From: Paolo Bonzini <pbonzini@redhat.com>
To: Sergio Lopez <slp@redhat.com>
Cc: qemu-devel@nongnu.org, mst@redhat.com, imammedo@redhat.com,
marcel.apfelbaum@gmail.com, rth@twiddle.net, ehabkost@redhat.com,
philmd@redhat.com, lersek@redhat.com, kraxel@redhat.com,
mtosatti@redhat.com, kvm@vger.kernel.org
Subject: Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type
Date: Thu, 26 Sep 2019 10:58:35 +0200 [thread overview]
Message-ID: <92575de9-da44-cac4-5b3d-6b07a7a8ea34@redhat.com> (raw)
In-Reply-To: <87o8z737am.fsf@redhat.com>
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On 26/09/19 08:23, Sergio Lopez wrote:
>
> There's still one problem. If the Guest doesn't have TSC_DEADLINE_TIME,
> Linux hangs on APIC timer calibration. I'm looking for a way to work
> around this. Worst case scenario, we can check for that feature and add
> both PIC and PIT if is missing.
>
Huh, that's a silly thing that Linux is doing! If KVM is in use, the
LAPIC timer frequency is known to be 1 GHz.
arch/x86/kernel/kvm.c can just set
lapic_timer_period = 1000000000 / HZ;
and that should disabled LAPIC calibration if TSC deadline is absent.
Paolo
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WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Sergio Lopez <slp@redhat.com>
Cc: ehabkost@redhat.com, kvm@vger.kernel.org, mst@redhat.com,
lersek@redhat.com, mtosatti@redhat.com, qemu-devel@nongnu.org,
kraxel@redhat.com, imammedo@redhat.com, philmd@redhat.com,
rth@twiddle.net
Subject: Re: [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type
Date: Thu, 26 Sep 2019 10:58:35 +0200 [thread overview]
Message-ID: <92575de9-da44-cac4-5b3d-6b07a7a8ea34@redhat.com> (raw)
In-Reply-To: <87o8z737am.fsf@redhat.com>
[-- Attachment #1.1: Type: text/plain, Size: 587 bytes --]
On 26/09/19 08:23, Sergio Lopez wrote:
>
> There's still one problem. If the Guest doesn't have TSC_DEADLINE_TIME,
> Linux hangs on APIC timer calibration. I'm looking for a way to work
> around this. Worst case scenario, we can check for that feature and add
> both PIC and PIT if is missing.
>
Huh, that's a silly thing that Linux is doing! If KVM is in use, the
LAPIC timer frequency is known to be 1 GHz.
arch/x86/kernel/kvm.c can just set
lapic_timer_period = 1000000000 / HZ;
and that should disabled LAPIC calibration if TSC deadline is absent.
Paolo
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next prev parent reply other threads:[~2019-09-26 8:58 UTC|newest]
Thread overview: 133+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-24 12:44 [PATCH v4 0/8] Introduce the microvm machine type Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 12:44 ` [PATCH v4 1/8] hw/i386: Factorize PVH related functions Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 13:18 ` Philippe Mathieu-Daudé
2019-09-24 13:18 ` Philippe Mathieu-Daudé
2019-09-25 6:03 ` Sergio Lopez
2019-09-25 6:03 ` Sergio Lopez
2019-09-25 8:36 ` Stefano Garzarella
2019-09-25 8:36 ` Stefano Garzarella
2019-09-25 9:00 ` Sergio Lopez
2019-09-25 9:00 ` Sergio Lopez
2019-09-25 9:29 ` Stefano Garzarella
2019-09-25 9:29 ` Stefano Garzarella
2019-09-24 12:44 ` [PATCH v4 2/8] hw/i386: Factorize e820 " Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 13:20 ` Philippe Mathieu-Daudé
2019-09-24 13:20 ` Philippe Mathieu-Daudé
2019-09-24 14:12 ` Sergio Lopez
2019-09-24 14:12 ` Sergio Lopez
2019-09-24 12:44 ` [PATCH v4 3/8] hw/virtio: Factorize virtio-mmio headers Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 12:44 ` [PATCH v4 4/8] hw/i386: split PCMachineState deriving X86MachineState from it Sergio Lopez
2019-09-24 13:40 ` Philippe Mathieu-Daudé
2019-09-25 15:39 ` Philippe Mathieu-Daudé
2019-09-24 12:44 ` [PATCH v4 5/8] fw_cfg: add "modify" functions for all types Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 12:44 ` [PATCH v4 6/8] roms: add microvm-bios (qboot) as binary and git submodule Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 13:31 ` Philippe Mathieu-Daudé
2019-09-24 13:31 ` Philippe Mathieu-Daudé
2019-09-25 6:09 ` Sergio Lopez
2019-09-25 6:09 ` Sergio Lopez
2019-09-24 12:44 ` [PATCH v4 7/8] docs/microvm.txt: document the new microvm machine type Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 13:10 ` Paolo Bonzini
2019-09-24 13:10 ` Paolo Bonzini
2019-09-25 5:49 ` Sergio Lopez
2019-09-25 5:49 ` Sergio Lopez
2019-09-25 7:57 ` Paolo Bonzini
2019-09-25 7:57 ` Paolo Bonzini
2019-09-25 8:40 ` Sergio Lopez
2019-09-25 8:40 ` Sergio Lopez
2019-09-25 9:22 ` Paolo Bonzini
2019-09-25 9:22 ` Paolo Bonzini
2019-09-25 11:04 ` Sergio Lopez
2019-09-25 11:04 ` Sergio Lopez
2019-09-25 11:20 ` Paolo Bonzini
2019-09-25 11:20 ` Paolo Bonzini
2019-09-25 15:04 ` Sergio Lopez
2019-09-25 15:04 ` Sergio Lopez
2019-09-25 16:46 ` Paolo Bonzini
2019-09-25 16:46 ` Paolo Bonzini
2019-09-26 6:23 ` Sergio Lopez
2019-09-26 6:23 ` Sergio Lopez
2019-09-26 8:58 ` Paolo Bonzini [this message]
2019-09-26 8:58 ` Paolo Bonzini
2019-09-26 10:16 ` Sergio Lopez
2019-09-26 10:16 ` Sergio Lopez
2019-09-26 10:21 ` Paolo Bonzini
2019-09-26 10:21 ` Paolo Bonzini
2019-09-26 12:12 ` Sergio Lopez
2019-09-26 12:12 ` Sergio Lopez
2019-09-25 5:06 ` Gerd Hoffmann
2019-09-25 5:06 ` Gerd Hoffmann
2019-09-25 7:33 ` Sergio Lopez
2019-09-25 7:33 ` Sergio Lopez
2019-09-25 8:51 ` Gerd Hoffmann
2019-09-25 8:51 ` Gerd Hoffmann
2019-09-24 12:44 ` [PATCH v4 8/8] hw/i386: Introduce the " Sergio Lopez
2019-09-24 12:44 ` Sergio Lopez
2019-09-24 13:12 ` Paolo Bonzini
2019-09-24 13:12 ` Paolo Bonzini
2019-09-24 13:24 ` Michael S. Tsirkin
2019-09-24 13:24 ` Michael S. Tsirkin
2019-09-24 13:34 ` Paolo Bonzini
2019-09-24 13:34 ` Paolo Bonzini
2019-09-25 5:53 ` Sergio Lopez
2019-09-25 5:53 ` Sergio Lopez
2019-09-24 13:28 ` Michael S. Tsirkin
2019-09-24 13:28 ` Michael S. Tsirkin
2019-09-25 5:59 ` Sergio Lopez
2019-09-25 5:59 ` Sergio Lopez
2019-10-01 8:56 ` Sergio Lopez
2019-10-01 8:56 ` Sergio Lopez
2019-09-25 15:40 ` Philippe Mathieu-Daudé
2019-09-25 15:40 ` Philippe Mathieu-Daudé
2019-09-26 6:34 ` Sergio Lopez
2019-09-26 6:34 ` Sergio Lopez
2019-09-26 8:59 ` Paolo Bonzini
2019-09-26 8:59 ` Paolo Bonzini
2019-09-24 13:57 ` [PATCH v4 0/8] " Peter Maydell
2019-09-24 13:57 ` Peter Maydell
2019-09-25 5:51 ` Sergio Lopez
2019-09-25 5:51 ` Sergio Lopez
2019-09-25 11:33 ` Philippe Mathieu-Daudé
2019-09-25 11:33 ` Philippe Mathieu-Daudé
2019-09-25 12:39 ` Peter Maydell
2019-09-25 12:39 ` Peter Maydell
2019-09-25 7:41 ` David Hildenbrand
2019-09-25 7:41 ` David Hildenbrand
2019-09-25 7:58 ` Pankaj Gupta
2019-09-25 7:58 ` Pankaj Gupta
2019-09-25 8:10 ` Sergio Lopez
2019-09-25 8:10 ` Sergio Lopez
2019-09-25 8:16 ` David Hildenbrand
2019-09-25 8:16 ` David Hildenbrand
2019-09-25 8:37 ` Pankaj Gupta
2019-09-25 8:37 ` Pankaj Gupta
2019-09-25 8:26 ` Paolo Bonzini
2019-09-25 8:26 ` Paolo Bonzini
2019-09-25 8:42 ` Sergio Lopez
2019-09-25 8:42 ` Sergio Lopez
2019-09-25 8:44 ` David Hildenbrand
2019-09-25 8:44 ` David Hildenbrand
2019-09-25 10:19 ` when to use virtio (was Re: [PATCH v4 0/8] Introduce the microvm machine type) Paolo Bonzini
2019-09-25 10:19 ` Paolo Bonzini
2019-09-25 10:50 ` David Hildenbrand
2019-09-25 10:50 ` David Hildenbrand
2019-09-25 11:24 ` Paolo Bonzini
2019-09-25 11:24 ` Paolo Bonzini
2019-09-25 11:32 ` David Hildenbrand
2019-09-25 11:32 ` David Hildenbrand
2019-09-25 9:12 ` [PATCH v4 0/8] Introduce the microvm machine type Gerd Hoffmann
2019-09-25 9:12 ` Gerd Hoffmann
2019-09-25 9:29 ` Paolo Bonzini
2019-09-25 9:29 ` Paolo Bonzini
2019-09-25 9:47 ` David Hildenbrand
2019-09-25 9:47 ` David Hildenbrand
2019-09-26 7:48 ` Christian Borntraeger
2019-09-26 7:48 ` Christian Borntraeger
2019-09-26 8:22 ` Sergio Lopez
2019-09-26 8:22 ` Sergio Lopez
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