[PATCH 03/10] KVM: arm-vgic: Set base addr through device API
Christoffer Dall
christoffer.dall at linaro.org
Thu Dec 12 14:55:42 EST 2013
Support setting the distributor and cpu interface base addresses in the
VM physical address space through the KVM_{SET,GET}_DEVICE_ATTR API
in addition to the ARM specific API.
This has the added benefit of being able to share more code in user
space and do things in a uniform manner.
Also deprecate the older API at the same time, but backwards
compatibility will be maintained.
Signed-off-by: Christoffer Dall <christoffer.dall at linaro.org>
---
Changelog[v4]:
- Move VGIC device control API defines to later patch where they are
used
- Remove unused variable declaration
Changelog[v3]:
- Spelling nits
- Fix error codes from vgic_get_attr
Changelog[v2]:
- None
Documentation/virtual/kvm/api.txt | 7 ++-
Documentation/virtual/kvm/devices/arm-vgic.txt | 11 ++++
arch/arm/include/uapi/asm/kvm.h | 2 +
arch/arm/kvm/arm.c | 2 +-
include/kvm/arm_vgic.h | 2 +-
virt/kvm/arm/vgic.c | 87 ++++++++++++++++++++++----
6 files changed, 96 insertions(+), 15 deletions(-)
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index a30035d..867112f 100644
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -2391,7 +2391,8 @@ struct kvm_reg_list {
This ioctl returns the guest registers that are supported for the
KVM_GET_ONE_REG/KVM_SET_ONE_REG calls.
-4.85 KVM_ARM_SET_DEVICE_ADDR
+
+4.85 KVM_ARM_SET_DEVICE_ADDR (deprecated)
Capability: KVM_CAP_ARM_SET_DEVICE_ADDR
Architectures: arm, arm64
@@ -2429,6 +2430,10 @@ must be called after calling KVM_CREATE_IRQCHIP, but before calling
KVM_RUN on any of the VCPUs. Calling this ioctl twice for any of the
base addresses will return -EEXIST.
+Note, this IOCTL is deprecated and the more flexible SET/GET_DEVICE_ATTR API
+should be used instead.
+
+
4.86 KVM_PPC_RTAS_DEFINE_TOKEN
Capability: KVM_CAP_PPC_RTAS
diff --git a/Documentation/virtual/kvm/devices/arm-vgic.txt b/Documentation/virtual/kvm/devices/arm-vgic.txt
index 38f27f7..c9febb2 100644
--- a/Documentation/virtual/kvm/devices/arm-vgic.txt
+++ b/Documentation/virtual/kvm/devices/arm-vgic.txt
@@ -8,3 +8,14 @@ Only one VGIC instance may be instantiated through either this API or the
legacy KVM_CREATE_IRQCHIP api. The created VGIC will act as the VM interrupt
controller, requiring emulated user-space devices to inject interrupts to the
VGIC instead of directly to CPUs.
+
+Groups:
+ KVM_DEV_ARM_VGIC_GRP_ADDR
+ Attributes:
+ KVM_VGIC_V2_ADDR_TYPE_DIST (rw, 64-bit)
+ Base address in the guest physical address space of the GIC distributor
+ register mappings.
+
+ KVM_VGIC_V2_ADDR_TYPE_CPU (rw, 64-bit)
+ Base address in the guest physical address space of the GIC virtual cpu
+ interface register mappings.
diff --git a/arch/arm/include/uapi/asm/kvm.h b/arch/arm/include/uapi/asm/kvm.h
index 835b867..76a7427 100644
--- a/arch/arm/include/uapi/asm/kvm.h
+++ b/arch/arm/include/uapi/asm/kvm.h
@@ -163,6 +163,8 @@ struct kvm_arch_memory_slot {
#define KVM_REG_ARM_VFP_FPINST 0x1009
#define KVM_REG_ARM_VFP_FPINST2 0x100A
+/* Device Control API: ARM VGIC */
+#define KVM_DEV_ARM_VGIC_GRP_ADDR 0
/* KVM_IRQ_LINE irq field index values */
#define KVM_ARM_IRQ_TYPE_SHIFT 24
diff --git a/arch/arm/kvm/arm.c b/arch/arm/kvm/arm.c
index cc7c41a..f290b22 100644
--- a/arch/arm/kvm/arm.c
+++ b/arch/arm/kvm/arm.c
@@ -776,7 +776,7 @@ static int kvm_vm_ioctl_set_device_addr(struct kvm *kvm,
case KVM_ARM_DEVICE_VGIC_V2:
if (!vgic_present)
return -ENXIO;
- return kvm_vgic_set_addr(kvm, type, dev_addr->addr);
+ return kvm_vgic_addr(kvm, type, &dev_addr->addr, true);
default:
return -ENODEV;
}
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 7e2d158..be85127 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -144,7 +144,7 @@ struct kvm_run;
struct kvm_exit_mmio;
#ifdef CONFIG_KVM_ARM_VGIC
-int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr);
+int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write);
int kvm_vgic_hyp_init(void);
int kvm_vgic_init(struct kvm *kvm);
int kvm_vgic_create(struct kvm *kvm);
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index b15d6c1..45db48d 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1495,6 +1495,12 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
{
int ret;
+ if (addr & ~KVM_PHYS_MASK)
+ return -E2BIG;
+
+ if (addr & (SZ_4K - 1))
+ return -EINVAL;
+
if (!IS_VGIC_ADDR_UNDEF(*ioaddr))
return -EEXIST;
if (addr + size < addr)
@@ -1507,26 +1513,41 @@ static int vgic_ioaddr_assign(struct kvm *kvm, phys_addr_t *ioaddr,
return ret;
}
-int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
+/**
+ * kvm_vgic_addr - set or get vgic VM base addresses
+ * @kvm: pointer to the vm struct
+ * @type: the VGIC addr type, one of KVM_VGIC_V2_ADDR_TYPE_XXX
+ * @addr: pointer to address value
+ * @write: if true set the address in the VM address space, if false read the
+ * address
+ *
+ * Set or get the vgic base addresses for the distributor and the virtual CPU
+ * interface in the VM physical address space. These addresses are properties
+ * of the emulated core/SoC and therefore user space initially knows this
+ * information.
+ */
+int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
{
int r = 0;
struct vgic_dist *vgic = &kvm->arch.vgic;
- if (addr & ~KVM_PHYS_MASK)
- return -E2BIG;
-
- if (addr & (SZ_4K - 1))
- return -EINVAL;
-
mutex_lock(&kvm->lock);
switch (type) {
case KVM_VGIC_V2_ADDR_TYPE_DIST:
- r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
- addr, KVM_VGIC_V2_DIST_SIZE);
+ if (write) {
+ r = vgic_ioaddr_assign(kvm, &vgic->vgic_dist_base,
+ *addr, KVM_VGIC_V2_DIST_SIZE);
+ } else {
+ *addr = vgic->vgic_dist_base;
+ }
break;
case KVM_VGIC_V2_ADDR_TYPE_CPU:
- r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
- addr, KVM_VGIC_V2_CPU_SIZE);
+ if (write) {
+ r = vgic_ioaddr_assign(kvm, &vgic->vgic_cpu_base,
+ *addr, KVM_VGIC_V2_CPU_SIZE);
+ } else {
+ *addr = vgic->vgic_cpu_base;
+ }
break;
default:
r = -ENODEV;
@@ -1538,16 +1559,58 @@ int kvm_vgic_set_addr(struct kvm *kvm, unsigned long type, u64 addr)
static int vgic_set_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
+ int r;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+ u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+ u64 addr;
+ unsigned long type = (unsigned long)attr->attr;
+
+ if (copy_from_user(&addr, uaddr, sizeof(addr)))
+ return -EFAULT;
+
+ r = kvm_vgic_addr(dev->kvm, type, &addr, true);
+ return (r == -ENODEV) ? -ENXIO : r;
+ }
+ }
+
return -ENXIO;
}
static int vgic_get_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
- return -ENXIO;
+ int r = -ENXIO;
+
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_ADDR: {
+ u64 __user *uaddr = (u64 __user *)(long)attr->addr;
+ u64 addr;
+ unsigned long type = (unsigned long)attr->attr;
+
+ r = kvm_vgic_addr(dev->kvm, type, &addr, false);
+ if (r)
+ return (r == -ENODEV) ? -ENXIO : r;
+
+ if (copy_to_user(uaddr, &addr, sizeof(addr)))
+ return -EFAULT;
+ }
+ }
+
+ return r;
}
static int vgic_has_attr(struct kvm_device *dev, struct kvm_device_attr *attr)
{
+ switch (attr->group) {
+ case KVM_DEV_ARM_VGIC_GRP_ADDR:
+ switch (attr->attr) {
+ case KVM_VGIC_V2_ADDR_TYPE_DIST:
+ case KVM_VGIC_V2_ADDR_TYPE_CPU:
+ return 0;
+ }
+ break;
+ }
return -ENXIO;
}
--
1.8.4.3
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