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 47D5C4437A; Thu, 1 Aug 2024 09:00:46 +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=1722502852; cv=none; b=F7YIoctR5fAhoKyRsn593FmIUDcNMuHQBRI1MvhXCPVSlKY1BCPpDKq57ThbwCfyIgR1Mzuo9YZtB3HWQ0KS7ttKVdilNb+R1DgHG8rg6bQekC6MPHHxxApraLW67EaP6ETN/FoxRnz5GA31o22iAhXS5MDUjzeZXgEAaMHaEFo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722502852; c=relaxed/simple; bh=3s9bBsgTAU2bXXhtdSTBbryq/yUt/J1j0Lu1yFD7bmk=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:Content-Type: MIME-Version; b=kV4WkMoVqnOv2lFEWOgRAL7w0xK4wq5phddE/LiypyyV/vtvdBP69kztNTcmHQxKjRp489Oprk9SH1k4cC5m79qIHH7gTVTci949V6AkMUZ+8L9RHjr/27lEpWRfBcNZXvqygbn3hyOru3Vyc5Z7bgqYj1V5rm/GZmZkc8nNlWw= 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=rN96ZUJw; 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="rN96ZUJw" 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=8hfcPICnBsNv/yuQvKebBQf0lEmbzShpjtZjQbyOjJg=; b=rN96ZUJwucGGp3PlH5PEPPiusQ xdQlVxZjmXVYwekKFcmAECqzym8KdI5MkLhqrTYzogYSaoFLCSYQAaELh8yYP/Gk9B2MQ/HSqlS+q GTr9I6HPA0eWRri3q+eKntjydHsPkTIMomLCiWkwY6/9idtLdTkFKQwO11QlTA3wWfh64dg1K9w1y YtmCJmufu13m5YxGF2RdST3nRu5jjcNDHSyVK/LCPW/CcsU9Uewh6paQB1TwrtHGInAwVHZ8ecPMx JHxQjh67Rjwfcy2693TJyhYjqvD658L65nmSHmRvfZRizftc07UiSTvpK/Fkj6qYL3nz5EvkTqGY0 CEIokw0Q==; Received: from [2001:8b0:10b:5:6bc8:e78:2c4f:f682] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZRfr-0000000HE6q-0iBN; Thu, 01 Aug 2024 09:00:39 +0000 Message-ID: <8eb7ba99a746110597bbac6f1e027aa63384dfce.camel@infradead.org> Subject: RE: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown From: David Woodhouse To: mikelley@microsoft.com, kvm Cc: bp@alien8.de, dave.hansen@linux.intel.com, decui@microsoft.com, haiyangz@microsoft.com, kys@microsoft.com, linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org, lirongqing@baidu.com, mingo@redhat.com, seanjc@google.com, tglx@linutronix.de, wei.liu@kernel.org, x86@kernel.org Date: Thu, 01 Aug 2024 10:00:38 +0100 In-Reply-To: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-9I9Kx6CSGSmWpqPUh/db" 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 --=-9I9Kx6CSGSmWpqPUh/db Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On 2023-02-08 at 01:04:19 +0000, "Michael Kelley (LINUX)" said: > From: lirongqing@baidu.com Sent: Monday, February = 6, 2023 5:15 PM > >=20 > > Zeroing the counter register in pit_shutdown() isn't actually supposed = to > > stop it from counting, will causes the PIT to start running again, > > From the spec: > >=20 > > The largest possible initial count is 0; this is equivalent to 216 fo= r > > binary counting and 104 for BCD counting. > >=20 > > The Counter does not stop when it reaches zero. In Modes 0, 1, 4, and= 5 the > > Counter "wraps around" to the highest count, either FFFF hex for bina= ry > > count- ing or 9999 for BCD counting, and continues counting. > >=20 > > Mode 0 is typically used for event counting. After the Control Word i= s > > written, OUT is initially low, and will remain low until the Counter > > reaches zero. OUT then goes high and remains high until a new count o= r a > > new Mode 0 Control Word is written into the Counter. > >=20 > > Hyper-V and KVM follow the spec, the issue that 35b69a42 "(clockevents/= drivers/ > > i8253: Add support for PIT shutdown quirk") fixed is in i8253 drivers, = not Hyper-v, > > so delete the zero timer counter register in shutdown, and delete PIT s= hutdown > > quirk for Hyper-v >=20 > From the standpoint of Hyper-V, I'm good with this change. But there's a > risk that old hardware might not be compliant with the spec, and needs th= e > zero'ing for some reason. The experts in the x86 space will be in the bes= t > position to assess the risk. At the time, the quirk approach was taken s= o > the change applied only to Hyper-V, and any such risk was avoided. >=20 > For Hyper-V, > Reviewed-by: Michael Kelley It's not entirely clear why we zero it at all. What was it supposed to achieve? I suppose if we want to be ultra-careful, perhaps we could do the zeroing only on real hardware, if hypervisor_is_type(X86_HYPER_NATIVE)? This does seem to be making VMMs spend a bunch of time stealing cycles from the guest to emulate an unwanted timer, so it would be good to fix it. --=-9I9Kx6CSGSmWpqPUh/db 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 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