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From: Thomas Gleixner <tglx@linutronix.de>
To: Michael Kelley <mhklinux@outlook.com>,
	"lirongqing@baidu.com" <lirongqing@baidu.com>,
	"seanjc@google.com" <seanjc@google.com>,
	"kys@microsoft.com" <kys@microsoft.com>,
	"haiyangz@microsoft.com" <haiyangz@microsoft.com>,
	"wei.liu@kernel.org" <wei.liu@kernel.org>,
	"decui@microsoft.com" <decui@microsoft.com>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"bp@alien8.de" <bp@alien8.de>,
	"dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown
Date: Thu, 01 Aug 2024 20:54:37 +0200	[thread overview]
Message-ID: <87o76c2hw2.ffs@tglx> (raw)
In-Reply-To: <SN6PR02MB41571AE611E7D249DABFE56DD4B22@SN6PR02MB4157.namprd02.prod.outlook.com>

On Thu, Aug 01 2024 at 16:14, Michael Kelley wrote:
> From: Thomas Gleixner <tglx@linutronix.de> 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:
>
> outb_p(0x30, PIT_MODE);
> outb_p(0xff, PIT_CH0);
> outb_p(0xff, PIT_CH0);
>
> outb_p(0x30, PIT_MODE);
> outb_p(0xff, PIT_CH0);

That works on bare metal too

> I don't have a convenient way to test my sequence on KVM.

But still fails in KVM

Thanks,

        tglx

  reply	other threads:[~2024-08-01 18:54 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-02-07  1:14 [PATCH] clockevents/drivers/i8253: Do not zero timer counter in shutdown lirongqing
2023-02-08  1:04 ` Michael Kelley (LINUX)
2023-02-08 15:04   ` Sean Christopherson
2023-02-24  9:45     ` Li,Rongqing
     [not found]     ` <3b8496c071214bda9e5ecfa048f18ab9@baidu.com>
2023-04-13  1:28       ` Wei Liu
     [not found]       ` <1311175816673.202304.ZDdawTGHoa/UH20U@liuwe-devbox-debian-v2>
2023-04-14  5:17         ` Li,Rongqing
2024-08-01  9:00   ` David Woodhouse
2024-08-01 15:22     ` David Woodhouse
2024-08-01 21:07       ` Thomas Gleixner
2024-08-01 21:10         ` David Woodhouse
2024-08-01 14:21 ` Thomas Gleixner
2024-08-01 16:14   ` Michael Kelley
2024-08-01 18:54     ` Thomas Gleixner [this message]
2024-08-02  8:21       ` David Woodhouse
2024-08-02 14:55         ` Sean Christopherson
2024-08-02 15:04           ` David Woodhouse
2024-08-12 23:59             ` Sean Christopherson
2024-08-13  6:39               ` David Woodhouse
2024-08-01 17:49   ` David Woodhouse
2024-08-01 18:25     ` David Woodhouse
2024-08-01 18:57       ` Thomas Gleixner
2024-08-02  8:07         ` David Woodhouse
2024-08-02 10:49           ` Thomas Gleixner
2024-08-02 11:04             ` David Woodhouse
2024-08-02 13:27               ` Thomas Gleixner
2024-08-02 13:46                 ` David Woodhouse
2024-08-01 19:06     ` Thomas Gleixner
2024-08-01 19:21       ` David Woodhouse
2024-08-01 20:00         ` Thomas Gleixner
2024-08-01 20:49           ` David Woodhouse
2024-08-01 21:22             ` Thomas Gleixner
2024-08-01 21:31               ` David Woodhouse
2024-08-02  9:55                 ` David Woodhouse

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