Hi!
Ira Snyder wrote on 15.01.2009 22:40:56:
> On Thu, Jan 15, 2009 at 10:22:53PM +0100, Arnd Bergmann wrote:
> > On Thursday 15 January 2009, Ira Snyder wrote:
> > > I have another question for you Arnd.
> > >
> > > What did you use as the host and guest drivers when you ran virtio
over
> > >
On Thu, Jan 15, 2009 at 11:53:24PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
> > I do have mailboxes (two inbound, two outbound) which can generate
> > interrupts, as well as doorbell registers (one inbound, one outbound).
> > The doorbell register's bits are "wri
On Thu, Jan 15, 2009 at 09:57:41PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
> > Some sort of Broadcom chipset, I think. Full dmesg and lspci output are
> > appended.
> >
> > The PCI bridge does mention MSI, so maybe it does support it. Would
> > using the DMA fr
On Thursday 15 January 2009, Ira Snyder wrote:
> I do have mailboxes (two inbound, two outbound) which can generate
> interrupts, as well as doorbell registers (one inbound, one outbound).
> The doorbell register's bits are "write 1 to clear", and can only be
> cleared by the opposite side.
>
Ok,
On Thu, Jan 15, 2009 at 10:22:53PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
> > I have another question for you Arnd.
> >
> > What did you use as the host and guest drivers when you ran virtio over
> > PCI? Did you use two unmodified instances of virtio_net (one
On Thursday 15 January 2009, Ira Snyder wrote:
> I have another question for you Arnd.
>
> What did you use as the host and guest drivers when you ran virtio over
> PCI? Did you use two unmodified instances of virtio_net (one on host,
> one on guest) for networking, or did you write new virtio dri
On Thursday 15 January 2009, Ira Snyder wrote:
> Some sort of Broadcom chipset, I think. Full dmesg and lspci output are
> appended.
>
> The PCI bridge does mention MSI, so maybe it does support it. Would
> using the DMA from the host mean that the guest system couldn't use the
> DMA controller at
On Thu, Jan 15, 2009 at 06:53:51PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
> >
> > These are PCI boards, not PCIe. The host computers are all Pentium3-M
> > systems. I tried enabling MSI on the Freescale boards in the driver, by
> > calling pci_enable_msi() dur
On Thu, Jan 15, 2009 at 06:53:51PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
> >
> > These are PCI boards, not PCIe. The host computers are all Pentium3-M
> > systems. I tried enabling MSI on the Freescale boards in the driver, by
> > calling pci_enable_msi() dur
On Thursday 15 January 2009, Ira Snyder wrote:
>
> These are PCI boards, not PCIe. The host computers are all Pentium3-M
> systems. I tried enabling MSI on the Freescale boards in the driver, by
> calling pci_enable_msi() during probe(), and it failed.
That doesn't really mean anything, just tha
On Thu, Jan 15, 2009 at 01:58:33PM +0100, Arnd Bergmann wrote:
> On Thursday 15 January 2009, Ira Snyder wrote:
>
> > The only problem with that is that you cannot route interrupts from the
> > DMA controller over PCI with the PowerPC core running. Which makes it
> > mostly useless for this case.
On Thursday 15 January 2009, Ira Snyder wrote:
> The only problem with that is that you cannot route interrupts from the
> DMA controller over PCI with the PowerPC core running. Which makes it
> mostly useless for this case.
If the host supports MSI, you can simply program the DMA controller to
w
On Tue, Jan 13, 2009 at 06:42:53PM +0100, Arnd Bergmann wrote:
> On Tuesday 13 January 2009, Ira Snyder wrote:
> > So do you program one channel of the DMA engine from the host side and
> > another channel from the guest side?
>
> Yes.
>
> > I tried to avoid having the host program the DMA contro
On Tuesday 13 January 2009, Ira Snyder wrote:
> So do you program one channel of the DMA engine from the host side and
> another channel from the guest side?
Yes.
> I tried to avoid having the host program the DMA controller at all.
> Using the DMAEngine API on the guest did better than I could a
On Tue, Jan 13, 2009 at 05:33:03PM +0100, Arnd Bergmann wrote:
> On Tuesday 13 January 2009, Ira Snyder wrote:
> > On Tue, Jan 13, 2009 at 01:02:52PM +1030, Rusty Russell wrote:
> > >
> > >Interesting system: the guest being able to access the
> > >host's memory but not (fully) vice-versa
On Tuesday 13 January 2009, Ira Snyder wrote:
> On Tue, Jan 13, 2009 at 01:02:52PM +1030, Rusty Russell wrote:
> >
> >Interesting system: the guest being able to access the
> >host's memory but not (fully) vice-versa makes this a
> >little different from the current implementations whe
On Tue, Jan 13, 2009 at 01:02:52PM +1030, Rusty Russell wrote:
> On Friday 09 January 2009 08:21:27 Ira Snyder wrote:
> > Rusty, since you wrote the virtio code, can you point me at the things I
> > would need to implement to use virtio over the PCI bus.
> >
> > The guests (PowerPC computers runni
On Friday 09 January 2009 08:21:27 Ira Snyder wrote:
> Rusty, since you wrote the virtio code, can you point me at the things I
> would need to implement to use virtio over the PCI bus.
>
> The guests (PowerPC computers running Linux) are PCI cards in the host
> system (an Intel Pentium3-M system)
On Sunday 11 January 2009, Benjamin Herrenschmidt wrote:
> On Thu, 2009-01-08 at 13:51 -0800, Ira Snyder wrote:
> > The guests (PowerPC computers running Linux) are PCI cards in the host
> > system (an Intel Pentium3-M system). The guest computers can access all
> > of the host's memory. The guests
On Thu, 2009-01-08 at 13:51 -0800, Ira Snyder wrote:
> The guests (PowerPC computers running Linux) are PCI cards in the host
> system (an Intel Pentium3-M system). The guest computers can access all
> of the host's memory. The guests provide a 1MB (movable) window into
> their memory.
>
> The Pow
On Thu, Jan 08, 2009 at 11:27:16AM -0800, Ira Snyder wrote:
> On Thu, Jan 08, 2009 at 11:16:10AM -0800, David Miller wrote:
> > From: Ira Snyder
> > Date: Wed, 7 Jan 2009 11:50:52 -0800
> >
> > > This adds support to Linux for a virtual ethernet interface which uses the
> > > PCI bus as its trans
On Thu, Jan 08, 2009 at 11:16:10AM -0800, David Miller wrote:
> From: Ira Snyder
> Date: Wed, 7 Jan 2009 11:50:52 -0800
>
> > This adds support to Linux for a virtual ethernet interface which uses the
> > PCI bus as its transport mechanism. It creates a simple, familiar, and fast
> > method of co
From: Ira Snyder
Date: Wed, 7 Jan 2009 11:50:52 -0800
> This adds support to Linux for a virtual ethernet interface which uses the
> PCI bus as its transport mechanism. It creates a simple, familiar, and fast
> method of communication for two devices connected by a PCI interface.
Well, it looks
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