> Subject: RE: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> IOMMU mode
>
> > Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for
> > NO- IOMMU mode
> >
> > On Wed, Nov 06, 2024 at 12: 38: 02PM +, Srujana Challa wrote: >
> Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> IOMMU mode
>
> On Wed, Nov 06, 2024 at 12: 38: 02PM +, Srujana Challa wrote: > It is
> going in circles, let me give the summary, > Issue: We need to address the
> lack
> of no-IOMM
On Thu, Oct 24, 2024 at 02:05:43AM -0700, Christoph Hellwig wrote:
> On Wed, Oct 23, 2024 at 04:19:02AM -0400, Michael S. Tsirkin wrote:
> > On Tue, Oct 22, 2024 at 11:58:19PM -0700, Christoph Hellwig wrote:
> > > On Sat, Oct 19, 2024 at 08:16:44PM -0400, Michael S. Tsirkin wrote:
> > > > Because p
On Wed, Nov 06, 2024 at 12:38:02PM +, Srujana Challa wrote:
> > Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> > IOMMU mode
> >
> > On Wed, Oct 23, 2024 at 04: 19: 02AM -0400, Michael S. Tsirkin wrote: > On
> > Tue, Oct 22, 2024
On Wed, Nov 06, 2024 at 12:38:02PM +, Srujana Challa wrote:
> It is going in circles, let me give the summary,
> Issue: We need to address the lack of no-IOMMU support in the vhost vDPA
> driver for better performance.
> Measured Performance: On the machine "13th Gen Intel(R) Core(TM) i9-13900
> Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> IOMMU mode
>
> On Wed, Oct 23, 2024 at 04: 19: 02AM -0400, Michael S. Tsirkin wrote: > On
> Tue, Oct 22, 2024 at 11: 58: 19PM -0700, Christoph Hellwig wrote: > > On Sat,
> Oct 19, 2024 at 08
On Wed, Oct 23, 2024 at 04:19:02AM -0400, Michael S. Tsirkin wrote:
> On Tue, Oct 22, 2024 at 11:58:19PM -0700, Christoph Hellwig wrote:
> > On Sat, Oct 19, 2024 at 08:16:44PM -0400, Michael S. Tsirkin wrote:
> > > Because people want to move from some vendor specific solution with vfio
> > > to a
On Tue, Oct 22, 2024 at 11:58:19PM -0700, Christoph Hellwig wrote:
> On Sat, Oct 19, 2024 at 08:16:44PM -0400, Michael S. Tsirkin wrote:
> > Because people want to move from some vendor specific solution with vfio
> > to a standard vdpa compatible one with vdpa.
>
> So now you have a want for new
On Sat, Oct 19, 2024 at 08:16:44PM -0400, Michael S. Tsirkin wrote:
> Because people want to move from some vendor specific solution with vfio
> to a standard vdpa compatible one with vdpa.
So now you have a want for new use cases and you turn that into a must
for supporting completely insecure an
On Wed, Oct 16, 2024 at 11:16:08PM -0700, Christoph Hellwig wrote:
> On Wed, Oct 16, 2024 at 01:41:51PM -0400, Michael S. Tsirkin wrote:
> > It's basically because vfio does, so we have to follow suit.
>
> That's a very bold argument, especially without any rationale of
>
> a) why you need to ma
> Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> IOMMU mode
>
> On Thu, Oct 17, 2024 at 08: 53: 08AM +, Srujana Challa wrote: > We
> observed better performance with "intel_iommu=on" in high-end x86
> machines, > indicating th
On Thu, Oct 17, 2024 at 08:53:08AM +, Srujana Challa wrote:
> We observed better performance with "intel_iommu=on" in high-end x86 machines,
> indicating that the performance limitations are specific to low-end x86
> hardware.
What does "low-end" vs "high-end" mean? Atom vs other cores?
> T
On Thu, Oct 17, 2024 at 4:53 PM Srujana Challa wrote:
>
> > Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> > IOMMU mode
> >
> > On Wed, Oct 16, 2024 at 05:28:27PM +, Srujana Challa wrote:
> > > When using the DPDK virtio user
> Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> IOMMU mode
>
> On Wed, Oct 16, 2024 at 05:28:27PM +, Srujana Challa wrote:
> > When using the DPDK virtio user PMD, we’ve noticed a significant 70%
> > performance improvement when IOMMU is
On Wed, Oct 16, 2024 at 05:28:27PM +, Srujana Challa wrote:
> When using the DPDK virtio user PMD, we’ve noticed a significant 70%
> performance improvement when IOMMU is disabled on specific low-end
> x86 machines. This performance improvement can be particularly
> advantageous for embedded pl
On Wed, Oct 16, 2024 at 01:41:51PM -0400, Michael S. Tsirkin wrote:
> It's basically because vfio does, so we have to follow suit.
That's a very bold argument, especially without any rationale of
a) why you need to match the feature set
b) how even adding it to vfio was agood idea
On Mon, Oct 14, 2024 at 08:48:27PM -0700, Christoph Hellwig wrote:
> On Mon, Oct 14, 2024 at 01:18:01PM +, Srujana Challa wrote:
> > > On Fri, Sep 20, 2024 at 07:35:28PM +0530, Srujana Challa wrote:
> > > > This patchset introduces support for an UNSAFE, no-IOMMU mode in the
> > > > vhost-vdpa
> Subject: Re: [EXTERNAL] Re: [PATCH v2 0/2] vhost-vdpa: Add support for NO-
> IOMMU mode
>
> On Mon, Oct 14, 2024 at 01: 18: 01PM +, Srujana Challa wrote: > > On Fri,
> Sep 20, 2024 at 07: 35: 28PM +0530, Srujana Challa wrote: > > > This patchset
> introduce
On Mon, Oct 14, 2024 at 01:18:01PM +, Srujana Challa wrote:
> > On Fri, Sep 20, 2024 at 07:35:28PM +0530, Srujana Challa wrote:
> > > This patchset introduces support for an UNSAFE, no-IOMMU mode in the
> > > vhost-vdpa driver. When enabled, this mode provides no device
> > > isolation, no DMA
> On Fri, Sep 20, 2024 at 07:35:28PM +0530, Srujana Challa wrote:
> > This patchset introduces support for an UNSAFE, no-IOMMU mode in the
> > vhost-vdpa driver. When enabled, this mode provides no device
> > isolation, no DMA translation, no host kernel protection, and cannot
> > be used for devic
On Fri, Sep 20, 2024 at 07:35:28PM +0530, Srujana Challa wrote:
> This patchset introduces support for an UNSAFE, no-IOMMU mode in the
> vhost-vdpa driver. When enabled, this mode provides no device isolation,
> no DMA translation, no host kernel protection, and cannot be used for
> device assignme
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