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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 11:15:17 +0000 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
* Marc-André Lureau (address@hidden) 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?
>
> Adding "optional" handling looks like it may hide some other errors.
I think it would be OK if it only ignored the non-existent property
errors (or better, tested for their existence and then skipped if
they weren't there).
Dave
> > };
> > const size_t hw_compat_2_6_len = G_N_ELEMENTS(hw_compat_2_6);
> >
> > --
> > 2.18.0.rc1.1.g3f1ff2140
> >
> >
>
>
> --
> Marc-André Lureau
--
Dr. David Alan Gilbert / address@hidden / Manchester, UK
- [Qemu-devel] [PATCH v2 0/3] Fix virtio-*(-non)-transitional crash on 2.6 machine-types, Eduardo Habkost, 2019/01/09
- [Qemu-devel] [PATCH v2 1/3] qom: Don't keep error value between object_property_parse() calls, Eduardo Habkost, 2019/01/09
- [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 <=
- 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, 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, 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