From c3c918361adcceb816c92b21dd95d2b46fb96a8f Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Tue, 8 Jul 2014 12:09:04 +0100 Subject: arm/arm64: KVM: vgic: handle out-of-range MMIO accesses Now that we can (almost) dynamically size the number of interrupts, we're facing an interesting issue: We have to evaluate at runtime whether or not an access hits a valid register, based on the sizing of this particular instance of the distributor. Furthermore, the GIC spec says that accessing a reserved register is RAZ/WI. For this, add a new field to our range structure, indicating the number of bits a single interrupts uses. That allows us to find out whether or not the access is in range. Reviewed-by: Christoffer Dall Signed-off-by: Marc Zyngier --- include/kvm/arm_vgic.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/kvm') diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index 3b73d7845124..2767f939f47c 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -32,6 +32,7 @@ #define VGIC_V2_MAX_LRS (1 << 6) #define VGIC_V3_MAX_LRS 16 +#define VGIC_MAX_IRQS 1024 /* Sanity checks... */ #if (KVM_MAX_VCPUS > 8) @@ -42,7 +43,7 @@ #error "VGIC_NR_IRQS must be a multiple of 32" #endif -#if (VGIC_NR_IRQS > 1024) +#if (VGIC_NR_IRQS > VGIC_MAX_IRQS) #error "VGIC_NR_IRQS must be <= 1024" #endif -- cgit v1.2.3