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Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backe
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram |
Date: |
Thu, 1 Feb 2018 18:59:07 +0200 |
On Thu, Feb 01, 2018 at 02:57:39PM -0200, Eduardo Habkost wrote:
> On Thu, Feb 01, 2018 at 06:48:54PM +0200, Michael S. Tsirkin wrote:
> > On Thu, Feb 01, 2018 at 02:31:32PM -0200, Eduardo Habkost wrote:
> > > On Thu, Feb 01, 2018 at 04:24:30PM +0200, Michael S. Tsirkin wrote:
> > > [...]
> > > > The full fix would be to allow QEMU to map a list of
> > > > pages to a guest supplied IOVA.
> > >
> > > Thanks, that's what I expected.
> > >
> > > While this is not possible, the only requests I have for this
> > > patch is that we clearly document:
> > > * What's the only purpose of share=on on a host-memory-backend
> > > object (due to pvrdma limitations).
> > > * The potential undesirable side-effects of setting share=on.
> > > * On the commit message and other comments, clearly distinguish
> > > HVAs in the QEMU address-space from IOVAs, to avoid confusion.
> >
> > Looking forward, when we do support it, how will management find out
> > it no longer needs to pass the share parameter?
> >
> > Further, if the side effects of the share parameter go away,
> > how will it know these no longer hold?
>
> A query-host-capabilities or similar QMP command seems necessary
> for that.
Is anyone working on that?
> It would be useful for other stuff like MAP_SYNC.
> --
> Eduardo
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, (continued)
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Marcel Apfelbaum, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Marcel Apfelbaum, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Paolo Bonzini, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Michael S. Tsirkin, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Michael S. Tsirkin, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Michael S. Tsirkin, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram,
Michael S. Tsirkin <=
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Michael S. Tsirkin, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Marcel Apfelbaum, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Eduardo Habkost, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Marcel Apfelbaum, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Michael S. Tsirkin, 2018/02/01
- Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Marcel Apfelbaum, 2018/02/01
Re: [Qemu-devel] [PATCH V8 1/4] mem: add share parameter to memory-backend-ram, Michael S. Tsirkin, 2018/02/01