David Woodhouse To: Vitaly Kuznetsov , kvm@vger.kernel.org, Paolo Bonzini , Sean Christopherson Cc: Jan Richter , linux-kernel@vger.kernel.org Date: Wed, 31 Jan 2024 08:34:18 -0800 In-Reply-To: <20240111135901.1785096-1-vkuznets@redhat.com> References: <20240111135901.1785096-1-vkuznets@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-+4sHBkGNlFmqBWK35EVZ" 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 --=-+4sHBkGNlFmqBWK35EVZ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Sorry for delayed response. On Thu, 2024-01-11 at 14:59 +0100, Vitaly Kuznetsov wrote: >=20 > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 vm_ioctl(vm, KVM_GET_CLOCK, &kcdata= ); > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 delta =3D (wc->sec * NSEC_PER_SEC += wc->nsec) - (kcdata.realtime - kcdata.clock); I think you need to check for KVM_CLOCK_REALTIME in the flags here, don't you? It might not always be set. And also, nobody should ever be using KVM_CLOCK_REALTIME as it stands at the moment. It's fundamentally broken because it should always have used CLOCK_TAI not CLOCK_REALTIME. I'm in the process of fixing that up as an incremental ABI change, putting the TAI offset into one of the spare pad fields in the kvm_clock_data and adding a new KVM_CLOCK_TAI_OFFSET flag. > + TEST_ASSERT(llabs(delta) < 100, > + "Guest's epoch from shinfo %d.%09d differs from KVM_G= ET_CLOCK %lld.%lld", > + wc->sec, wc->nsec, (kcdata.realtime - kcdata.clock) /= NSEC_PER_SEC, > + (kcdata.realtime - kcdata.clock) % NSEC_PER_SEC); >=20 > Replace the check with comparing wall clock data from shinfo to > KVM_GET_CLOCK. The later gives both realtime and kvmclock so guest's epoc= h > can be calculated by subtraction. Note, the computed epoch may still diff= er > a few nanoseconds from shinfo as different TSC is used and there are > rounding errors but 100 nanoseconds margin should be enough to cover > it (famous last words). Aren't those just bugs? Surely this *should* be cycle-perfect, if the host has a stable TSC? But I suppose this isn't the test case for that. This is just testing that the Xen shinfo is doing basically the right thing. And we're going to need a few more fixes like this WIP before we get get to cycle perfection from the horrid mess that is our kvmclock code: https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dcommitdiff;h=3Dbc5= 57e5ee4 --=-+4sHBkGNlFmqBWK35EVZ 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 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