On 11/30/2014 01:14 PM, Christoffer Dall wrote:

On Sun, Nov 23, 2014 at 07:35:54PM +0100, Eric Auger wrote:

quoted

Used by KVM-enabled VFIO-based device passthrough support in QEMU.

Signed-off-by: Joel Schopp <redacted>
Signed-off-by: Eric Auger <redacted>

---

Extracted from [RFC PATCH] arm64: KVM: add irqfd support
http://www.spinics.net/lists/kvm-arm/msg10798.html
---
 arch/arm64/kvm/Kconfig  | 1 +
 arch/arm64/kvm/Makefile | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kvm/Kconfig b/arch/arm64/kvm/Kconfig
index 09c25c2..2edf926 100644
--- a/arch/arm64/kvm/Kconfig
+++ b/arch/arm64/kvm/Kconfig

@@ -26,6 +26,7 @@ config KVM
 	select KVM_ARM_HOST
 	select KVM_ARM_VGIC
 	select KVM_ARM_TIMER
+	select KVM_VFIO
 	select HAVE_KVM_EVENTFD
 	---help---
 	  Support hosting virtualized guest machines.

diff --git a/arch/arm64/kvm/Makefile b/arch/arm64/kvm/Makefile
index 2e6b827..81ed091 100644
--- a/arch/arm64/kvm/Makefile
+++ b/arch/arm64/kvm/Makefile

@@ -11,7 +11,7 @@ ARM=../../../arch/arm/kvm
 
 obj-$(CONFIG_KVM_ARM_HOST) += kvm.o
 
-kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o
+kvm-$(CONFIG_KVM_ARM_HOST) += $(KVM)/kvm_main.o $(KVM)/coalesced_mmio.o $(KVM)/eventfd.o $(KVM)/vfio.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/arm.o $(ARM)/mmu.o $(ARM)/mmio.o
 kvm-$(CONFIG_KVM_ARM_HOST) += $(ARM)/psci.o $(ARM)/perf.o
 

-- 
1.9.1

Should these patches not be squashed into one?

Yes I can do.

Also, what do they enable at this point?  Should they be queued by the
end of the series instead?

Well to me this patch should be moved even outside of this series. The
KVM-VFIO device is loaded when the QEMU VFIO device is instantiated.
This is used to record the VFIO groups in use. In VFIO platform case, if
the KVM-VFIO device does not exist, this is not fatal but we get a
warning in QEMU.

The KVM-VFIO device however is mandatory to enable forwarded irq feature.

Best Regards

Eric

-Christoffer