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authorAlex Williamson <alex.williamson@redhat.com>2018-03-21 19:46:21 +0100
committerAlex Williamson <alex.williamson@redhat.com>2018-03-26 21:22:58 +0200
commit30656177c4080460b936709ff6648f201d7d2c1a (patch)
tree736aca0117c845222f0fd44cdcd661f431bd810d /MAINTAINERS
parentvfio/pci: Use endian neutral helpers (diff)
downloadlinux-30656177c4080460b936709ff6648f201d7d2c1a.tar.xz
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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>
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