From: Paolo Bonzini <pbonzini@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Sergio Lopez <slp@redhat.com>,
David Hildenbrand <david@redhat.com>,
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, mtosatti@redhat.com,
kvm@vger.kernel.org, Pankaj Gupta <pagupta@redhat.com>
Subject: Re: [PATCH v4 0/8] Introduce the microvm machine type
Date: Wed, 25 Sep 2019 11:29:51 +0200 [thread overview]
Message-ID: <8fa274c8-6bb7-bf88-7715-bb23f5dfb7de@redhat.com> (raw)
In-Reply-To: <20190925091225.bx4c4x2o6qgydidj@sirius.home.kraxel.org>
On 25/09/19 11:12, Gerd Hoffmann wrote:
> Hi,
>
>> If you want to add hotplug to microvm, you can reuse the existing code
>> for CPU and memory hotplug controllers, and write drivers for them in
>> Linux's drivers/platform. The drivers would basically do what the ACPI
>> AML tells the interpreter to do.
>
> How would the linux kernel detect those devices?
>
> I guess that wouldn't be ACPI, seems everyone wants avoid it[1].
>
> So device tree on x86? Something else?
Yes, device tree would be great.
> [1] Not clear to me why, some minimal ACPI tables listing our
> devices (isa-serial, fw_cfg, ...) doesn't look unreasonable
> to me.
It's not, but ACPI is dog slow and half of the boot time is cut if you
remove it.
> We could also make virtio-mmio discoverable that way.
True, but the simplest way to plumb virtio-mmio into ACPI would be
taking the device tree properties and representing them as _DSD[1]. So
at this point it's just as easy to use directly the device tree.
Paolo
[1]
https://kernel-recipes.org/en/2015/talks/representing-device-tree-peripherals-in-acpi/
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Gerd Hoffmann <kraxel@redhat.com>
Cc: Pankaj Gupta <pagupta@redhat.com>,
mtosatti@redhat.com, ehabkost@redhat.com,
Sergio Lopez <slp@redhat.com>,
mst@redhat.com, lersek@redhat.com,
David Hildenbrand <david@redhat.com>,
qemu-devel@nongnu.org, kvm@vger.kernel.org, imammedo@redhat.com,
philmd@redhat.com, rth@twiddle.net
Subject: Re: [PATCH v4 0/8] Introduce the microvm machine type
Date: Wed, 25 Sep 2019 11:29:51 +0200 [thread overview]
Message-ID: <8fa274c8-6bb7-bf88-7715-bb23f5dfb7de@redhat.com> (raw)
In-Reply-To: <20190925091225.bx4c4x2o6qgydidj@sirius.home.kraxel.org>
On 25/09/19 11:12, Gerd Hoffmann wrote:
> Hi,
>
>> If you want to add hotplug to microvm, you can reuse the existing code
>> for CPU and memory hotplug controllers, and write drivers for them in
>> Linux's drivers/platform. The drivers would basically do what the ACPI
>> AML tells the interpreter to do.
>
> How would the linux kernel detect those devices?
>
> I guess that wouldn't be ACPI, seems everyone wants avoid it[1].
>
> So device tree on x86? Something else?
Yes, device tree would be great.
> [1] Not clear to me why, some minimal ACPI tables listing our
> devices (isa-serial, fw_cfg, ...) doesn't look unreasonable
> to me.
It's not, but ACPI is dog slow and half of the boot time is cut if you
remove it.
> We could also make virtio-mmio discoverable that way.
True, but the simplest way to plumb virtio-mmio into ACPI would be
taking the device tree properties and representing them as _DSD[1]. So
at this point it's just as easy to use directly the device tree.
Paolo
[1]
https://kernel-recipes.org/en/2015/talks/representing-device-tree-peripherals-in-acpi/
next prev parent reply other threads:[~2019-09-25 9:29 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
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 [this message]
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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