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 C49BF1CAB3; Fri, 2 Aug 2024 08:22:05 +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=1722586928; cv=none; b=RDIMv2+0eXFrOvT10KxBkEk6Ey7J6bZqZz9ZpACPNO7sRBCq/pGMGYYtX6JI18B7vk94vYy2ODLsdq8fAlFHOioRLOdG6Si2kDNrp4C+KoErC4PZimnFqJ1jGbgd/PrMAta7PWMvqOErYyh+OEQazeWG5SzK9iKEjQsEvylfxMU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722586928; c=relaxed/simple; bh=SWEQWD4ugcpKjp64Oh0ixEaK7T6WuL7MBHuZx20SFKY=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=hslccyZF4y9MNdlGx0pNcth12dC+ZbD5B3Z1XyBrzm+jZHVVO48oUQaOH5bCof22NeIAau9I4F24Dh3OijtJoXP+hfn8p3GuNwE92MQah/L8Su5TPiNLsxNjCOdZ4clvceyUleLR5gWXquVDoqIFyq8mdVLk98raihdqevAVGUc= 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=pyytnpPe; 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="pyytnpPe" 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:To:From:Subject:Message-ID:Sender:Reply-To:Cc: Content-Transfer-Encoding:Content-ID:Content-Description; bh=SWEQWD4ugcpKjp64Oh0ixEaK7T6WuL7MBHuZx20SFKY=; b=pyytnpPeUW7eQmuNR8Iku1ZCVv m5oNcb9ynGE9d57nP1VhIdds+r9Oi3edfVyxdduwvT3+2fEGppzoHZzTptDnk0L0uH+kXoMsRiEcM CiwCiKau/7mGiWRyUeNUNywOuHdChas/K5DDS8EnlrRrfp2nt3VA+WqHyiyhrb+otrjEuDikIIExU iQ9ejsz83YXWVlhUASj7FfWnez0AbZ+PALRkLSDFJxJGNroTMxZQyC0vmwr9LGH4bEPEnG7/OKRTk CEJfkzZkS60ni2M9KP0nX4m93VFdQr9bp+8lvyY1EEiNMkwW53vtn8iOqrnnF3UmQLtZU7NvGuFog OStzfB2A==; Received: from [2001:8b0:10b:5:9c27:6796:c1af:9131] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZnXr-00000000oBW-2s8X; Fri, 02 Aug 2024 08:21:52 +0000 Message-ID: <30eb7680b3c7ae5370dfbf7510e664181f38b80e.camel@infradead.org> Subject: Re: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown From: David Woodhouse To: Thomas Gleixner , Michael Kelley , "lirongqing@baidu.com" , "seanjc@google.com" , "kys@microsoft.com" , "haiyangz@microsoft.com" , "wei.liu@kernel.org" , "decui@microsoft.com" , "mingo@redhat.com" , "bp@alien8.de" , "dave.hansen@linux.intel.com" , "x86@kernel.org" , "linux-hyperv@vger.kernel.org" , "linux-kernel@vger.kernel.org" Date: Fri, 02 Aug 2024 09:21:51 +0100 In-Reply-To: <87o76c2hw2.ffs@tglx> References: <1675732476-14401-1-git-send-email-lirongqing@baidu.com> <87ttg42uju.ffs@tglx> <87o76c2hw2.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-4CSCRaYGchRhReR6T79l" User-Agent: Evolution 3.44.4-0ubuntu2 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 --=-4CSCRaYGchRhReR6T79l Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-08-01 at 20:54 +0200, Thomas Gleixner wrote: > On Thu, Aug 01 2024 at 16:14, Michael Kelley wrote: > > From: Thomas Gleixner Sent: Thursday, August > > 1, 2024 7:21 AM > > FWIW, in Hyper-V guests with the Hyper-V quirk removed, tglx's new > > sequence does *not* stop the PIT. But this sequence does: > >=20 > > outb_p(0x30, PIT_MODE); > > outb_p(0xff, PIT_CH0); > > outb_p(0xff, PIT_CH0); > >=20 > > outb_p(0x30, PIT_MODE); > > outb_p(0xff, PIT_CH0); >=20 > That works on bare metal too What about writing *just* the MODE? The datasheet definitely seems to be saying that should work too. And I believe it works on Hyper-V; that's what the "workaround" has been doing, because Hyper-V actually got it right. > > I don't have a convenient way to test my sequence on KVM. >=20 > But still fails in KVM By KVM you mean the in-kernel one that we want to kill because everyone should be using userspace IRQ chips these days? I don't know that we care; the failure mode is basically harmless so let's just let it get fixed in KVM rather than pandering to it? --=-4CSCRaYGchRhReR6T79l 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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