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author | Alex Williamson <alex.williamson@redhat.com> | 2018-03-21 12:46:21 -0600 |
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committer | Alex Williamson <alex.williamson@redhat.com> | 2018-03-26 13:22:58 -0600 |
commit | 30656177c4080460b936709ff6648f201d7d2c1a (patch) | |
tree | 736aca0117c845222f0fd44cdcd661f431bd810d /arch/unicore32 | |
parent | 07fd7ef3a1c25a11015bb5821c9c5982f722d4a2 (diff) |
vfio/pci: Add ioeventfd support
The ioeventfd here is actually irqfd handling of an ioeventfd such as
supported in KVM. A user is able to pre-program a device write to
occur when the eventfd triggers. This is yet another instance of
eventfd-irqfd triggering between KVM and vfio. The impetus for this
is high frequency writes to pages which are virtualized in QEMU.
Enabling this near-direct write path for selected registers within
the virtualized page can improve performance and reduce overhead.
Specifically this is initially targeted at NVIDIA graphics cards where
the driver issues a write to an MMIO register within a virtualized
region in order to allow the MSI interrupt to re-trigger.
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'arch/unicore32')
0 files changed, 0 insertions, 0 deletions