KVM: arm64: vgic-v3: Use u32 to manage the line level from userspace

Despite the userspace ABI clearly defining the bits dealt with by
KVM_DEV_ARM_VGIC_GRP_LEVEL_INFO as a __u32, the kernel uses a u64.

Use a u32 to match the userspace ABI, which will subsequently lead
to some simplifications.

Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>

diff --git a/arch/arm64/kvm/vgic/vgic-kvm-device.c b/arch/arm64/kvm/vgic/vgic-kvm-device.c
index bf745c6..f02294b 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-kvm-device.c
+++ b/arch/arm64/kvm/vgic/vgic-kvm-device.c
@@ -570,10 +570,14 @@ static int vgic_v3_attr_regs_access(struct kvm_device *dev,
                info = (attr->attr & KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_MASK) >>
                        KVM_DEV_ARM_VGIC_LINE_LEVEL_INFO_SHIFT;
                if (info == VGIC_LEVEL_INFO_LINE_LEVEL) {
+                       if (is_write)
+                               tmp32 = *reg;
                        intid = attr->attr &
                                KVM_DEV_ARM_VGIC_LINE_LEVEL_INTID_MASK;
                        ret = vgic_v3_line_level_info_uaccess(vcpu, is_write,
-                                                             intid, reg);
+                                                             intid, &tmp32);
+                       if (!is_write)
+                               *reg = tmp32;
                } else {
                        ret = -EINVAL;
                }

diff --git a/arch/arm64/kvm/vgic/vgic-mmio-v3.c b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
index a2ff738..91201f7 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-mmio-v3.c
+++ b/arch/arm64/kvm/vgic/vgic-mmio-v3.c
@@ -1154,7 +1154,7 @@ int vgic_v3_redist_uaccess(struct kvm_vcpu *vcpu, bool is_write,
 }
 
 int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
-                                   u32 intid, u64 *val)
+                                   u32 intid, u32 *val)
 {
        if (intid % 32)
                return -EINVAL;

diff --git a/arch/arm64/kvm/vgic/vgic-mmio.c b/arch/arm64/kvm/vgic/vgic-mmio.c
index 997d0fc..b32d434 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-mmio.c
+++ b/arch/arm64/kvm/vgic/vgic-mmio.c
@@ -775,10 +775,10 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
        }
 }
 
-u64 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid)
+u32 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid)
 {
        int i;
-       u64 val = 0;
+       u32 val = 0;
        int nr_irqs = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
 
        for (i = 0; i < 32; i++) {
@@ -798,7 +798,7 @@ u64 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid)
 }
 
 void vgic_write_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid,
-                                   const u64 val)
+                                   const u32 val)
 {
        int i;
        int nr_irqs = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;

diff --git a/arch/arm64/kvm/vgic/vgic-mmio.h b/arch/arm64/kvm/vgic/vgic-mmio.h
index 6082d4b..5b490a4 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic-mmio.h
+++ b/arch/arm64/kvm/vgic/vgic-mmio.h
@@ -207,10 +207,10 @@ void vgic_mmio_write_config(struct kvm_vcpu *vcpu,
 int vgic_uaccess(struct kvm_vcpu *vcpu, struct vgic_io_device *dev,
                 bool is_write, int offset, u32 *val);
 
-u64 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid);
+u32 vgic_read_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid);
 
 void vgic_write_irq_line_level_info(struct kvm_vcpu *vcpu, u32 intid,
-                                   const u64 val);
+                                   const u32 val);
 
 unsigned int vgic_v2_init_dist_iodev(struct vgic_io_device *dev);
 

diff --git a/arch/arm64/kvm/vgic/vgic.h b/arch/arm64/kvm/vgic/vgic.h
index c231184..0c8da72 100644 (file)
--- a/arch/arm64/kvm/vgic/vgic.h
+++ b/arch/arm64/kvm/vgic/vgic.h
@@ -249,7 +249,7 @@ int vgic_v3_cpu_sysregs_uaccess(struct kvm_vcpu *vcpu,
                                struct kvm_device_attr *attr, bool is_write);
 int vgic_v3_has_cpu_sysregs_attr(struct kvm_vcpu *vcpu, struct kvm_device_attr *attr);
 int vgic_v3_line_level_info_uaccess(struct kvm_vcpu *vcpu, bool is_write,
-                                   u32 intid, u64 *val);
+                                   u32 intid, 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);