[Bug 220740] Host crash when do PF passthrough to KVM guest with some devices

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=220740

Alex Williamson (alex.l.williamson@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alex.l.williamson@gmail.com
                   |                            |, ramesh.thomas@intel.com

--- Comment #2 from Alex Williamson (alex.l.williamson@gmail.com) ---
(In reply to Chen, Fan from comment #1)
> I reproduced this issue on SPR, GNR, SRF, CWF.

Were there platforms that did not reproduce?

> If we disable "PCIE Error Enabling" in BIOS, host will not crash.
> 
> After bisecting, the first bad commit is:
> commit 2b938e3db335e3670475e31a722c2bee34748c5a (HEAD)
...
> --- a/drivers/vfio/pci/vfio_pci_rdwr.c
> +++ b/drivers/vfio/pci/vfio_pci_rdwr.c
> @@ -16,6 +16,7 @@
>  #include <linux/io.h>
>  #include <linux/vfio.h>
>  #include <linux/vgaarb.h>
> +#include <linux/io-64-nonatomic-lo-hi.h>
> 
>  #include "vfio_pci_priv.h"

Theoretically this would only define non-atomic ioread64 and iowrite64 support
on a host that doesn't already have native support for these.  Any 64-bit
x86_64 host should already define ioread/write64, so no change in behavior is
expected or intended.  Can you provide the kernel .config and compiler
information?

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