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author | Alex Williamson <alex.williamson@redhat.com> | 2018-09-25 21:01:27 +0200 |
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committer | Alex Williamson <alex.williamson@redhat.com> | 2018-09-25 21:01:27 +0200 |
commit | db04264fe9bc0f2b62e036629f9afb530324b693 (patch) | |
tree | 6b80e98b183c9c3c36ff2ae3dcf2c41e906766e1 /drivers/powercap | |
parent | vfio/pci: Fix potential memory leak in vfio_msi_cap_len (diff) | |
download | linux-db04264fe9bc0f2b62e036629f9afb530324b693.tar.xz linux-db04264fe9bc0f2b62e036629f9afb530324b693.zip |
vfio/pci: Mask buggy SR-IOV VF INTx support
The SR-IOV spec requires that VFs must report zero for the INTx pin
register as VFs are precluded from INTx support. It's much easier for
the host kernel to understand whether a device is a VF and therefore
whether a non-zero pin register value is bogus than it is to do the
same in userspace. Override the INTx count for such devices and
virtualize the pin register to provide a consistent view of the device
to the user.
As this is clearly a spec violation, warn about it to support hardware
validation, but also provide a known whitelist as it doesn't do much
good to continue complaining if the hardware vendor doesn't plan to
fix it.
Known devices with this issue: 8086:270c
Tested-by: Gage Eads <gage.eads@intel.com>
Reviewed-by: Ashok Raj <ashok.raj@intel.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/powercap')
0 files changed, 0 insertions, 0 deletions