Currently vduse does not seem to support configuration space writes
(vduse_vdpa_set_config does nothing). Is there any plan to lift that
limitation? I am aware of the discussions that took place here:
https://patchwork.kernel.org/project/netdevbpf/patch/20210615141331.407-11-xieyon...@bytedance.co
On Wed, Jul 24, 2024 at 11:38 AM Srivatsa Vaddagiri
wrote:
>
> Currently vduse does not seem to support configuration space writes
> (vduse_vdpa_set_config does nothing). Is there any plan to lift that
> limitation? I am aware of the discussions that took place here:
>
The problem is that current
On Wed, Jul 24, 2024 at 11:45 AM Srivatsa Vaddagiri
wrote:
>
> Currently vduse does not seem to support configuration space writes
> (vduse_vdpa_set_config does nothing). Is there any plan to lift that
> limitation? I am aware of the discussions that took place here:
>
> https://patchwork.kernel.o
On Fri, Jul 26, 2024 at 10:47:59AM +0800, Jason Wang wrote:
> On Wed, Jul 24, 2024 at 11:45 AM Srivatsa Vaddagiri
> wrote:
> >
> > Currently vduse does not seem to support configuration space writes
> > (vduse_vdpa_set_config does nothing). Is there any plan to lift that
> > limitation? I am aware
* Jason Wang [2024-07-26 10:47:59]:
> On Wed, Jul 24, 2024 at 11:45???AM Srivatsa Vaddagiri
> wrote:
> >
> > Currently vduse does not seem to support configuration space writes
> > (vduse_vdpa_set_config does nothing). Is there any plan to lift that
> > limitation? I am aware of the discussions
* Yongji Xie [2024-07-26 10:37:40]:
> On Wed, Jul 24, 2024 at 11:38???AM Srivatsa Vaddagiri
> wrote:
> >
> > Currently vduse does not seem to support configuration space writes
> > (vduse_vdpa_set_config does nothing). Is there any plan to lift that
> > limitation? I am aware of the discussions
On Fri, Jul 26, 2024 at 12:33:24PM +0530, Srivatsa Vaddagiri wrote:
> > Maybe you can give an example for this? We cache the configuration
> > space to a faster access to that.
>
> Yes for the same reason of faster access, we wish to have config information
> cached in hypervisor. In case of VDUSE
* Jason Wang [2024-07-26 10:47:59]:
> > 2) For PCI pass-through devices, we are concerned of letting VMM be in
> > charge of
> > emulating the complete configuration space (how can VM defend against
> > invalid
> > attributes presented for passthr devices)?
>
> Virtio driver has been hardened
On Fri, Jul 26, 2024 at 1:15 PM Michael S. Tsirkin wrote:
>
> On Fri, Jul 26, 2024 at 10:47:59AM +0800, Jason Wang wrote:
> > On Wed, Jul 24, 2024 at 11:45 AM Srivatsa Vaddagiri
> > wrote:
> > >
> > > Currently vduse does not seem to support configuration space writes
> > > (vduse_vdpa_set_config
On Fri, Jul 26, 2024 at 3:04 PM Srivatsa Vaddagiri
wrote:
>
> * Jason Wang [2024-07-26 10:47:59]:
>
> > On Wed, Jul 24, 2024 at 11:45???AM Srivatsa Vaddagiri
> > wrote:
> > >
> > > Currently vduse does not seem to support configuration space writes
> > > (vduse_vdpa_set_config does nothing). Is
* Jason Wang [2024-07-29 10:16:48]:
> > Without this optimization, guest VCPU would have stalled until VMM in host
> > can
> > emulate it, which can be long, especially a concern when the read is issued
> > in
> > hot path (interrupt handler, w/o MSI_X).
>
> I think I agree with Michael, let's
On Fri, Jul 26, 2024 at 8:42 PM Srivatsa Vaddagiri
wrote:
>
> * Jason Wang [2024-07-26 10:47:59]:
>
> > > 2) For PCI pass-through devices, we are concerned of letting VMM be in
> > > charge of
> > > emulating the complete configuration space (how can VM defend against
> > > invalid
> > > attrib
On Mon, Jul 29, 2024 at 2:03 PM Srivatsa Vaddagiri
wrote:
>
> * Jason Wang [2024-07-29 10:16:48]:
>
> > > Without this optimization, guest VCPU would have stalled until VMM in
> > > host can
> > > emulate it, which can be long, especially a concern when the read is
> > > issued in
> > > hot pat
On Tue, Jul 30, 2024 at 11:06 AM Jason Wang wrote:
>
> On Mon, Jul 29, 2024 at 2:03 PM Srivatsa Vaddagiri
> wrote:
> >
> > * Jason Wang [2024-07-29 10:16:48]:
> >
> > > > Without this optimization, guest VCPU would have stalled until VMM in
> > > > host can
> > > > emulate it, which can be long
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