On Wed, Jan 31, 2018 at 11:10:07PM +0200, Michael S. Tsirkin wrote: > On Wed, Jan 31, 2018 at 06:40:59PM -0200, Eduardo Habkost wrote: > > On Wed, Jan 17, 2018 at 11:54:18AM +0200, Marcel Apfelbaum wrote: > > > Currently only file backed memory backend can > > > be created with a "share" flag in order to allow > > > sharing guest RAM with other processes in the host. > > > > > > Add the "share" flag also to RAM Memory Backend > > > in order to allow remapping parts of the guest RAM > > > to different host virtual addresses. This is needed > > > by the RDMA devices in order to remap non-contiguous > > > QEMU virtual addresses to a contiguous virtual address range. > > > > > > > Why do we need to make this configurable? Would anything break > > if MAP_SHARED was always used if possible? > > See Documentation/vm/numa_memory_policy.txt for a list > of complications.
Ew. > > Maybe we should more of an effort to detect and report these > issues. Probably. Having other features breaking silently when using pvrdma doesn't sound good. We must at least document those problems in the documentation for memory-backend-ram. BTW, what's the root cause for requiring HVAs in the buffer? Can this be fixed? -- Eduardo
