Re: [PATCH 17/17] hw/block/nvme: change controller pci id

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Klaus Jensen (its@irrelevant.dk) wrote:
> On Sep  7 11:37, Dr. David Alan Gilbert wrote:
> > * Philippe Mathieu-Daudé (philmd@redhat.com) wrote:
> > > +David in case
> > > 
> > > On 9/4/20 4:19 PM, Klaus Jensen wrote:
> > > > From: Klaus Jensen <k.jensen@samsung.com>
> > > > 
> > > > There are two reasons for changing this:
> > > > 
> > > >   1. The nvme device currently uses an internal Intel device id.
> > > > 
> > > >   2. Since commits "nvme: fix write zeroes offset and count" and "nvme:
> > > >      support multiple namespaces" the controller device no longer has
> > > >      the quirks that the Linux kernel think it has.
> > > > 
> > > >      As the quirks are applied based on pci vendor and device id, change
> > > >      them to get rid of the quirks.
> > > > 
> > > > To keep backward compatibility, add a new 'x-use-intel-id' parameter to
> > > > the nvme device to force use of the Intel vendor and device id. This is
> > > > off by default but add a compat property to set this for 5.1 machines
> > > > and older.
> > > 
> > > So now what happens if you start a 5.1 machine with a recent kernel?
> > > Simply the kernel will use unnecessary quirks, or are there more
> > > changes in behavior?
> > 
> > Seems reasonable to me...but...
> > 
> > > > 
> > > > Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
> > > > Reviewed-by: Keith Busch <kbusch@kernel.org>
> > > > Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
> > > > ---
> > > >  hw/block/nvme.c   | 12 ++++++++++--
> > > >  hw/block/nvme.h   |  1 +
> > > >  hw/core/machine.c |  1 +
> > > >  3 files changed, 12 insertions(+), 2 deletions(-)
> > > > 
> > > > diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> > > > index 453d3a89d475..8018f8679366 100644
> > > > --- a/hw/block/nvme.c
> > > > +++ b/hw/block/nvme.c
> > > > @@ -2749,6 +2749,15 @@ static void nvme_init_pci(NvmeCtrl *n, PCIDevice *pci_dev, Error **errp)
> > > >  
> > > >      pci_conf[PCI_INTERRUPT_PIN] = 1;
> > > >      pci_config_set_prog_interface(pci_conf, 0x2);
> > > > +
> > > > +    if (n->params.use_intel_id) {
> > > > +        pci_config_set_vendor_id(pci_conf, PCI_VENDOR_ID_INTEL);
> > > > +        pci_config_set_device_id(pci_conf, 0x5846);
> > 
> > Wasn't that magic number 5845 down there ?
> > 
> 
> Argh! My first version of this just bumbed the intel device id and it
> got left there.
> 
> Good find! Thank you!

It may be best to turn it into a constant in include/hw/pci/pci_ids.h if
it corresponds to some real Intel device.

Dave

-- 
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK