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Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio psto
From: |
Namhyung Kim |
Subject: |
Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver |
Date: |
Tue, 15 Nov 2016 23:36:29 +0900 |
User-agent: |
Mutt/1.7.1 (2016-10-04) |
Hi,
On Tue, Nov 15, 2016 at 10:57:29AM +0100, Paolo Bonzini wrote:
>
>
> On 15/11/2016 06:06, Michael S. Tsirkin wrote:
> > On Tue, Nov 15, 2016 at 01:50:21PM +0900, Namhyung Kim wrote:
> >> Hi Michael,
> >>
> >> On Thu, Nov 10, 2016 at 06:39:55PM +0200, Michael S. Tsirkin wrote:
> >>> On Sat, Aug 20, 2016 at 05:07:42PM +0900, Namhyung Kim wrote:
> >>>> The virtio pstore driver provides interface to the pstore subsystem so
> >>>> that the guest kernel's log/dump message can be saved on the host
> >>>> machine. Users can access the log file directly on the host, or on the
> >>>> guest at the next boot using pstore filesystem. It currently deals with
> >>>> kernel log (printk) buffer only, but we can extend it to have other
> >>>> information (like ftrace dump) later.
> >>>>
> >>>> It supports legacy PCI device using single order-2 page buffer.
> >>>
> >>> Do you mean a legacy virtio device? I don't see why
> >>> you would want to support pre-1.0 mode.
> >>> If you drop that, you can drop all cpu_to_virtio things
> >>> and just use __le accessors.
> >>
> >> I was thinking about the kvmtools which lacks 1.0 support AFAIK.
> >
> > Unless kvmtools wants to be left behind it has to go 1.0.
>
> And it also has to go ACPI. Is there any reason, apart from kvmtool, to
> make a completely new virtio device, with no support in existing guests,
> rather than implement ACPI ERST?
Well, I know nothing about ACPI. It looks like a huge spec and I
don't want to dig into it just for this.
What I want is to speed up dumping guest kernel message (especially
for ftrace dump).
Thanks,
Namhyung
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Michael S. Tsirkin, 2016/11/10
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Namhyung Kim, 2016/11/14
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Michael S. Tsirkin, 2016/11/15
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Paolo Bonzini, 2016/11/15
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver,
Namhyung Kim <=
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Paolo Bonzini, 2016/11/15
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Namhyung Kim, 2016/11/16
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Paolo Bonzini, 2016/11/16
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Namhyung Kim, 2016/11/17
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Michael S. Tsirkin, 2016/11/17
- Re: [Qemu-devel] [virtio-dev] Re: [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Paolo Bonzini, 2016/11/18
- Re: [Qemu-devel] [PATCH 1/3] virtio: Basic implementation of virtio pstore driver, Paolo Bonzini, 2016/11/18