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authorChristoffer Dall <christoffer.dall@linaro.org>2013-09-23 14:55:57 -0700
committerChristoffer Dall <christoffer.dall@linaro.org>2013-12-21 10:02:10 -0800
commitfa20f5aea56f271f83e91b9cde00f043a5a14990 (patch)
treeeb547e3490340335770449ad81d13b9c9f0e5031 /virt
parent90a5355ee7639e92c0492ec592cba5c31bd80687 (diff)
downloadlinux-fa20f5aea56f271f83e91b9cde00f043a5a14990.tar.gz
KVM: arm-vgic: Support CPU interface reg access
Implement support for the CPU interface register access driven by MMIO address offsets from the CPU interface base address. Useful for user space to support save/restore of the VGIC state. This commit adds support only for the same logic as the current VGIC support, and no more. For example, the active priority registers are handled as RAZ/WI, just like setting priorities on the emulated distributor. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic.c81
1 files changed, 73 insertions, 8 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index e59aaa4c64e..be456ce264d 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -71,6 +71,10 @@
#define VGIC_ADDR_UNDEF (-1)
#define IS_VGIC_ADDR_UNDEF(_x) ((_x) == VGIC_ADDR_UNDEF)
+#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
+#define IMPLEMENTER_ARM 0x43b
+#define GICC_ARCH_VERSION_V2 0x2
+
/* Physical address of vgic virtual cpu interface */
static phys_addr_t vgic_vcpu_base;
@@ -312,7 +316,7 @@ static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
u32 word_offset = offset & 3;
switch (offset & ~3) {
- case 0: /* CTLR */
+ case 0: /* GICD_CTLR */
reg = vcpu->kvm->arch.vgic.enabled;
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_VALUE);
@@ -323,15 +327,15 @@ static bool handle_mmio_misc(struct kvm_vcpu *vcpu,
}
break;
- case 4: /* TYPER */
+ case 4: /* GICD_TYPER */
reg = (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
reg |= (VGIC_NR_IRQS >> 5) - 1;
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
break;
- case 8: /* IIDR */
- reg = 0x4B00043B;
+ case 8: /* GICD_IIDR */
+ reg = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
vgic_reg_access(mmio, &reg, word_offset,
ACCESS_READ_VALUE | ACCESS_WRITE_IGNORED);
break;
@@ -1716,9 +1720,70 @@ int kvm_vgic_addr(struct kvm *kvm, unsigned long type, u64 *addr, bool write)
static bool handle_cpu_mmio_misc(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio, phys_addr_t offset)
{
- return true;
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ u32 reg, mask = 0, shift = 0;
+ bool updated = false;
+
+ switch (offset & ~0x3) {
+ case GIC_CPU_CTRL:
+ mask = GICH_VMCR_CTRL_MASK;
+ shift = GICH_VMCR_CTRL_SHIFT;
+ break;
+ case GIC_CPU_PRIMASK:
+ mask = GICH_VMCR_PRIMASK_MASK;
+ shift = GICH_VMCR_PRIMASK_SHIFT;
+ break;
+ case GIC_CPU_BINPOINT:
+ mask = GICH_VMCR_BINPOINT_MASK;
+ shift = GICH_VMCR_BINPOINT_SHIFT;
+ break;
+ case GIC_CPU_ALIAS_BINPOINT:
+ mask = GICH_VMCR_ALIAS_BINPOINT_MASK;
+ shift = GICH_VMCR_ALIAS_BINPOINT_SHIFT;
+ break;
+ }
+
+ if (!mmio->is_write) {
+ reg = (vgic_cpu->vgic_vmcr & mask) >> shift;
+ mmio_data_write(mmio, ~0, reg);
+ } else {
+ reg = mmio_data_read(mmio, ~0);
+ reg = (reg << shift) & mask;
+ if (reg != (vgic_cpu->vgic_vmcr & mask))
+ updated = true;
+ vgic_cpu->vgic_vmcr &= ~mask;
+ vgic_cpu->vgic_vmcr |= reg;
+ }
+ return updated;
+}
+
+static bool handle_mmio_abpr(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio, phys_addr_t offset)
+{
+ return handle_cpu_mmio_misc(vcpu, mmio, GIC_CPU_ALIAS_BINPOINT);
}
+static bool handle_cpu_mmio_ident(struct kvm_vcpu *vcpu,
+ struct kvm_exit_mmio *mmio,
+ phys_addr_t offset)
+{
+ u32 reg;
+
+ if (mmio->is_write)
+ return false;
+
+ /* GICC_IIDR */
+ reg = (PRODUCT_ID_KVM << 20) |
+ (GICC_ARCH_VERSION_V2 << 16) |
+ (IMPLEMENTER_ARM << 0);
+ mmio_data_write(mmio, ~0, reg);
+ return false;
+}
+
+/*
+ * CPU Interface Register accesses - these are not accessed by the VM, but by
+ * user space for saving and restoring VGIC state.
+ */
static const struct mmio_range vgic_cpu_ranges[] = {
{
.base = GIC_CPU_CTRL,
@@ -1728,17 +1793,17 @@ static const struct mmio_range vgic_cpu_ranges[] = {
{
.base = GIC_CPU_ALIAS_BINPOINT,
.len = 4,
- .handle_mmio = handle_cpu_mmio_misc,
+ .handle_mmio = handle_mmio_abpr,
},
{
.base = GIC_CPU_ACTIVEPRIO,
.len = 16,
- .handle_mmio = handle_cpu_mmio_misc,
+ .handle_mmio = handle_mmio_raz_wi,
},
{
.base = GIC_CPU_IDENT,
.len = 4,
- .handle_mmio = handle_cpu_mmio_misc,
+ .handle_mmio = handle_cpu_mmio_ident,
},
};