From: Sasha Levin <levinsasha928@gmail.com>
To: Matt Evans <matt@ozlabs.org>
Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, penberg@kernel.org,
asias.hejun@gmail.com, gorcunov@gmail.com,
Alexander Graf <agraf@suse.de>
Subject: Re: [PATCH V2 0/2] kvm tools: PPC64 basic support
Date: Wed, 14 Dec 2011 06:35:55 +0000 [thread overview]
Message-ID: <1323844555.3992.13.camel@lappy> (raw)
In-Reply-To: <4EE7EEF8.9090804@ozlabs.org>
On Wed, 2011-12-14 at 11:34 +1100, Matt Evans wrote:
> On 13/12/11 21:23, Sasha Levin wrote:
> > On Tue, 2011-12-13 at 18:00 +1100, Matt Evans wrote:
> >> The second patch is a small fix for generic virtio code (now that we have a
> >> PPC build) which removes reliance on ioeventfds for PPC, which doesn't provide
> >> them.
> >
> > Hm... ioeventfds are located in the generic code and should be available
> > on all archs (it doesn't use any arch specific code at all afaik).
> >
> > Why don't they work on ppc?
> >
>
> Well, there are two problems: you're right that it's generic code, but it's
> configurable and CONFIG_HAVE_KVM_EVENTFD isn't set for PPC KVM (thus the ioctl
> fails). That's probably off because ioevents won't work anyway-- the in-kernel
> MMIO exit route isn't wired up to kvm_io_bus_read/write() yet. (It looks like
> KVM_IRQFD will also fail, which virtio-pci /would/ use if I supported MSIs,
> which I currently don't.)
>
> Yes, this can be fixed, but relying on it means that virtio on kvmtool/PPC won't
> work on today's kernels. :(
In that case, KVM_CAP_IOEVENTFD is simply not set, so we're better off
checking the cap dynamically instead of having it defined statically in
the makefile.
I'll send a short patch that does that.
--
Sasha.
WARNING: multiple messages have this Message-ID (diff)
From: Sasha Levin <levinsasha928@gmail.com>
To: Matt Evans <matt@ozlabs.org>
Cc: kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, penberg@kernel.org,
asias.hejun@gmail.com, gorcunov@gmail.com,
Alexander Graf <agraf@suse.de>
Subject: Re: [PATCH V2 0/2] kvm tools: PPC64 basic support
Date: Wed, 14 Dec 2011 08:35:55 +0200 [thread overview]
Message-ID: <1323844555.3992.13.camel@lappy> (raw)
In-Reply-To: <4EE7EEF8.9090804@ozlabs.org>
On Wed, 2011-12-14 at 11:34 +1100, Matt Evans wrote:
> On 13/12/11 21:23, Sasha Levin wrote:
> > On Tue, 2011-12-13 at 18:00 +1100, Matt Evans wrote:
> >> The second patch is a small fix for generic virtio code (now that we have a
> >> PPC build) which removes reliance on ioeventfds for PPC, which doesn't provide
> >> them.
> >
> > Hm... ioeventfds are located in the generic code and should be available
> > on all archs (it doesn't use any arch specific code at all afaik).
> >
> > Why don't they work on ppc?
> >
>
> Well, there are two problems: you're right that it's generic code, but it's
> configurable and CONFIG_HAVE_KVM_EVENTFD isn't set for PPC KVM (thus the ioctl
> fails). That's probably off because ioevents won't work anyway-- the in-kernel
> MMIO exit route isn't wired up to kvm_io_bus_read/write() yet. (It looks like
> KVM_IRQFD will also fail, which virtio-pci /would/ use if I supported MSIs,
> which I currently don't.)
>
> Yes, this can be fixed, but relying on it means that virtio on kvmtool/PPC won't
> work on today's kernels. :(
In that case, KVM_CAP_IOEVENTFD is simply not set, so we're better off
checking the cap dynamically instead of having it defined statically in
the makefile.
I'll send a short patch that does that.
--
Sasha.
next prev parent reply other threads:[~2011-12-14 6:35 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-13 7:00 [PATCH V2 0/2] kvm tools: PPC64 basic support Matt Evans
2011-12-13 7:00 ` Matt Evans
2011-12-13 7:00 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Matt Evans
2011-12-13 7:00 ` Matt Evans
2011-12-13 7:44 ` Pekka Enberg
2011-12-13 7:44 ` Pekka Enberg
2011-12-14 9:38 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture Benjamin Herrenschmidt
2011-12-14 9:38 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Benjamin Herrenschmidt
2011-12-14 10:30 ` Pekka Enberg
2011-12-14 10:30 ` Pekka Enberg
2011-12-14 10:41 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture Benjamin Herrenschmidt
2011-12-14 10:41 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Benjamin Herrenschmidt
[not found] ` <521B67B5-FA19-479A-A1DF-14A0E65C30AF@suse.de>
2011-12-14 11:31 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture Pekka Enberg
2011-12-14 11:31 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Pekka Enberg
2011-12-14 13:36 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture Asias He
2011-12-14 13:36 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Asias He
2011-12-13 8:23 ` Alexander Graf
2011-12-13 8:23 ` Alexander Graf
2011-12-15 1:27 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture Matt Evans
2011-12-15 1:27 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Matt Evans
2011-12-15 1:37 ` Alexander Graf
2011-12-15 1:37 ` Alexander Graf
2011-12-15 2:20 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture Matt Evans
2011-12-15 2:20 ` [PATCH V2 1/2] kvm tools: Add initial SPAPR PPC64 architecture support Matt Evans
2011-12-13 17:43 ` Pekka Enberg
2011-12-13 17:43 ` Pekka Enberg
2011-12-13 21:41 ` Matt Evans
2011-12-13 21:41 ` Matt Evans
2011-12-13 7:00 ` [PATCH V2 2/2] kvm tools: Make virtio-pci's ioeventfd__add_event() fall back gracefully if ioeventfd Matt Evans
2011-12-13 7:00 ` [PATCH V2 2/2] kvm tools: Make virtio-pci's ioeventfd__add_event() fall back gracefully if ioeventfds unavailable Matt Evans
2011-12-13 8:25 ` [PATCH V2 0/2] kvm tools: PPC64 basic support Sasha Levin
2011-12-13 10:23 ` Sasha Levin
2011-12-14 0:34 ` Matt Evans
2011-12-14 0:34 ` Matt Evans
2011-12-14 6:35 ` Sasha Levin [this message]
2011-12-14 6:35 ` Sasha Levin
2011-12-14 9:35 ` Benjamin Herrenschmidt
2011-12-14 9:35 ` Benjamin Herrenschmidt
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1323844555.3992.13.camel@lappy \
--to=levinsasha928@gmail.com \
--cc=agraf@suse.de \
--cc=asias.hejun@gmail.com \
--cc=gorcunov@gmail.com \
--cc=kvm-ppc@vger.kernel.org \
--cc=kvm@vger.kernel.org \
--cc=matt@ozlabs.org \
--cc=penberg@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.