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 B1A1A1E4A6; Thu, 1 Aug 2024 19:21:38 +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=1722540101; cv=none; b=GzP0WFTzvWVolv9W9xMgJY7LkCNifdw726BhOtWl/y/telZu6cpjEEHwVb42ZKkIksYHSisQ+uhHPunkUcCUEjNTCUF9H02yfV75yVA15yRGZUSSiEga9kzcV3QjgArolaJVmcHW9K1mVR4b2EzCSwwHulloeAmWDIUYeUjOmuY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722540101; c=relaxed/simple; bh=MC4192yMctMPd1yBG0n1svPKbc8RISIa1apXQRjHazI=; h=Message-ID:Subject:From:To:Date:In-Reply-To:References: Content-Type:MIME-Version; b=MxYcEbMWib34nAPokVg8y6TVlSJrbryHEJ1YYH3x+Hmmai1V3dX+8KWLGDvAjp3B8l4E6ZcuIjoq+aai8R7vXSqqdUnGxLkTBmvxZFM1SfV1EJ9aLIaFhvEPhJbzNk+mP3hVSB2SOWNXqR1uzjLLnBEz9kdfd2rQPG1K1u+kIvM= 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=p6f0dTxp; 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="p6f0dTxp" 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=MC4192yMctMPd1yBG0n1svPKbc8RISIa1apXQRjHazI=; b=p6f0dTxp9xmJJtCoildHECkBGD ZBAEx9/9sD/SDyJXZ135d9eH2ewTkpIqQsJcX+Ag3A5WHzYWUv1Oel7u7MZuYWotdYmwnSLX2tw9p gC5kU+kaDyNppYuZcQz8Pskv0aIrgHz7f7WT+u1fFB4noDYkl/WuihSEh0vg1wrKt2AhcYaXTYot2 zvTdh+KEFrfMzP+oSDzwn2aBI61WKmRAsoDEkQKCMvozpsjWzO0qnlAdmFKBEOsn7O8jJCNsHcGW6 Y3fntPgG4H6D7fiTa0f56Zs5ZPgLVDmyI7OQwjBr9R8eHpDia798R3su6ZPkixO19K/zJ9k2G33PO 0FtrVxpQ==; 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 1sZbMa-00000000DCD-2vTb; Thu, 01 Aug 2024 19:21:24 +0000 Message-ID: Subject: Re: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown From: David Woodhouse To: Thomas Gleixner , 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: Thu, 01 Aug 2024 20:21:23 +0100 In-Reply-To: <87ikwk2hcs.ffs@tglx> References: <1675732476-14401-1-git-send-email-lirongqing@baidu.com> <87ttg42uju.ffs@tglx> <87ikwk2hcs.ffs@tglx> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-i4yXVvz2Se1i3HXGRjKf" 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 --=-i4yXVvz2Se1i3HXGRjKf Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-08-01 at 21:06 +0200, Thomas Gleixner wrote: > On Thu, Aug 01 2024 at 18:49, David Woodhouse wrote: > > On Thu, 2024-08-01 at 16:21 +0200, Thomas Gleixner wrote: > > > The stop sequence is wrong: > > >=20 > > > =C2=A0=C2=A0=C2=A0 When there is a count in progress, writing a new L= SB before the > > > =C2=A0=C2=A0=C2=A0 counter has counted down to 0 and rolled over to F= FFFh, WILL stop > > > =C2=A0=C2=A0=C2=A0 the counter.=C2=A0 However, if the LSB is loaded A= FTER the counter has > > > =C2=A0=C2=A0=C2=A0 rolled over to FFFFh, so that an MSB now exists in= the counter, then > > > =C2=A0=C2=A0=C2=A0 the counter WILL NOT stop. > > >=20 > > > The original i8253 datasheet says: > > >=20 > > > =C2=A0=C2=A0=C2=A0 1) Write 1st byte stops the current counting > > > =C2=A0=C2=A0=C2=A0 2) Write 2nd byte starts the new count > >=20 > > It says that for mode zero ("Interrupt on Terminal Count"), yes. But in > > that mode, shouldn't the IRQ only fire *one* more time anyway, rather > > than repeatedly? That should be OK, shouldn't it? > >=20 > > "When terminal count is reached, the output will go high and remain > > high until the selected count register is reloaded wityh the mode or a > > new count is loaded". >=20 > I just confirmed that this is the case on KVM. >=20 > > It's OK for it to keep *counting* as long as it stops firing > > interrupts, isn't it? >=20 > Yes. So the sequence should stop KVM from trying to inject > interrupts. Maybe someone fixes it to actually stop fiddling with the > counter too :) I don't think we care about the counter value, as that's *calculated* on demand when the guest tries to read from it. Or, more to the point, *if* the guest tries to read from it. As opposed to the interrupt, which is a timer in the VMM which takes a CPU out of guest mode and incurs steal time, just to waggle a pin on the emulated PICs for no good reason. > > Either way, this is somewhat orthogonal to the patch I posted in=20 > > https://lore.kernel.org/kvm/6cd62b5058e11a6262cb2e798cc85cc5daead3b1.ca= mel@infradead.org/T/#u > > for the fact that we don't shut down the PIT at *all* if we aren't ever > > going to use it. > >=20 > > I'm glad I decided to export a function from the clocksource driver and > > just *call* it from pit_timer_init() though. Means we can bikeshed the > > shutdown sequence in *one* place and it isn't duplicated. >=20 > Right. Though we don't have to make this conditional on hypervisor I > think. Right, we don't *have* to. I vacillated about that and almost ripped it out before sending the patch, but came down on the side of "hardware is a steaming pile of crap and if I don't *have* to change its behaviour, let's not touch it". I justify my cowardice on the basis that it doesn't *matter* if a hardware implementation is still toggling the IRQ pin; in that case it's only a few irrelevant transistors which are busy, and it doesn't translate to steal time. --=-i4yXVvz2Se1i3HXGRjKf 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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