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.au...@linaro.org>
---
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-v2-emul.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)
diff --git a/arch/arm/kvm/Kconfig b/arch/arm/kvm/Kconfig
index 151e710..0f58baf 100644
--- a/arch/arm/kvm/Kconfig
+++ b/arch/arm/kvm/Kconfig
@@ -31,6 +31,7 @@ config KVM
select KVM_VFIO
select HAVE_KVM_EVENTFD
select HAVE_KVM_IRQFD
+ select HAVE_KVM_MSI
select HAVE_KVM_IRQCHIP
select HAVE_KVM_IRQ_ROUTING
depends on ARM_VIRT_EXT && ARM_LPAE && ARM_ARCH_TIMER
diff --git a/virt/kvm/arm/vgic-v2-emul.c b/virt/kvm/arm/vgic-v2-emul.c
index 8faa28c..ba2b393 100644
--- a/virt/kvm/arm/vgic-v2-emul.c
+++ b/virt/kvm/arm/vgic-v2-emul.c
@@ -478,6 +478,21 @@ static bool vgic_v2_queue_sgi(struct kvm_vcpu *vcpu, int
irq)
}
/**
+ * 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;
+
+ return kvm_vgic_inject_irq(kvm, 0, msi->data, 1);
+}
+
+/**
* kvm_vgic_map_resources - Configure global VGIC state before running any
VCPUs
* @kvm: pointer to the kvm struct
*
@@ -566,6 +581,7 @@ void vgic_v2_init_emulation(struct kvm *kvm)
dist->vm_ops.add_sgi_source = vgic_v2_add_sgi_source;
dist->vm_ops.init_model = vgic_v2_init_model;
dist->vm_ops.map_resources = vgic_v2_map_resources;
+ dist->vm_ops.inject_msi = vgic_v2m_inject_msi;
dist->vgic_cpu_base = VGIC_ADDR_UNDEF;
dist->vgic_dist_base = VGIC_ADDR_UNDEF;
--
1.9.1
--
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