On Thursday 11 March 2010, Avi Kivity wrote:
A totally different option that avoids this whole problem would
be to separate the signalling from the shared memory, making the
PCI shared memory device a trivial device with a single memory BAR,
and using something a higher-level concept like
On 03/11/2010 02:57 PM, Arnd Bergmann wrote:
On Thursday 11 March 2010, Avi Kivity wrote:
A totally different option that avoids this whole problem would
be to separate the signalling from the shared memory, making the
PCI shared memory device a trivial device with a single memory BAR,
and
On Thursday 11 March 2010, Avi Kivity wrote:
That would be much slower. The current scheme allows for an
ioeventfd/irqfd short circuit which allows one guest to interrupt
another without involving their qemus at all.
Yes, the serial line approach would be much slower, but my point
On 03/09/2010 08:34 PM, Cam Macdonell wrote:
On Tue, Mar 9, 2010 at 10:28 AM, Avi Kivitya...@redhat.com wrote:
On 03/09/2010 05:27 PM, Cam Macdonell wrote:
Registers are used
for synchronization between guests sharing the same memory object when
interrupts are
On Tuesday 09 March 2010, Cam Macdonell wrote:
We could make the masking in RAM, not in registers, like virtio, which would
require no exits. It would then be part of the application specific
protocol and out of scope of of this spec.
This kind of implementation would be possible now
On Wed, Mar 10, 2010 at 2:21 AM, Avi Kivity a...@redhat.com wrote:
On 03/09/2010 08:34 PM, Cam Macdonell wrote:
On Tue, Mar 9, 2010 at 10:28 AM, Avi Kivitya...@redhat.com wrote:
On 03/09/2010 05:27 PM, Cam Macdonell wrote:
Registers are used
for synchronization between guests
On 03/10/2010 06:36 PM, Cam Macdonell wrote:
On Wed, Mar 10, 2010 at 2:21 AM, Avi Kivitya...@redhat.com wrote:
On 03/09/2010 08:34 PM, Cam Macdonell wrote:
On Tue, Mar 9, 2010 at 10:28 AM, Avi Kivitya...@redhat.comwrote:
On 03/09/2010 05:27 PM, Cam Macdonell wrote:
On 03/10/2010 04:04 PM, Arnd Bergmann wrote:
On Tuesday 09 March 2010, Cam Macdonell wrote:
We could make the masking in RAM, not in registers, like virtio, which would
require no exits. It would then be part of the application specific
protocol and out of scope of of this spec.
On Monday 08 March 2010, Cam Macdonell wrote:
enum ivshmem_registers {
IntrMask = 0,
IntrStatus = 2,
Doorbell = 4,
IVPosition = 6,
IVLiveList = 8
};
The first two registers are the interrupt mask and status registers.
Interrupts are triggered when a message is
On 03/08/2010 07:57 PM, Cam Macdonell wrote:
Can you provide a spec that describes the device? This would be useful for
maintaining the code, writing guest drivers, and as a framework for review.
I'm not sure if you want the Qemu command-line part as part of the
spec here, but I've
On 03/09/2010 02:49 PM, Arnd Bergmann wrote:
On Monday 08 March 2010, Cam Macdonell wrote:
enum ivshmem_registers {
IntrMask = 0,
IntrStatus = 2,
Doorbell = 4,
IVPosition = 6,
IVLiveList = 8
};
The first two registers are the interrupt mask and status registers.
On Tue, Mar 9, 2010 at 6:03 AM, Avi Kivity a...@redhat.com wrote:
On 03/09/2010 02:49 PM, Arnd Bergmann wrote:
On Monday 08 March 2010, Cam Macdonell wrote:
enum ivshmem_registers {
IntrMask = 0,
IntrStatus = 2,
Doorbell = 4,
IVPosition = 6,
IVLiveList = 8
};
The
On 03/09/2010 05:27 PM, Cam Macdonell wrote:
Registers are used
for synchronization between guests sharing the same memory object when
interrupts are supported (this requires using the shared memory server).
How does the driver detect whether interrupts are supported or not?
On 03/09/2010 11:28 AM, Avi Kivity wrote:
On 03/09/2010 05:27 PM, Cam Macdonell wrote:
Registers are used
for synchronization between guests sharing the same memory object when
interrupts are supported (this requires using the shared memory
server).
How does the driver detect whether
On Tue, Mar 9, 2010 at 10:28 AM, Avi Kivity a...@redhat.com wrote:
On 03/09/2010 05:27 PM, Cam Macdonell wrote:
Registers are used
for synchronization between guests sharing the same memory object when
interrupts are supported (this requires using the shared memory server).
How does the
On 03/06/2010 01:52 AM, Cam Macdonell wrote:
Support an inter-vm shared memory device that maps a shared-memory object
as a PCI device in the guest. This patch also supports interrupts between
guest by communicating over a unix domain socket. This patch applies to the
qemu-kvm repository.
On Mon, Mar 8, 2010 at 2:56 AM, Avi Kivity a...@redhat.com wrote:
On 03/06/2010 01:52 AM, Cam Macdonell wrote:
Support an inter-vm shared memory device that maps a shared-memory object
as a PCI device in the guest. This patch also supports interrupts between
guest by communicating over a
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