This commit defines the API headers for guest debugging. There are two
architecture specific debug structures:
- kvm_guest_debug_arch, allows us to pass in HW debug registers
- kvm_debug_exit_arch, signals exception and possible faulting address
The type of debugging being used is controlled by the architecture
specific control bits of the kvm_guest_debug->control flags in the ioctl
structure.
Signed-off-by: Alex Bennée <alex.bennee@xxxxxxxxxx>
Reviewed-by: David Hildenbrand <dahi@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Andrew Jones <drjones@xxxxxxxxxx>
Acked-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
---
v2
- expose hsr and pc directly to user-space
v3
- s/control/controlled/ in commit message
- add v8 to ARM ARM comment (ARM Architecture Reference Manual)
- add rb tag
- rm pc, add far
- re-word comments on alignment
- rename KVM_ARM_NDBG_REGS -> KVM_ARM_MAX_DBG_REGS
v4
- now uses common HW/SW BP define
- add a-b-tag
- use u32 for control regs
diff --git a/arch/arm64/include/uapi/asm/kvm.h b/arch/arm64/include/uapi/asm/kvm.h
index d268320..8796610 100644
--- a/arch/arm64/include/uapi/asm/kvm.h
+++ b/arch/arm64/include/uapi/asm/kvm.h
@@ -100,10 +100,28 @@ struct kvm_sregs {
struct kvm_fpu {
};
+/*
+ * See v8 ARM ARM D7.3: Debug Registers
+ *
+ * The control registers are architecturally defined as 32 bits but are
+ * stored as 64 bit values alongside the value registers. This is done
+ * to keep the copying of these values into the vcpu context simple as
+ * everything is 64 bit aligned (see DBGBCR0_EL1 onwards in kvm_asm.h).
+ *
+ * The architectural limit is 16 debug registers of each type although
+ * in practice there are usually less (see ID_AA64DFR0_EL1).
+ */
+#define KVM_ARM_MAX_DBG_REGS 16
struct kvm_guest_debug_arch {
+ __u32 dbg_bcr[KVM_ARM_MAX_DBG_REGS];
+ __u64 dbg_bvr[KVM_ARM_MAX_DBG_REGS];
+ __u32 dbg_wcr[KVM_ARM_MAX_DBG_REGS];
+ __u64 dbg_wvr[KVM_ARM_MAX_DBG_REGS];
};
struct kvm_debug_exit_arch {
+ __u32 hsr;
+ __u64 far;
};
struct kvm_sync_regs {
--
2.3.5
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