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Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions |
Date: |
Tue, 23 Aug 2011 21:26:32 +0300 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Aug 23, 2011 at 12:21:47PM -0600, Alex Williamson wrote:
> On Tue, 2011-08-23 at 21:17 +0300, Michael S. Tsirkin wrote:
> > On Tue, Aug 23, 2011 at 07:28:08PM +0200, Jan Kiszka wrote:
> > > From: Alex Williamson <address@hidden>
> > >
> > > Nothing good can happen when we overlap capabilities
> > >
> > > [ Jan: rebased over qemu, minor formatting ]
> > >
> > > Signed-off-by: Jan Kiszka <address@hidden>
> >
> > I'll stick an assert there instead. Normal devices
> > don't generate overlapping caps unless there's a bug,
> > and device assignment should do it's own checks.
> >
> > I really have a mind to rip out the used array too.
>
> So you'd rather kill qemu rather than have a reasonable error return
> path... great :(
>
> Alex
Well that will make it possible to make pci_add_capability return void,
less work for callers :) Dev assignment is really the only place where
capability offsets need to be verified.
> > > ---
> > > hw/pci.c | 14 ++++++++++++++
> > > 1 files changed, 14 insertions(+), 0 deletions(-)
> > >
> > > diff --git a/hw/pci.c b/hw/pci.c
> > > index 6124790..ff20631 100644
> > > --- a/hw/pci.c
> > > +++ b/hw/pci.c
> > > @@ -1952,11 +1952,25 @@ int pci_add_capability(PCIDevice *pdev, uint8_t
> > > cap_id,
> > > uint8_t offset, uint8_t size)
> > > {
> > > uint8_t *config;
> > > + int i;
> > > +
> > > if (!offset) {
> > > offset = pci_find_space(pdev, size);
> > > if (!offset) {
> > > return -ENOSPC;
> > > }
> > > + } else {
> > > + for (i = offset; i < offset + size; i++) {
> > > + if (pdev->used[i]) {
> > > + fprintf(stderr, "ERROR: %04x:%02x:%02x.%x "
> > > + "Attempt to add PCI capability %x at offset "
> > > + "%x overlaps existing capability %x at offset
> > > %x\n",
> > > + pci_find_domain(pdev->bus),
> > > pci_bus_num(pdev->bus),
> > > + PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
> > > + cap_id, offset, pdev->config_map[i], i);
> > > + return -EFAULT;
> > > + }
> > > + }
> > > }
> > >
> > > config = pdev->config + offset;
> > > --
> > > 1.7.3.4
>
>
- [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Jan Kiszka, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Michael S. Tsirkin, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Alex Williamson, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Alex Williamson, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Michael S. Tsirkin, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Alex Williamson, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Don Dutile, 2011/08/23
- Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Michael S. Tsirkin, 2011/08/24
Re: [Qemu-devel] [PATCH] pci: Error on PCI capability collisions, Michael S. Tsirkin, 2011/08/24