[RFC PATCH v1 20/26] xen/arm: vgic-v3: expose SGI emulation for Realm exits

[Koichiro Den <den@xxxxxxxxxxxxx>]

Expose the GICv3 SGI decoder so Realm sysreg exits can reuse Xen's
normal ICC_SGI1R_EL1 handling.

Signed-off-by: Koichiro Den <den@xxxxxxxxxxxxx>
---
 xen/arch/arm/include/asm/vgic.h | 10 ++++++++++
 xen/arch/arm/vgic-v3.c          |  4 +++-
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/include/asm/vgic.h b/xen/arch/arm/include/asm/vgic.h
index 6f9ab1c98c1c..93f5e3ba40fc 100644
--- a/xen/arch/arm/include/asm/vgic.h
+++ b/xen/arch/arm/include/asm/vgic.h
@@ -336,6 +336,9 @@ extern void vgic_set_irqs_pending(struct vcpu *v, uint32_t 
r,
 extern void register_vgic_ops(struct domain *d, const struct vgic_ops *ops);
 int vgic_v2_init(struct domain *d, unsigned int *mmio_count);
 int vgic_v3_init(struct domain *d, unsigned int *mmio_count);
+#ifdef CONFIG_GICV3
+bool vgic_v3_to_sgi(struct vcpu *v, uint64_t sgir);
+#endif
 
 extern bool vgic_to_sgi(struct vcpu *v, register_t sgir,
                         enum gic_sgi_mode irqmode, int virq,
@@ -346,6 +349,13 @@ extern void vgic_check_inflight_irqs_pending(struct vcpu 
*v,
 
 #endif /* !CONFIG_NEW_VGIC */
 
+#if defined(CONFIG_NEW_VGIC) || !defined(CONFIG_GICV3)
+static inline bool vgic_v3_to_sgi(struct vcpu *v, uint64_t sgir)
+{
+    return false;
+}
+#endif
+
 /*** Common VGIC functions used by Xen arch code ****/
 
 /*
diff --git a/xen/arch/arm/vgic-v3.c b/xen/arch/arm/vgic-v3.c
index 77517c303061..9cb1495bba97 100644
--- a/xen/arch/arm/vgic-v3.c
+++ b/xen/arch/arm/vgic-v3.c
@@ -1600,13 +1600,15 @@ write_reserved:
     return 1;
 }
 
-static bool vgic_v3_to_sgi(struct vcpu *v, uint64_t sgir)
+bool vgic_v3_to_sgi(struct vcpu *v, uint64_t sgir)
 {
     int virq;
     int irqmode;
     enum gic_sgi_mode sgi_mode;
     struct sgi_target target;
 
+    ASSERT(v == current);
+
     sgi_target_init(&target);
     irqmode = (sgir >> ICH_SGI_IRQMODE_SHIFT) & ICH_SGI_IRQMODE_MASK;
     virq = (sgir >> ICH_SGI_IRQ_SHIFT ) & ICH_SGI_IRQ_MASK;
-- 
2.51.0