From: "Michael S. Tsirkin" <mst@redhat.com>
To: Yuval Shaia <yuval.shaia@oracle.com>
Cc: Marcel Apfelbaum <marcel@redhat.com>,
qemu-devel@nongnu.org, ehabkost@redhat.com, imammedo@redhat.com,
pbonzini@redhat.com
Subject: Re: [Qemu-devel] [PATCH V2 0/5] hw/pvrdma: PVRDMA device implementation
Date: Thu, 21 Dec 2017 16:22:44 +0200 [thread overview]
Message-ID: <20171221162200-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <20171221072750.GC2931@yuvallap>
On Thu, Dec 21, 2017 at 09:27:51AM +0200, Yuval Shaia wrote:
> > >
> > > > What happens if guest attempts to register all its memory?
> > > >
> > >
> > > Then we loose, is not different from bare metal, reg_mr will pin all the RAM.
> >
> > We need to find a way to communicate to guests about amount
> > of memory they can pin.
>
> dev_caps.max_mr_size is the way device limits guest driver.
> This value is controlled by the command line argument dev-caps-max-mr-size
> so we should be fine (btw, default value is 1<<32).
Isn't that still leaving the option for guest to register all memory,
just in chunks?
> >
> > > However this is only one scenario, and hopefully not much used
> > > for RoCE. (I know IPoIB does that, but it doesn't make sense to use it with RoCE).
> >
> > SRP does it too AFAIK.
> >
next prev parent reply other threads:[~2017-12-21 14:22 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-17 12:54 [Qemu-devel] [PATCH V2 0/5] hw/pvrdma: PVRDMA device implementation Marcel Apfelbaum
2017-12-17 12:54 ` [Qemu-devel] [PATCH V2 1/5] pci/shpc: Move function to generic header file Marcel Apfelbaum
2017-12-17 18:16 ` Philippe Mathieu-Daudé
2017-12-17 19:03 ` Yuval Shaia
2017-12-17 12:54 ` [Qemu-devel] [PATCH V2 2/5] mem: add share parameter to memory-backend-ram Marcel Apfelbaum
2017-12-17 12:54 ` [Qemu-devel] [PATCH V2 3/5] docs: add pvrdma device documentation Marcel Apfelbaum
2017-12-19 17:47 ` Michael S. Tsirkin
2017-12-20 14:45 ` Marcel Apfelbaum
2017-12-17 12:54 ` [Qemu-devel] [PATCH V2 4/5] pvrdma: initial implementation Marcel Apfelbaum
2017-12-19 16:12 ` Michael S. Tsirkin
2017-12-19 17:29 ` Marcel Apfelbaum
2017-12-19 17:48 ` Michael S. Tsirkin
2017-12-20 15:25 ` Yuval Shaia
2017-12-20 18:01 ` Michael S. Tsirkin
2017-12-19 19:13 ` Philippe Mathieu-Daudé
2017-12-20 4:08 ` Michael S. Tsirkin
2017-12-20 14:46 ` Marcel Apfelbaum
2017-12-17 12:54 ` [Qemu-devel] [PATCH V2 5/5] MAINTAINERS: add entry for hw/net/pvrdma Marcel Apfelbaum
2017-12-19 17:49 ` Michael S. Tsirkin
2017-12-19 18:05 ` [Qemu-devel] [PATCH V2 0/5] hw/pvrdma: PVRDMA device implementation Michael S. Tsirkin
2017-12-20 15:07 ` Marcel Apfelbaum
2017-12-21 0:05 ` Michael S. Tsirkin
2017-12-21 7:27 ` Yuval Shaia
2017-12-21 14:22 ` Michael S. Tsirkin [this message]
2017-12-21 15:59 ` Marcel Apfelbaum
2017-12-21 20:46 ` Michael S. Tsirkin
2017-12-21 22:30 ` Yuval Shaia
2017-12-22 4:58 ` Marcel Apfelbaum
2017-12-20 17:56 ` Yuval Shaia
2017-12-20 18:05 ` Michael S. Tsirkin
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