Displaying 5 results from an estimated 5 matches for "overmap".
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overlap
2013 Jul 03
1
RFC: vfio interface for platform devices
...ll get reinjected into the normal QEMU MMIO handling
> path which will just issue a read/write on the mmap'ed region if it's
> not declared as emulated.
I agree that's what should happen by default, but there should be a way
for root to tell vfio that a device is allowed to overmap, in order to
get the performance benefit of direct access in cases where root knows
(or explicitly doesn't care) that it is safe.
-Scott
2013 Jul 03
1
RFC: vfio interface for platform devices
...ll get reinjected into the normal QEMU MMIO handling
> path which will just issue a read/write on the mmap'ed region if it's
> not declared as emulated.
I agree that's what should happen by default, but there should be a way
for root to tell vfio that a device is allowed to overmap, in order to
get the performance benefit of direct access in cases where root knows
(or explicitly doesn't care) that it is safe.
-Scott
2013 Jul 03
0
RFC: vfio interface for platform devices
...nto the normal QEMU MMIO handling
> > path which will just issue a read/write on the mmap'ed region if it's
> > not declared as emulated.
>
> I agree that's what should happen by default, but there should be a way
> for root to tell vfio that a device is allowed to overmap, in order to
> get the performance benefit of direct access in cases where root knows
> (or explicitly doesn't care) that it is safe.
Perhaps a sysfs mechanism like this:
echo "/sys/bus/platform/devices/ffe210000.usb" > /sys/bus/platform/drivers/vfio-platform/allow_overmap...
2013 Jul 02
7
RFC: vfio interface for platform devices
The write-up below is the first draft of a proposal for how the kernel can expose
platform devices to user space using vfio.
In short, I'm proposing a new ioctl VFIO_DEVICE_GET_DEVTREE_INFO which
allows user space to correlate regions and interrupts to the corresponding
device tree node structure that is defined for most platform devices.
Regards,
Stuart Yoder
2013 Jul 02
7
RFC: vfio interface for platform devices
The write-up below is the first draft of a proposal for how the kernel can expose
platform devices to user space using vfio.
In short, I'm proposing a new ioctl VFIO_DEVICE_GET_DEVTREE_INFO which
allows user space to correlate regions and interrupts to the corresponding
device tree node structure that is defined for most platform devices.
Regards,
Stuart Yoder