in kernel irq_chip is enabled. It
provides more flexibility but is more complex, not sure if we need go
through that way.
Signed-off-by: Yunhong Jiang
---
drivers/vfio/pci/vfio_pci_intrs.c | 10 +-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci
On Mon, Oct 26, 2015 at 09:37:14PM -0600, Alex Williamson wrote:
> On Mon, 2015-10-26 at 18:20 -0700, Yunhong Jiang wrote:
> > An option to force VFIO PCI MSI/MSI-X handler as non-threaded IRQ,
> > even when CONFIG_IRQ_FORCED_THREADING=y. This is uselful when
> > assigning a d
On Tue, Oct 27, 2015 at 10:29:28AM +0100, Paolo Bonzini wrote:
>
>
> On 27/10/2015 07:35, Yunhong Jiang wrote:
> > On Mon, Oct 26, 2015 at 09:37:14PM -0600, Alex Williamson wrote:
> >> On Mon, 2015-10-26 at 18:20 -0700, Yunhong Jiang wrote:
> >>> An option to
On Wed, Oct 28, 2015 at 01:44:55AM +0100, Paolo Bonzini wrote:
>
>
> On 27/10/2015 22:26, Yunhong Jiang wrote:
> >> > On RT kernels however can you call eventfd_signal from interrupt
> >> > context? You cannot call spin_lock_irqsave (which can sleep) from a
>
On Wed, Oct 28, 2015 at 12:18:48PM -0600, Alex Williamson wrote:
> On Wed, 2015-10-28 at 10:50 -0700, Yunhong Jiang wrote:
> > On Wed, Oct 28, 2015 at 01:44:55AM +0100, Paolo Bonzini wrote:
>
> It's in linux-next via the kvm.git next branch:
>
> git://git.kernel.or
On Thu, Oct 29, 2015 at 10:45:44AM +0100, Paolo Bonzini wrote:
>
>
> On 29/10/2015 04:11, Alex Williamson wrote:
> > > The irqfd is already able to schedule a work item, because it runs with
> > > interrupts disabled, so I think we can always return IRQ_HANDLED.
> >
> > I'm confused by this. The
The x86 support setting irq in atomic, expose it to vfio driver.
Signed-off-by: Yunhong Jiang
---
arch/x86/kvm/Kconfig | 1 +
include/linux/kvm_host.h | 19 ---
virt/kvm/Kconfig | 3 +++
virt/kvm/eventfd.c | 9 -
4 files changed, 20 insertions(+), 12
interrupt at hard interrupt
context. The producer will invoke the consumer's handler then.
Yunhong Jiang (5):
Extract the irqfd_wakeup_pollin/irqfd_wakeup_pollup
Support runtime irq_bypass consumer
Support threaded interrupt handling on VFIO
Add the irq handling consumer
Expos
Add an irq_bypass consumer to the KVM eventfd, so that when a MSI interrupt
happens and triggerred from VFIO, it can be handled fast.
Signed-off-by: Yunhong Jiang
---
include/linux/kvm_irqfd.h | 1 +
virt/kvm/eventfd.c| 42 ++
2 files changed, 43
updated to support both static consumer (like for
Posted Interrupt consumer) and runtime consumer.
Signed-off-by: Yunhong Jiang
---
include/linux/irqbypass.h | 8 +
virt/lib/irqbypass.c | 82 +++
2 files changed, 69 insertions(+), 21 deletion
Separate the irqfd_wakeup_pollin/irqfd_wakeup_pollup from the
irqfd_wakeup, so that we can reuse the logic for MSI fastpath injection.
Signed-off-by: Yunhong Jiang
---
virt/kvm/eventfd.c | 86 --
1 file changed, 51 insertions(+), 35 deletions
For VFIO device with MSI interrupt type, it's possible to handle the
interrupt on hard interrupt context without invoking the interrupt
thread. Handling the interrupt on hard interrupt context reduce the
interrupt latency.
Signed-off-by: Yunhong Jiang
---
drivers/vfio/pci/vfio_pci_intrs.c
On Thu, Dec 03, 2015 at 11:55:53AM -0700, Alex Williamson wrote:
> On Thu, 2015-12-03 at 10:22 -0800, Yunhong Jiang wrote:
> > When assigning a VFIO device to a KVM guest with low latency requirement,
> > it
> > is better to handle the interrupt in the hard interrupt contex
fast_IRQ.
Thanks
--jyh
> still need the srcu code added here to protect against registration and
> irq_handler() races. Thanks,
>
> Alex
>
> > On 03/12/2015 19:22, Yunhong Jiang wrote:
> > > When assigning a VFIO device to a KVM guest with low latency
> > > requi
On Wed, Dec 16, 2015 at 10:55:12PM +0100, Paolo Bonzini wrote:
>
>
> On 16/12/2015 20:15, Alex Williamson wrote:
> > The consumers would be, for instance, Intel PI + the threaded handler
> > added in this series. These run independently, the PI bypass simply
> > makes the interrupt disappear fro
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