[PATCH v4 08/12] KVM: arm64: connect LPIs to the VGIC emulation

[Chalamarla, Tirumalesh]

On 3/25/16, 7:14 PM, "kvmarm-bounces at lists.cs.columbia.edu on behalf of Andre Przywara" <kvmarm-bounces at lists.cs.columbia.edu on behalf of andre.przywara at arm.com> wrote:

>LPIs are dynamically created (mapped) at guest runtime and their
>actual numbers can be quite high, but is mostly assigned using a very
>sparse allocation scheme. So arrays are not an ideal data structure
>to hold the information. We use our equivalent of the "Interrupt
>Translation Table Entry" (ITTE) to hold the vgic_irq struct for a
>virtual LPI embedded in in the ITTE.
>Connect the VGIC core code via an accessor function to help it get the
>struct vgic_irq for a certain LPI.

Reviewed-by:Tirumalesh Chalamarla<tchalamarla at caviumnetworks.com>

>
>Signed-off-by: Andre Przywara <andre.przywara at arm.com>
>---
> virt/kvm/arm/vgic/its-emul.c | 29 +++++++++++++++++++++++++++++
> virt/kvm/arm/vgic/vgic.h     |  8 +++++++-
> 2 files changed, 36 insertions(+), 1 deletion(-)
>
>diff --git a/virt/kvm/arm/vgic/its-emul.c b/virt/kvm/arm/vgic/its-emul.c
>index c0334ff..1188e9a 100644
>--- a/virt/kvm/arm/vgic/its-emul.c
>+++ b/virt/kvm/arm/vgic/its-emul.c
>@@ -55,11 +55,29 @@ struct its_collection {
> struct its_itte {
> 	struct list_head itte_list;
> 
>+	struct vgic_irq irq;
> 	struct its_collection *collection;
> 	u32 lpi;
> 	u32 event_id;
> };
> 
>+/* To be used as an iterator this macro misses the enclosing parentheses */
>+#define for_each_lpi(dev, itte, kvm) \
>+	list_for_each_entry(dev, &(kvm)->arch.vgic.its.device_list, dev_list) \
>+		list_for_each_entry(itte, &(dev)->itt, itte_list)
>+
>+static struct its_itte *find_itte_by_lpi(struct kvm *kvm, int lpi)
>+{
>+	struct its_device *device;
>+	struct its_itte *itte;
>+
>+	for_each_lpi(device, itte, kvm) {
>+		if (itte->lpi == lpi)
>+			return itte;
>+	}
>+	return NULL;
>+}
>+
> #define BASER_BASE_ADDRESS(x) ((x) & 0xfffffffff000ULL)
> 
> static int vgic_mmio_read_its_ctlr(struct kvm_vcpu *vcpu,
>@@ -166,6 +184,17 @@ static int vgic_mmio_read_its_idregs(struct kvm_vcpu *vcpu,
> 	return 0;
> }
> 
>+struct vgic_irq *vgic_its_get_lpi(struct kvm *kvm, u32 intid)
>+{
>+	struct its_itte *itte;
>+
>+	itte = find_itte_by_lpi(kvm, intid);
>+	if (!itte)
>+		return NULL;
>+
>+	return &itte->irq;
>+}
>+
> static void its_free_itte(struct its_itte *itte)
> {
> 	list_del(&itte->itte_list);
>diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
>index 08f97d1..160c511 100644
>--- a/virt/kvm/arm/vgic/vgic.h
>+++ b/virt/kvm/arm/vgic/vgic.h
>@@ -63,6 +63,7 @@ int vgic_register_redist_regions(struct kvm *kvm, gpa_t dist_base_address);
> 
> int vits_init(struct kvm *kvm);
> void vgic_enable_lpis(struct kvm_vcpu *vcpu);
>+struct vgic_irq *vgic_its_get_lpi(struct kvm *kvm, u32 intid);
> void vits_destroy(struct kvm *kvm);
> #else
> static inline void vgic_v3_irq_change_affinity(struct kvm *kvm, u32 intid,
>@@ -129,7 +130,7 @@ static inline int vgic_register_redist_regions(struct kvm *kvm,
> 	return -ENODEV;
> }
> 
>-int vits_init(struct kvm *kvm)
>+static inline int vits_init(struct kvm *kvm)
> {
> 	return 0;
> }
>@@ -139,6 +140,11 @@ static inline void vgic_enable_lpis(struct kvm_vcpu *vcpu)
> 	return;
> }
> 
>+static inline struct vgic_irq *vgic_its_get_lpi(struct kvm *kvm, u32 intid)
>+{
>+	return NULL;
>+}
>+
> static inline void vits_destroy(struct kvm *kvm)
> {
> 	return;
>-- 
>2.7.3
>
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