[PATCH 16/31] KVM: arm64: vgic-v3: Add ICV_HPPIR1_EL1 handler

Marc Zyngier
2017-05-03T10:43:40Z

Add a handler for reading the guest's view of the ICV_HPPIR1_EL1
register. This is a simple parsing of the available LRs, extracting the
highest available interrupt.

Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
---
arch/arm64/include/asm/sysreg.h | 1 +
virt/kvm/arm/hyp/vgic-v3-sr.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h
index aad46b8eea5e..bd000686194a 100644
--- a/arch/arm64/include/asm/sysreg.h
+++ b/arch/arm64/include/asm/sysreg.h
@@ -185,6 +185,7 @@
#define SYS_ICC_SGI1R_EL1 sys_reg(3, 0, 12, 11, 5)
#define SYS_ICC_IAR1_EL1 sys_reg(3, 0, 12, 12, 0)
#define SYS_ICC_EOIR1_EL1 sys_reg(3, 0, 12, 12, 1)
+#define SYS_ICC_HPPIR1_EL1 sys_reg(3, 0, 12, 12, 2)
#define SYS_ICC_BPR1_EL1 sys_reg(3, 0, 12, 12, 3)
#define SYS_ICC_CTLR_EL1 sys_reg(3, 0, 12, 12, 4)
#define SYS_ICC_SRE_EL1 sys_reg(3, 0, 12, 12, 5)
diff --git a/virt/kvm/arm/hyp/vgic-v3-sr.c b/virt/kvm/arm/hyp/vgic-v3-sr.c
index b6803989da1f..a521e105ade1 100644
--- a/virt/kvm/arm/hyp/vgic-v3-sr.c
+++ b/virt/kvm/arm/hyp/vgic-v3-sr.c
@@ -754,6 +754,26 @@ static void __hyp_text __vgic_v3_write_apxr3(struct kvm_vcpu *vcpu,
__vgic_v3_write_apxrn(vcpu, rt, 3);
}

+static void __hyp_text __vgic_v3_read_hppir(struct kvm_vcpu *vcpu,
+ u32 vmcr, int rt)
+{
+ u64 lr_val;
+ int lr, lr_grp, grp;
+
+ grp = __vgic_v3_get_group(vcpu);
+
+ lr = __vgic_v3_highest_priority_lr(vcpu, vmcr, &lr_val);
+ if (lr == -1)
+ goto spurious;
+
+ lr_grp = !!(lr_val & ICH_LR_GROUP);
+ if (lr_grp != grp)
+ lr_val = ICC_IAR1_EL1_SPURIOUS;
+
+spurious:
+ vcpu_set_reg(vcpu, rt, lr_val & ICH_LR_VIRTUAL_ID_MASK);
+}
+
int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
{
int rt = kvm_vcpu_sys_get_rt(vcpu);
@@ -816,6 +836,9 @@ int __hyp_text __vgic_v3_perform_cpuif_access(struct kvm_vcpu *vcpu)
else
fn = __vgic_v3_write_apxr3;
break;
+ case SYS_ICC_HPPIR1_EL1:
+ fn = __vgic_v3_read_hppir;
+ break;
default:
return 0;
}
--
2.11.0