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 70F03BA3D; Sat, 8 Aug 2026 15:05:41 +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=1786201542; cv=none; b=LDr5dzzr1LFTkaH7eA5TLV+I6VBG5AbRgjNIymmWgfJf206o/7q78tIFFKcKAmnt6gqZFBDKShcqn869u8ZHw4RMxR9tiAOwrsQF5SDb3bzsuUQvsNcTpfTe2GoxY00r6CL0FAlAoDQ8QeRxin5mB0KuLJTwSpJiekAfkGHMswo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786201542; c=relaxed/simple; bh=ooQqkTBP2aw581qnakN5t2SCd2AjIQSVpOqD3UV1JgI=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=S3SwTZlEI6SaBuJujBSvT+VQ75VKHaF58WBJxt31T50TFuIXa4DG/swOvcpvWx5loJOC5l0BNPddZxaiKrll3hxwWxBOV0j1siv4q+nrP09ccZSyAD+LfwRzlU3LZL91n1h00Pr7cEQTdfVQ8OwasxvIpiyDJM1Lk8/Qt+vIboM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=hlYPBpot; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="hlYPBpot" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:In-Reply-To: Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:References; bh=k+OamkYrv2Q/1Mc6CsMtTvPptfqZvc3HFc+EwxszCfc=; b=hlYPBpotHaB95aCGdAYb8rWrKG KNI9+ZVShJ4Ay6zxwsOUpNJWjPvdGkEG9NwAn5zoMv/eGYSvR8AsXsfffEJnoQQKlLgd8Qnqa+OuU mNBgEL6qPs8Sy5mGvzbmNMGWGa5UTCuk+md58+H01r5jM5AK1pWT0DaOtuNRDOHr73p7f1P0IZ0M+ o7WyiBkfKf5TLyq50c7Vf+G/sgGEej2IoI5tPmWAxAiqI0RBo5N6/54mpQLYJZRAVwIPTw6oNahu9 5zcqtF1+uci6tRLFYlZNAc25hy+I4btFu/um7mbNPifcJ2HzQC9bkx4VrQuxV6KOmh0d9aHxfdQv7 GcrajjZA==; Received: from [54.239.6.187] (helo=u09cd745991455d.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.99.1 #2 (Red Hat Linux)) id 1wsicA-00000006ZIm-2rcE; Sat, 08 Aug 2026 15:05:34 +0000 Message-ID: <91c9ca8c1ab7f3facc12fd7a033d79254d4a181d.camel@infradead.org> Subject: Re: [PATCH v6 19/51] x86/kvmclock: Drop dead check on TSC being unstable during kvmclock_init() From: David Woodhouse To: seanjc@google.com Cc: kas@kernel.org, rick.p.edgecombe@intel.com, pbonzini@redhat.com, kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, longli@microsoft.com, ajay.kaher@broadcom.com, alexey.makhalov@broadcom.com, jan.kiszka@siemens.com, dave.hansen@linux.intel.com, luto@kernel.org, peterz@infradead.org, jgross@suse.com, daniel.lezcano@kernel.org, tglx@kernel.org, jstultz@google.com, x86@kernel.org, linux-coco@lists.linux.dev, kvm@vger.kernel.org, linux-hyperv@vger.kernel.org, virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org Date: Sat, 08 Aug 2026 16:05:33 +0100 In-Reply-To: <20260806233609.212337-20-seanjc@google.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-jL4BIGsiNKeXF0OKBwg7" User-Agent: Evolution 3.60.3-0ubuntu1~ppa9~24.04 Precedence: bulk X-Mailing-List: linux-hyperv@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 --=-jL4BIGsiNKeXF0OKBwg7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-08-06 at 16:35 -0700, Sean Christopherson wrote: > As pointed out by Sashiko[*], kvmclock_init() runs before __setup() and > thus before notsc_setup() or tsc_setup() can mark the TSC unstable. > kvmclock_init() also runs well before tsc_init(), and even before > tsc_early_init(). Simply delete the check, as it's been dead code since > it was introduced. > > Note, odds are good the check_tsc_unstable() call was copied from Xen's > xen_time_init()+xen_tsc_safe_clocksource() logic (as so much of KVM's PV > code was). However, xen_time_init() runs via x86_init.timers.timer_init(= ), > which is invoke from x86_late_time_init(), and thus after params have bee= n > parsed. > > Alternatively, kvmclock could register itself later on, or tsc_setup() > could be parsed as an early param. Given that there's zero evidence ther= e > was any meaningful intent or need to actually check for an unstable TSC, > go with the simplest option. > > Fixes: 7539b174aef4 ("x86: kvmguest: use TSC clocksource if invariant TSC= is exposed") > Link: https://lore.kernel.org/all/20260529181213.0B27A1F00893@smtp.kernel= .org [*] > Signed-off-by: Sean Christopherson Reviewed-by: David Woodhouse --=-jL4BIGsiNKeXF0OKBwg7 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCE8Ew ggWvMIIEl6ADAgECAhANkOKMSmGXhF5eMl0rsRhvMA0GCSqGSIb3DQEBDAUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBHMjAeFw0yNDAzMTMwMDAwMDBaFw0zNDAz MTIyMzU5NTlaMGIxCzAJBgNVBAYTAlVTMRcwFQYDVQQKEw5EaWdpQ2VydCwgSW5jLjE6MDgGA1UE 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