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Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backe
From: |
Eduardo Habkost |
Subject: |
Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram |
Date: |
Wed, 31 Jan 2018 18:40:59 -0200 |
User-agent: |
Mutt/1.9.1 (2017-09-22) |
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?
> Moved the "share" flag to the Host Memory base class,
> modified phys_mem_alloc to include the new parameter
> and a new interface memory_region_init_ram_shared_nomigrate.
>
> There are no functional changes if the new flag is not used.
>
> Signed-off-by: Marcel Apfelbaum <address@hidden>
[...]
--
Eduardo
[Qemu-devel] [PATCH V8 2/4] docs: add pvrdma device documentation., Marcel Apfelbaum, 2018/01/17
[Qemu-devel] [PATCH V8 4/4] MAINTAINERS: add entry for hw/rdma, Marcel Apfelbaum, 2018/01/17
[Qemu-devel] [PATCH V8 3/4] pvrdma: initial implementation, Marcel Apfelbaum, 2018/01/17
Re: [Qemu-devel] [PATCH V8 0/4] hw/pvrdma: PVRDMA device implementation, no-reply, 2018/01/17