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 2929113B5AC; Thu, 1 Aug 2024 15:22:46 +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=1722525771; cv=none; b=kKbyG0pGbHpUUcQ4fdd2uikpmXlEUYUgjGoOrzn79waXoYaBUUMHh/8ZhOF+JaaIfo88j0EZcRzD4PiPyNarQ4IYcOI7nwLcDshnQpOIbdunM8GJl0kvc/1Grfc5dzmBuY5gNQqUhS1HmXCfVSbr2fPNgOug5lPYmqB4yyt0eoc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722525771; c=relaxed/simple; bh=MoAwAP99XKXHT49XS0io/ShWTU2wbYLn6ux3Xettcro=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=L9lX+0SiNTcQLGG0E7F8c3UgcBY8P8y5I8Kc5XIFmhfyPNvBlXdn4Kx/T5gIKU9Ut9nqkajvOu0/mxOPt9sMplKVfePEuX/Wdmlf4Cng7BZuQseEkEYdlxmlLkPvz+9XLh7EsOCGmGNWxQTgZzbDlYmAquhVg4YUVs2oYKh57CA= 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=rvj+s2M4; 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="rvj+s2M4" 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=mj8h/k1s5zEM80u6Ti/vtwMW86BbLVDkXUKONBwaWAQ=; b=rvj+s2M4QVsGGcQrx8zHEIXaFx 0RgiauZgWnnsqtkPb7DFglZaW2W9hSH7flAPoEivc+B1Bg7yd6tzcvBcdlxsXpaXfEi2UPUWFqb57 j645qETPpeK1kZx7klmOFTtK6/JIodWQbMwFEosOZzTlnqw1/EyxSaUyix0lFvq7tq+cXapxUq91e rZUf6n4EnWMWHimUk1TsZp+b2ADdjcHesjUXAYI2N0YhBH0skvuppOBVnEKCXsA3NiucTUMzG6C/8 FosxHBZqyooEletK6J2Y60Jc2zNBSD0ZA3COg1WoJQj+gn+n4l0wWwiJTESq4TAKE+LGw1E+vbTlI ACX1bVEg==; 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 1sZXdU-000000000AK-2Uwk; Thu, 01 Aug 2024 15:22:36 +0000 Message-ID: <4bac07dc91de1c45720f36ed6b797d3f215f131a.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 16:22:35 +0100 In-Reply-To: <8eb7ba99a746110597bbac6f1e027aa63384dfce.camel@infradead.org> References: <8eb7ba99a746110597bbac6f1e027aa63384dfce.camel@infradead.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-7AO6vW62NRJyzdN58Qjk" 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 --=-7AO6vW62NRJyzdN58Qjk Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2024-08-01 at 10:00 +0100, David Woodhouse wrote: > >=20 > >=20 > >=20 > > On 2023-02-08 at 01:04:19 +0000, "Michael Kelley (LINUX)" said: > > > > From: lirongqing@baidu.com=C2=A0 Sent: Monday= , February 6, 2023 5:15 PM > > > > > >=20 > > > > > > Zeroing the counter register in pit_shutdown() isn't actually s= upposed to > > > > > > stop it from counting,=C2=A0 will causes the PIT to start runni= ng again, > > > > > > From the spec: > > > > > >=20 > > > > > > =C2=A0 The largest possible initial count is 0; this is equival= ent to 216 for > > > > > > =C2=A0 binary counting and 104 for BCD counting. > > > > > >=20 > > > > > > =C2=A0 The Counter does not stop when it reaches zero. In Modes= 0, 1, 4, and 5 the > > > > > > =C2=A0 Counter "wraps around" to the highest count, either FFFF= hex for binary > > > > > > =C2=A0 count- ing or 9999 for BCD counting, and continues count= ing. > > > > > >=20 > > > > > > =C2=A0 Mode 0 is typically used for event counting. After the C= ontrol Word is > > > > > > =C2=A0 written, OUT is initially low, and will remain low until= the Counter > > > > > > =C2=A0 reaches zero. OUT then goes high and remains high until = a new count or a > > > > > > =C2=A0 new Mode 0 Control Word is written into the Counter. > > > > > >=20 > > > > > > Hyper-V and KVM follow the spec, the issue that 35b69a42 "(cloc= kevents/drivers/ > > > > > > i8253: Add support for PIT shutdown quirk") fixed is in i8253 d= rivers, not Hyper-v, > > > > > > so delete the zero timer counter register in shutdown, and dele= te PIT shutdown > > > > > > quirk for Hyper-v > > > >=20 > > > > From the standpoint of Hyper-V, I'm good with this change.=C2=A0 Bu= t there's a > > > > risk that old hardware might not be compliant with the spec, and ne= eds the > > > > zero'ing for some reason. The experts in the x86 space will be in t= he best > > > > position to assess the risk.=C2=A0 At the time, the quirk approach = was taken so > > > > the change applied only to Hyper-V, and any such risk was avoided. > > > >=20 > > > > For Hyper-V, > > > > Reviewed-by: Michael Kelley > >=20 > > It's not entirely clear why we zero it at all. What was it supposed to > > achieve? Answering my own question here, it seems that *some* implementations don't apply the mode change until the counter is subsequently written. I think QEMU applies it immediately. But the KVM in-kernel one (and the AWS Nitro Hypervisor) do not. So the interrupt doesn't shut up until you write the counter. I don't see any justification for writing the counter causing any more than *one* further interrupt though, in single-shot mode. If that's what Hyper-V does, that seems like a bug (which is worked around already). I do see the VMM wasting a bunch of time emulating a PIT IRQ that goes nowhere, but that seems to be because the bootloader or BIOS turns it on, and nothing in Linux ever turns it back *off* again unless it's registered at boot and then pit_shutdown() is called when we switch to something better. I'll look at an optimisation in the VMM which can stop firing the timer if the PIT IRQ is already masked or pending in the PIC and IOAPIC; that's just a waste of steal time. But the guest kernel should probably do something like this... diff --git a/arch/x86/kernel/i8253.c b/arch/x86/kernel/i8253.c index 2b7999a1a50a..d13fd793254e 100644 --- a/arch/x86/kernel/i8253.c +++ b/arch/x86/kernel/i8253.c @@ -8,6 +8,7 @@ #include #include =20 +#include #include #include #include @@ -39,8 +40,29 @@ static bool __init use_pit(void) =20 bool __init pit_timer_init(void) { - if (!use_pit()) + if (!use_pit()) { + if (!hypervisor_is_type(X86_HYPER_NATIVE)) { + /* + * Don't just ignore the PIT. Ensure it's stopped, + * because VMMs otherwise steal CPU time just to + * pointlessly waggle the (masked) IRQ. + */ + raw_spin_lock(&i8253_lock); + outb_p(0x30, PIT_MODE); + + /* + * It's not entirely clear from the datasheet, but some + * virtual implementations don't stop until the counter + * is actually written. + */ + if (i8253_clear_counter_on_shutdown) { + outb_p(0, PIT_CH0); + outb_p(0, PIT_CH0); + } + raw_spin_unlock(&i8253_lock); + } return false; + } =20 clockevent_i8253_init(true); global_clock_event =3D &i8253_clockevent; >=20 --=-7AO6vW62NRJyzdN58Qjk Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT 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