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Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-mode
From: |
Dr. David Alan Gilbert |
Subject: |
Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional |
Date: |
Thu, 10 Jan 2019 15:01:25 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Michael S. Tsirkin (address@hidden) wrote:
> On Thu, Jan 10, 2019 at 11:31:23AM -0200, Eduardo Habkost wrote:
> > On Thu, Jan 10, 2019 at 12:35:26PM +0400, Marc-André Lureau wrote:
> > > Hi
> > >
> > > On Thu, Jan 10, 2019 at 6:05 AM Eduardo Habkost <address@hidden> wrote:
> > > >
> > > > The disable-legacy and disable-modern properties apply only to
> > > > some virtio-pci devices. Make those properties optional.
> > > >
> > > > This fixes the crash introduced by commit f6e501a28ef9 ("virtio: Provide
> > > > version-specific variants of virtio PCI devices"):
> > > >
> > > > $ qemu-system-x86_64 -machine pc-i440fx-2.6 \
> > > > -device virtio-net-pci-non-transitional
> > > > Unexpected error in object_property_find() at qom/object.c:1092:
> > > > qemu-system-x86_64: -device virtio-net-pci-non-transitional: can't
> > > > apply \
> > > > global virtio-pci.disable-modern=on: Property '.disable-modern' not
> > > > found
> > > > Aborted (core dumped)
> > > >
> > > > Reported-by: Thomas Huth <address@hidden>
> > > > Fixes: f6e501a28ef9 ("virtio: Provide version-specific variants of
> > > > virtio PCI devices")
> > > > Signed-off-by: Eduardo Habkost <address@hidden>
> > > > ---
> > > > hw/core/machine.c | 5 +++--
> > > > 1 file changed, 3 insertions(+), 2 deletions(-)
> > > >
> > > > diff --git a/hw/core/machine.c b/hw/core/machine.c
> > > > index 5530b71981..a19143aa44 100644
> > > > --- a/hw/core/machine.c
> > > > +++ b/hw/core/machine.c
> > > > @@ -91,8 +91,9 @@ const size_t hw_compat_2_7_len =
> > > > G_N_ELEMENTS(hw_compat_2_7);
> > > >
> > > > GlobalProperty hw_compat_2_6[] = {
> > > > { "virtio-mmio", "format_transport_address", "off" },
> > > > - { "virtio-pci", "disable-modern", "on" },
> > > > - { "virtio-pci", "disable-legacy", "off" },
> > > > + /* Optional because not all virtio-pci devices support legacy mode
> > > > */
> > > > + { "virtio-pci", "disable-modern", "on", .optional = true },
> > > > + { "virtio-pci", "disable-legacy", "off", .optional = true },
> > >
> > > Could the generic devices implement a specific interface instead?
> > > virtio-pci-generic?
> >
> > This is the kind of complexity I wanted to avoid. We already
> > have too many interface names for subsets of PCI and virtio
> > devices.
> >
> > >
> > > Adding "optional" handling looks like it may hide some other errors.
> >
> > What if we just make "optional" mean "skip if the property
> > doesn't exist", as suggested by Cornelia and Dave?
>
> That's the more standard meaning of the word optional, isn't it?
Well the word is a separate issue; 'optional' is probably a bad choice
but that's less important than what it actually does.
I'd go for skip_if_missing which is explicit.
Dave
>
> > --
> > Eduardo
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- Re: [Qemu-devel] [PATCH v2 1/3] qom: Don't keep error value between object_property_parse() calls, (continued)
- [Qemu-devel] [PATCH v2 2/3] globals: Allow global properties to be optional, Eduardo Habkost, 2019/01/09
- [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Eduardo Habkost, 2019/01/09
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Marc-André Lureau, 2019/01/10
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Dr. David Alan Gilbert, 2019/01/10
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Eduardo Habkost, 2019/01/10
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Michael S. Tsirkin, 2019/01/10
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional,
Dr. David Alan Gilbert <=
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Eduardo Habkost, 2019/01/10
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Marc-André Lureau, 2019/01/10
- Re: [Qemu-devel] [PATCH v2 3/3] virtio: Make disable-legacy/disable-modern compat properties optional, Cornelia Huck, 2019/01/11