[PATCH v10 5/8] arm/arm64: vgic: Introduce VENG0 and VENG1 fields to vmcr struct

[vijay.kilari at gmail.com]

From: Vijaya Kumar K <Vijaya.Kumar at cavium.com>

ICC_VMCR_EL2 supports virtual access to ICC_IGRPEN1_EL1.Enable
and ICC_IGRPEN0_EL1.Enable fields. Add grpen0 and grpen1 member
variables to struct vmcr to support read and write of these fields.

Also refactor vgic_set_vmcr and vgic_get_vmcr() code.
Drop ICH_VMCR_CTLR_SHIFT and ICH_VMCR_CTLR_MASK macros and instead
use ICH_VMCR_EOI* and ICH_VMCR_CBPR* macros.

Signed-off-by: Vijaya Kumar K <Vijaya.Kumar at cavium.com>
Reviewed-by: Christoffer Dall <christoffer.dall at linaro.org>
---
 include/linux/irqchip/arm-gic-v3.h |  2 --
 virt/kvm/arm/vgic/vgic-mmio-v2.c   | 16 ----------------
 virt/kvm/arm/vgic/vgic-mmio.c      | 16 ++++++++++++++++
 virt/kvm/arm/vgic/vgic-v3.c        | 20 ++++++++++++++++++--
 virt/kvm/arm/vgic/vgic.h           |  5 +++++
 5 files changed, 39 insertions(+), 20 deletions(-)

diff --git a/include/linux/irqchip/arm-gic-v3.h b/include/linux/irqchip/arm-gic-v3.h
index b4f8287..406fc3e 100644
--- a/include/linux/irqchip/arm-gic-v3.h
+++ b/include/linux/irqchip/arm-gic-v3.h
@@ -404,8 +404,6 @@
 #define ICH_HCR_EN			(1 << 0)
 #define ICH_HCR_UIE			(1 << 1)
 
-#define ICH_VMCR_CTLR_SHIFT		0
-#define ICH_VMCR_CTLR_MASK		(0x21f << ICH_VMCR_CTLR_SHIFT)
 #define ICH_VMCR_CBPR_SHIFT		4
 #define ICH_VMCR_CBPR_MASK		(1 << ICH_VMCR_CBPR_SHIFT)
 #define ICH_VMCR_EOIM_SHIFT		9
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
index 2cb04b7..ad353b5 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
@@ -212,22 +212,6 @@ static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
 	}
 }
 
-static void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
-{
-	if (kvm_vgic_global_state.type == VGIC_V2)
-		vgic_v2_set_vmcr(vcpu, vmcr);
-	else
-		vgic_v3_set_vmcr(vcpu, vmcr);
-}
-
-static void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
-{
-	if (kvm_vgic_global_state.type == VGIC_V2)
-		vgic_v2_get_vmcr(vcpu, vmcr);
-	else
-		vgic_v3_get_vmcr(vcpu, vmcr);
-}
-
 #define GICC_ARCH_VERSION_V2	0x2
 
 /* These are for userland accesses only, there is no guest-facing emulation. */
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c
index 0d1bc98..f81e0e5 100644
--- a/virt/kvm/arm/vgic/vgic-mmio.c
+++ b/virt/kvm/arm/vgic/vgic-mmio.c
@@ -416,6 +416,22 @@ int vgic_validate_mmio_region_addr(struct kvm_device *dev,
 	return -ENXIO;
 }
 
+void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_set_vmcr(vcpu, vmcr);
+	else
+		vgic_v3_set_vmcr(vcpu, vmcr);
+}
+
+void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr)
+{
+	if (kvm_vgic_global_state.type == VGIC_V2)
+		vgic_v2_get_vmcr(vcpu, vmcr);
+	else
+		vgic_v3_get_vmcr(vcpu, vmcr);
+}
+
 /*
  * kvm_mmio_read_buf() returns a value in a format where it can be converted
  * to a byte array and be directly observed as the guest wanted it to appear
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index 9f0dae3..c21968b 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -175,10 +175,18 @@ void vgic_v3_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 {
 	u32 vmcr;
 
-	vmcr  = (vmcrp->ctlr << ICH_VMCR_CTLR_SHIFT) & ICH_VMCR_CTLR_MASK;
+	/*
+	 * Ignore the FIQen bit, because GIC emulation always implies
+	 * SRE=1 which means the vFIQEn bit is also RES1.
+	 */
+	vmcr = ((vmcrp->ctlr >> ICC_CTLR_EL1_EOImode_SHIFT) <<
+		 ICH_VMCR_EOIM_SHIFT) & ICH_VMCR_EOIM_MASK;
+	vmcr |= (vmcrp->ctlr << ICH_VMCR_CBPR_SHIFT) & ICH_VMCR_CBPR_MASK;
 	vmcr |= (vmcrp->abpr << ICH_VMCR_BPR1_SHIFT) & ICH_VMCR_BPR1_MASK;
 	vmcr |= (vmcrp->bpr << ICH_VMCR_BPR0_SHIFT) & ICH_VMCR_BPR0_MASK;
 	vmcr |= (vmcrp->pmr << ICH_VMCR_PMR_SHIFT) & ICH_VMCR_PMR_MASK;
+	vmcr |= (vmcrp->grpen0 << ICH_VMCR_ENG0_SHIFT) & ICH_VMCR_ENG0_MASK;
+	vmcr |= (vmcrp->grpen1 << ICH_VMCR_ENG1_SHIFT) & ICH_VMCR_ENG1_MASK;
 
 	vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr = vmcr;
 }
@@ -187,10 +195,18 @@ void vgic_v3_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcrp)
 {
 	u32 vmcr = vcpu->arch.vgic_cpu.vgic_v3.vgic_vmcr;
 
-	vmcrp->ctlr = (vmcr & ICH_VMCR_CTLR_MASK) >> ICH_VMCR_CTLR_SHIFT;
+	/*
+	 * Ignore the FIQen bit, because GIC emulation always implies
+	 * SRE=1 which means the vFIQEn bit is also RES1.
+	 */
+	vmcrp->ctlr = ((vmcr >> ICH_VMCR_EOIM_SHIFT) <<
+			ICC_CTLR_EL1_EOImode_SHIFT) & ICC_CTLR_EL1_EOImode_MASK;
+	vmcrp->ctlr |= (vmcr & ICH_VMCR_CBPR_MASK) >> ICH_VMCR_CBPR_SHIFT;
 	vmcrp->abpr = (vmcr & ICH_VMCR_BPR1_MASK) >> ICH_VMCR_BPR1_SHIFT;
 	vmcrp->bpr  = (vmcr & ICH_VMCR_BPR0_MASK) >> ICH_VMCR_BPR0_SHIFT;
 	vmcrp->pmr  = (vmcr & ICH_VMCR_PMR_MASK) >> ICH_VMCR_PMR_SHIFT;
+	vmcrp->grpen0 = (vmcr & ICH_VMCR_ENG0_MASK) >> ICH_VMCR_ENG0_SHIFT;
+	vmcrp->grpen1 = (vmcr & ICH_VMCR_ENG1_MASK) >> ICH_VMCR_ENG1_SHIFT;
 }
 
 #define INITIAL_PENDBASER_VALUE						  \
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 91f58b2..9232791 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -78,6 +78,9 @@ struct vgic_vmcr {
 	u32	abpr;
 	u32	bpr;
 	u32	pmr;
+	/* Below member variable are valid only for GICv3 */
+	u32	grpen0;
+	u32	grpen1;
 };
 
 struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
@@ -138,6 +141,8 @@ int vgic_v3_dist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 			 int offset, u32 *val);
 int kvm_register_vgic_device(unsigned long type);
+void vgic_set_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
+void vgic_get_vmcr(struct kvm_vcpu *vcpu, struct vgic_vmcr *vmcr);
 int vgic_lazy_init(struct kvm *kvm);
 int vgic_init(struct kvm *kvm);
 
-- 
1.9.1