If the ITS modality is not available, let's simply support MSI
injection by transforming the MSI.data into an SPI ID.
This becomes possible to use KVM_SIGNAL_MSI ioctl and MSI
routing for arm too.
Signed-off-by: Eric Auger <eric.auger@xxxxxxxxxx>
---
v6 -> v7:
- move vgic_v2m_inject_msi into vgic-irqfd
v4 -> v5:
- on vgic_v2m_inject_msi check the msi->data is within the SPI range
- move KVM_HAVE_MSI in the KVM section (to be symetrical with ARM64)
v2 -> v3:
- reword the commit message
- add sanity check about devid provision
v1 -> v2:
- introduce vgic_v2m_inject_msi in vgic-v2-emul.c following Andre's
advice
---
arch/arm/kvm/Kconfig | 1 +
virt/kvm/arm/vgic/vgic-irqfd.c | 19 ++++++++++++++++++-
2 files changed, 19 insertions(+), 1 deletion(-)
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 3e1cd04..90d0176 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -34,6 +34,7 @@ config KVM
select HAVE_KVM_IRQFD
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
+ select HAVE_KVM_MSI
depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
---help---
Support hosting virtualized guest machines.
diff --git a/virt/kvm/arm/vgic/vgic-irqfd.c b/virt/kvm/arm/vgic/vgic-irqfd.c
index 4f0d7eb..28c96ad 100644
--- a/virt/kvm/arm/vgic/vgic-irqfd.c
+++ b/virt/kvm/arm/vgic/vgic-irqfd.c
@@ -77,6 +77,23 @@ out:
}
/**
+ * vgic_v2m_inject_msi: emulates GICv2M MSI injection by injecting
+ * the SPI ID matching the msi data
+ *
+ * @kvm: pointer to the kvm struct
+ * @msi: the msi struct handle
+ */
+static int vgic_v2m_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
+{
+ if (msi->flags & KVM_MSI_VALID_DEVID)
+ return -EINVAL;
+ if (!vgic_valid_spi(kvm, msi->data))
+ return -EINVAL;
+
+ return kvm_vgic_inject_irq(kvm, 0, msi->data, 1);
+}
+
+/**
* kvm_set_msi: inject the MSI corresponding to the
* MSI routing entry
*
@@ -96,7 +113,7 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
msi.devid = e->msi_devid;
if (!vgic_has_its(kvm))
- return -ENODEV;
+ return vgic_v2m_inject_msi(kvm, &msi);
return vgic_its_inject_msi(kvm, &msi);
}
--
1.9.1
--
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