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authorTiwei Bie <tiwei.bie@intel.com>2019-01-23 17:50:26 +0800
committerMichael S. Tsirkin <mst@redhat.com>2019-01-24 10:15:42 -0500
commit45383fb0f42db3945ac6cc658704706cdae19528 (patch)
treeb25548cd2da896976f1cf718b4b97fd67efece92 /drivers/irqchip/irq-xtensa-pic.c
parent49a57857aeea06ca831043acbb0fa5e0f50602fd (diff)
virtio: support VIRTIO_F_ORDER_PLATFORM
This patch introduces the support for VIRTIO_F_ORDER_PLATFORM. If this feature is negotiated, the driver must use the barriers suitable for hardware devices. Otherwise, the device and driver are assumed to be implemented in software, that is they can be assumed to run on identical CPUs in an SMP configuration. Thus a weaker form of memory barriers is sufficient to yield better performance. It is recommended that an add-in card based PCI device offers this feature for portability. The device will fail to operate further or will operate in a slower emulation mode if this feature is offered but not accepted. Signed-off-by: Tiwei Bie <tiwei.bie@intel.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/irqchip/irq-xtensa-pic.c')
0 files changed, 0 insertions, 0 deletions