Re: [RFC PATCH 15/15] nvme-pci: Allow mmaping the CMB in userspace

2020-11-09 Thread Logan Gunthorpe
On 2020-11-09 8:03 a.m., Keith Busch wrote: > On Fri, Nov 06, 2020 at 10:00:36AM -0700, Logan Gunthorpe wrote: >> Allow userspace to obtain CMB memory by mmaping the controller's >> char device. The mmap call allocates and returns a hunk of CMB memory, >> (the offset is ignored) so userspace doe

Re: [RFC PATCH 15/15] nvme-pci: Allow mmaping the CMB in userspace

2020-11-09 Thread Keith Busch
On Fri, Nov 06, 2020 at 10:00:36AM -0700, Logan Gunthorpe wrote: > Allow userspace to obtain CMB memory by mmaping the controller's > char device. The mmap call allocates and returns a hunk of CMB memory, > (the offset is ignored) so userspace does not have control over the > address within the CMB

Re: [RFC PATCH 15/15] nvme-pci: Allow mmaping the CMB in userspace

2020-11-06 Thread Logan Gunthorpe
On 2020-11-06 10:39 a.m., Jason Gunthorpe wrote: > On Fri, Nov 06, 2020 at 10:00:36AM -0700, Logan Gunthorpe wrote: >> Allow userspace to obtain CMB memory by mmaping the controller's >> char device. The mmap call allocates and returns a hunk of CMB memory, >> (the offset is ignored) so userspa

Re: [RFC PATCH 15/15] nvme-pci: Allow mmaping the CMB in userspace

2020-11-06 Thread Jason Gunthorpe
On Fri, Nov 06, 2020 at 10:00:36AM -0700, Logan Gunthorpe wrote: > Allow userspace to obtain CMB memory by mmaping the controller's > char device. The mmap call allocates and returns a hunk of CMB memory, > (the offset is ignored) so userspace does not have control over the > address within the CMB